Let a node agent hear the creation of the seat's placement and candidates, so it binds them with no timer (ADR 0567 §9, issue 1126)

The applying path (frombus.Compose) composed with no culprit, so one module's
refusal came back as the whole node's: novox's apply would have refused all its
modules for de-spiegel's unset route names. composeEach is now the one rule
Compose and Answer both follow:
- a module whose stub changes the refusal is held (compose.Node.Held); in the
  applying path a stand-in for a module placed here holds that module; only a
  refusal of no single module refuses the node;
- a held module is composed from what runs of it (compose.Carried of its own
  composition in Running) and carried in the node's own wherever that runs it,
  folded or leaving the fold, so the node's own apply never removes it (issue
  1945 by a new path) and what the others read of it is what runs;
- none of a held module's own composition is in what is applied;
- a module whose composition differs when the held ones are composed as stubs
  is held too; the node's own differing refuses the node;
- since a held module is composed from its new manifest, what reads that
  manifest is held with it: the providers of what it contributes to (the
  proxy its routes) and, when it listens, the filter's holder.

Quick fix weighed: a culprit loop in Compose alone. Thorough, chosen: one
shared function, since the kind met twice (seed-8 shadow, now the apply), and
review rounds 1 and 2 found its leaks.

go/buildstep/askrun.go

@@ -200,6 +200,9 @@ func (s AskSteps) level(ctx context.Context, job delivery.CheckJob, level string
 		if runner != "" {
 			args["runner"] = runner
 		}
+		if len(job.NodeNames) > 0 {
+			args[delivery.NodeNamesArg] = job.NodeNames // the names check's (ADR 0567 §12)
+		}
 		return args
 	}
 	test := func(args map[string]any) (bool, error) {

go/buildstep/askrun_test.go

@@ -143,6 +143,15 @@ test {"level":"unit","packages":["x/pkg/a"],"workspace":"/w"}`
 		t.Fatalf("the unit level %+v", u)
 	}
 
+	// ADR 0567 §12: a check's node names reach the digest and test tools, for the names check (a kept verdict misses when
+	// they change).
+	r.calls = nil
+	if _, err := RunAsk(context.Background(), r.steps(), ask(delivery.CheckJob{Levels: []string{delivery.LevelUnit}, NodeNames: []string{"anchor"},
+		Fetch: map[string]any{"repository": "novox/x", "commit": runCommit}})); err != nil || !strings.Contains(strings.Join(r.calls, "\n"), `digest {"level":"unit","node-names":["anchor"]`) ||
+		!strings.Contains(strings.Join(r.calls, "\n"), `test {"level":"unit","node-names":["anchor"]`) {
+		t.Fatalf("the node names are not handed to the digest and test tools: %v, %v", r.calls, err)
+	}
+
 	// Issue 890/AC2: a package declaring node-build-node is not tested on a node that lacks it but named unmet, and is
 	// tested on a node that has it.
 	for _, has := range []bool{false, true} {

go/buildstep/buildhours.go

@@ -8,14 +8,15 @@ import (
 	"time"
 )
 
-// **A node may build only within its build hours** (the operator, 2026-10-26 21:18: "we should only use g14 as a builder
-// outside office hours", "from 18 o'clock until 6 in the morning"). A build module's `build-hours` setting names, per
-// node, the window in the node's local time in which it takes asks; outside it the capacity judged by is 0: steps running
-// finish, no new one is taken. A node it does not name, or an empty setting, builds at any hour. The puller judges it at
-// every judgement and wakes on one timer to the window's next edge (a clock edge, not a poll of another part).
+// **A node may build only within its build hours** (the operator, 2026-10-26 21:18: the laptop builds only outside
+// office hours, "from 18 o'clock until 6 in the morning"). A build module's `build-hours` setting is the node's window
+// in its local time, a config value set on each node's layer of mesh-config (ADR 0567 §12: no repository names a node);
+// outside it the capacity judged by is 0: steps running finish, no new one is taken. An empty value builds at any hour.
+// The puller judges it at every judgement and wakes on one timer to the window's next edge (a clock edge, not a poll of
+// another part).
 
-// BuildHoursSetting is the build modules' setting of the nodes' build windows: `<node>=HH:MM-HH:MM` pairs separated by
-// commas, in the node's local time; an end before its start crosses midnight (g14=18:00-06:00).
+// BuildHoursSetting is the build modules' setting of the node's build window: HH:MM-HH:MM in the node's local time; an
+// end before its start crosses midnight (18:00-06:00).
 const BuildHoursSetting = "build-hours"
 
 // BuildWindow is one node's build hours: minutes after local midnight, Start inclusive, End exclusive.
@@ -51,35 +52,28 @@ func (w BuildWindow) NextEdge(t time.Time) time.Time {
 	return next
 }
 
-// ParseBuildHours is node's window in a build-hours setting: nil when the setting is empty or does not name the node.
-func ParseBuildHours(setting, node string) (*BuildWindow, error) {
-	var found *BuildWindow
-	for _, pair := range strings.Split(setting, ",") {
-		pair = strings.TrimSpace(pair)
-		if pair == "" {
-			continue
-		}
-		name, span, ok := strings.Cut(pair, "=")
-		from, to, ok2 := strings.Cut(span, "-")
-		if !ok || !ok2 || strings.TrimSpace(name) == "" {
-			return nil, fmt.Errorf("the build hours %q: %q is not <node>=HH:MM-HH:MM", setting, pair)
-		}
-		start, err := minuteOf(from)
-		if err != nil {
-			return nil, fmt.Errorf("the build hours %q: %v", setting, err)
-		}
-		end, err := minuteOf(to)
-		if err != nil {
-			return nil, fmt.Errorf("the build hours %q: %v", setting, err)
-		}
-		if start == end {
-			return nil, fmt.Errorf("the build hours %q: %s opens and closes at the same minute", setting, pair)
-		}
-		if strings.TrimSpace(name) == node {
-			found = &BuildWindow{Start: start, End: end}
-		}
+// ParseBuildWindow reads a build-hours value, HH:MM-HH:MM: nil when it is empty.
+func ParseBuildWindow(setting string) (*BuildWindow, error) {
+	setting = strings.TrimSpace(setting)
+	if setting == "" {
+		return nil, nil
 	}
-	return found, nil
+	from, to, ok := strings.Cut(setting, "-")
+	if !ok {
+		return nil, fmt.Errorf("the build hours %q are not HH:MM-HH:MM", setting)
+	}
+	start, err := minuteOf(from)
+	if err != nil {
+		return nil, fmt.Errorf("the build hours %q: %v", setting, err)
+	}
+	end, err := minuteOf(to)
+	if err != nil {
+		return nil, fmt.Errorf("the build hours %q: %v", setting, err)
+	}
+	if start == end {
+		return nil, fmt.Errorf("the build hours %q open and close at the same minute", setting)
+	}
+	return &BuildWindow{Start: start, End: end}, nil
 }
 
 // minuteOf reads HH:MM as minutes after midnight.
@@ -92,7 +86,7 @@ func minuteOf(s string) (int, error) {
 	return h*60 + m, nil
 }
 
-// NodeBuildHours is node's build window, read from the module's settings file at path at every call, and why it is
+// NodeBuildHours is the node's build window, read from the module's settings file at path at every call, and why it is
 // none when the value cannot be read. No path, no file value or an empty one is no window and no fault. A value that
 // cannot be read is no window too, so the node builds at any hour; the setting is a preference of hours, not a safety
 // bound (a node that must never build has capacity 0). It is loud: the fault is said once per distinct fault through
@@ -125,7 +119,7 @@ func NodeBuildHours(path, node string, logf func(string, ...any)) func() (*Build
 		if v, ok := s[BuildHoursSetting]; ok && json.Unmarshal(v, &setting) != nil {
 			return fault(fmt.Sprintf("the setting %s %s is not a string", BuildHoursSetting, v))
 		}
-		w, err := ParseBuildHours(setting, node)
+		w, err := ParseBuildWindow(setting)
 		if err != nil {
 			return fault(err.Error())
 		}

go/buildstep/capacity.go

@@ -4,45 +4,38 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
-
-	"git.novox.be/novox/mesh-sdk/go/delivery/buildrun"
 )
 
-// CapacitySetting is the build modules' setting of each node's build capacity (novox/hq ADR 0525 §5): `<node>=<asks at
-// once>` pairs separated by commas, as the builder's was (ADR 0485 §1). Each build module declares it with
-// DefaultCapacities as its default, and the controller lays it into the module's settings file.
+// CapacitySetting is the build modules' setting of the node's build capacity (novox/hq ADR 0525 §5, ADR 0567 §12): how
+// many asks the node takes at once, an integer config value set on each node's layer of mesh-config. No repository names
+// a node: each build module declares it with the default 0, which pulls nothing, and the controller (or mesh-config)
+// lays the node's value into the module's settings file.
 const CapacitySetting = "capacity"
 
-// DefaultCapacities is the setting's default, the builder's before R4g: the control-node (novox) and the laptop (g14)
-// build nothing.
-const DefaultCapacities = "shanks=3,ace=2,g14=0,novox=0"
-
-// NodeCapacity is node's build capacity, read from the module's settings file at path at every call, so a change takes
-// effect at the next pull; with no path it reads fallback. A node the setting does not name runs one ask at a time (as
-// the builder's did). A file or a setting that cannot be read gives 0 and says why: pulling on a setting nobody can read
-// could build on a node that must not.
-func NodeCapacity(path, fallback, node string, logf func(string, ...any)) func() int {
+// NodeCapacity is the node's build capacity, read from the module's settings file at path at every call, so a change
+// takes effect at the next pull. No path, no file value, or a value that is not a whole number of at least 0 gives 0 and
+// a value that cannot be read says why: pulling on a setting nobody can read could build on a node that must not.
+func NodeCapacity(path, node string, logf func(string, ...any)) func() int {
 	say := func(format string, args ...any) {
 		if logf != nil {
 			logf(format, args...)
 		}
 	}
 	return func() int {
-		setting := fallback
-		if path != "" {
-			raw, err := os.ReadFile(path)
-			if err != nil {
-				say("the build capacity cannot be read, so %s pulls nothing: %v", node, err)
-				return 0
-			}
-			var s map[string]any
-			if err := json.Unmarshal(raw, &s); err != nil {
-				say("the settings file %s is not JSON, so %s pulls nothing: %v", path, node, err)
-				return 0
-			}
-			setting, _ = s[CapacitySetting].(string)
+		if path == "" {
+			return 0
 		}
-		n, err := capacityOf(setting, node)
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			say("the build capacity cannot be read, so %s pulls nothing: %v", node, err)
+			return 0
+		}
+		var s map[string]json.RawMessage
+		if err := json.Unmarshal(raw, &s); err != nil {
+			say("the settings file %s is not JSON, so %s pulls nothing: %v", path, node, err)
+			return 0
+		}
+		n, err := capacityOf(s[CapacitySetting])
 		if err != nil {
 			say("%v, so %s pulls nothing", err, node)
 			return 0
@@ -51,11 +44,15 @@ func NodeCapacity(path, fallback, node string, logf func(string, ...any)) func()
 	}
 }
 
-// capacityOf is node's capacity in a setting's `<node>=<asks>` pairs: DefaultCapacity for a node it does not name.
-func capacityOf(setting, node string) (int, error) {
-	caps, err := buildrun.ParseCapacity(setting)
-	if err != nil {
-		return 0, fmt.Errorf("the build capacity: %w", err)
+// capacityOf is the capacity a config value holds: absent or null is 0; anything but a whole number of at least 0 is
+// refused, naming it.
+func capacityOf(value json.RawMessage) (int, error) {
+	if len(value) == 0 || string(value) == "null" {
+		return 0, nil
 	}
-	return (&buildrun.Places{Capacity: caps}).CapacityOf(node), nil
+	var n int
+	if err := json.Unmarshal(value, &n); err != nil || n < 0 {
+		return 0, fmt.Errorf("the build capacity %s is not a whole number of asks at once, 0 or more", value)
+	}
+	return n, nil
 }

go/buildstep/capacity_cpu.go

@@ -14,7 +14,7 @@ import (
 )
 
 // **A build seat's capacity follows the CPU its node gives builds** (issue 1806's follow-up; issue 1890, 2026-10-26
-// 19:41: under the 50 % cap shanks' mesh-build-go kept capacity 3, three full mesh-catalog checks shared 12 cores, and
+// 19:41: under the 50 % cap the workstation's mesh-build-go kept capacity 3, three full mesh-catalog checks shared 12 cores, and
 // each step ran past the 30-minute step bound with no test run). The configured capacity is an upper bound; the node's
 // build slice bounds it again by the cores a step needs: floor(the slice's quota in cores / cores-per-step), one at
 // least. The quota is read live from the cgroup at every judgement, so a changed cap is followed at the next take
@@ -27,7 +27,7 @@ import (
 const CoresPerStepSetting = "cores-per-step"
 
 // DefaultCoresPerStep are the build modules' defaults by language, from measured steps (2026-10-26): a full mesh-catalog
-// check on mesh-build-go takes what it is given (three at once took 965 % of shanks' 1200 % slice, about 4 cores each,
+// check on mesh-build-go takes what it is given (three at once took 965 % of the workstation's 1200 % slice, about 4 cores each,
 // and ran past the 30-minute step bound), so a Go step is given 6, half again what starved; a Node step (tsc, esbuild, a
 // test runner: median 15 s) and an image build (buildah, its RUN lines mostly fetches) need 2.
 var DefaultCoresPerStep = map[string]float64{delivery.AskGo: 6, delivery.AskNode: 2, delivery.AskImage: 2}

go/buildstep/capacity_test.go

@@ -10,39 +10,26 @@ import (
 
 // 1887/A7: the node's build capacity is the build module's setting, read at every pull: the control-node at 0 pulls
 // nothing, a change takes effect at the next read, and a setting that cannot be read pulls nothing.
-func TestNodeCapacity(t *testing.T) {
-	if got := NodeCapacity("", DefaultCapacities, "novox", nil)(); got != 0 {
-		t.Errorf("novox = %d by default, want 0", got)
-	}
-	if got := NodeCapacity("", DefaultCapacities, "shanks", nil)(); got != 3 {
-		t.Errorf("shanks = %d by default, want 3", got)
-	}
-	file := filepath.Join(t.TempDir(), "settings.json")
-	os.WriteFile(file, []byte(`{"capacity":"shanks=1,ace=2"}`), 0o600)
-	capacity := NodeCapacity(file, DefaultCapacities, "shanks", nil)
-	if got := capacity(); got != 1 {
-		t.Errorf("shanks = %d from the file, want 1", got)
-	}
-	os.WriteFile(file, []byte(`{"capacity":"shanks=4"}`), 0o600)
-	if got := capacity(); got != 4 {
-		t.Errorf("shanks = %d after the change, want 4", got)
-	}
-	if got := NodeCapacity(file, "", "pi", nil)(); got != 1 {
-		t.Errorf("a node not named = %d, want 1", got)
-	}
-	os.WriteFile(file, []byte(`{"capacity":"shanks=lots"}`), 0o600)
-	if got := capacity(); got != 0 {
-		t.Errorf("an unreadable setting = %d, want 0", got)
-	}
-	if got := NodeCapacity(filepath.Join(t.TempDir(), "none"), DefaultCapacities, "shanks", nil)(); got != 0 {
-		t.Errorf("a missing file = %d, want 0", got)
-	}
-}
-
 // ADR 0553 §4: a step's threads are the composer's share over the module's own capacity; without the word, none. And
 // issue 1806's follow-up: the capacity judged by is the configured one bounded by the build slice's cores over the cores
 // a step needs (the three build nodes as they stand on 2026-10-26), and cores-per-step is read from the settings file.
-func TestNodeLimitsAndTheCPUBound(t *testing.T) {
+func TestNodeCapacityAndLimits(t *testing.T) {
+	// ADR 0567 §12: the capacity is the node's integer, its default 0, and no default names a node.
+	if got := NodeCapacity("", "laptop", nil)(); got != 0 {
+		t.Errorf("no settings file = %d, want 0", got)
+	}
+	file := filepath.Join(t.TempDir(), "settings.json")
+	capacity := NodeCapacity(file, "anchor", nil)
+	for value, want := range map[string]int{`{"capacity":1}`: 1, `{"capacity":4}`: 4, `{}`: 0, `{"capacity":null}`: 0,
+		`{"capacity":"anchor=3"}`: 0, `{"capacity":-1}`: 0, `{"capacity":1.5}`: 0} {
+		os.WriteFile(file, []byte(value), 0o600)
+		if got := capacity(); got != want {
+			t.Errorf("%s = %d, want %d", value, got, want)
+		}
+	}
+	if got := NodeCapacity(filepath.Join(t.TempDir(), "none"), "anchor", nil)(); got != 0 {
+		t.Errorf("a missing file = %d, want 0", got)
+	}
 	t.Setenv("MESH_BUILD_CPU_SHARE", "")
 	if l := NodeLimits(3); l.Threads != 0 || l.Slots != 3 {
 		t.Errorf("without the word: %+v", l)
@@ -71,13 +58,13 @@ func TestNodeLimitsAndTheCPUBound(t *testing.T) {
 			t.Errorf("%s: %+v, want effective %d, by CPU %d", c.name, got, c.effective, c.byCPU)
 		}
 	}
-	file := filepath.Join(t.TempDir(), "settings.json")
+	file = filepath.Join(t.TempDir(), "settings.json")
 	var said []string
 	cores := NodeCoresPerStep(file, 6, func(f string, a ...any) { said = append(said, f) })
 	for _, c := range []struct {
 		file string
 		want float64
-	}{{`{"capacity":"shanks=2"}`, 6}, {`{"cores-per-step":4}`, 4}, {`{"cores-per-step":"3.5"}`, 3.5}, {`{"cores-per-step":0}`, 6}, {`{"cores-per-step":0}`, 6}} {
+	}{{`{"capacity":2}`, 6}, {`{"cores-per-step":4}`, 4}, {`{"cores-per-step":"3.5"}`, 3.5}, {`{"cores-per-step":0}`, 6}, {`{"cores-per-step":0}`, 6}} {
 		os.WriteFile(file, []byte(c.file), 0o600)
 		if got := cores(); got != c.want {
 			t.Errorf("cores-per-step from %s = %g, want %g", c.file, got, c.want)
@@ -89,6 +76,8 @@ func TestNodeLimitsAndTheCPUBound(t *testing.T) {
 
 	// The operator, 2026-10-26 21:18: g14 builds only from 18:00 to 06:00, its local time. Outside its build hours the
 	// capacity judged by is 0, said with the window and when it opens; a node not named, or a bad value, builds at any hour.
+	// And a node its module proves cannot build (ace without /dev/net/tun, 2026-10-28) judges by 0 at every hour, saying
+	// why, so its asks go to a node that can.
 	cet := time.FixedZone("CET", 3600)
 	day := func(hh, mm int) time.Time { return time.Date(2026, 10, 26, hh, mm, 0, 0, cet) }
 	was := now
@@ -99,17 +88,21 @@ func TestNodeLimitsAndTheCPUBound(t *testing.T) {
 		effective           int
 		edge                string // the window's next edge, HH:MM; "" for no window
 		bad                 bool
+		ineligible          string // what the module's Eligible says; "" for eligible
 	}{
-		{"g14 in the office", "g14=18:00-06:00", "g14", day(10, 0), 0, "18:00", false},
-		{"g14 in the evening", "g14=18:00-06:00", "g14", day(18, 0), 2, "06:00", false},
-		{"g14 past midnight", "g14=18:00-06:00", "g14", day(5, 59), 2, "06:00", false},
-		{"g14 at the close", "g14=18:00-06:00", "g14", day(6, 0), 0, "18:00", false},
-		{"a day window", "shanks=09:00-17:30,g14=18:00-06:00", "shanks", day(17, 29), 2, "17:30", false},
-		{"a node not named", "g14=18:00-06:00", "ace", day(10, 0), 2, "", false},
-		{"a bad time", "g14=18:00-6", "g14", day(10, 0), 2, "", true},
-		{"no span", "g14=18:00-18:00", "g14", day(10, 0), 2, "", true},
+		{"the laptop in the office", "18:00-06:00", "laptop", day(10, 0), 0, "18:00", false, ""},
+		{"the laptop in the evening", "18:00-06:00", "laptop", day(18, 0), 2, "06:00", false, ""},
+		{"the laptop past midnight", "18:00-06:00", "laptop", day(5, 59), 2, "06:00", false, ""},
+		{"the laptop at the close", "18:00-06:00", "laptop", day(6, 0), 0, "18:00", false, ""},
+		{"a day window", "09:00-17:30", "anchor", day(17, 29), 2, "17:30", false, ""},
+		{"no window", "", "anchor", day(10, 0), 2, "", false, ""},
+		{"a bad time", "18:00-6", "laptop", day(10, 0), 2, "", true, ""},
+		{"no span", "18:00-18:00", "laptop", day(10, 0), 2, "", true, ""},
+		{"the old form naming a node", "laptop=18:00-06:00", "laptop", day(10, 0), 2, "", true, ""},
+		{"a node without /dev/net/tun", "", "anchor", day(10, 0), 0, "", false, "/dev/net/tun cannot be opened: no such device"},
+		{"not eligible within its hours", "18:00-06:00", "laptop", day(19, 0), 0, "06:00", false, "/dev/net/tun cannot be opened: no such device"},
 	} {
-		w, err := ParseBuildHours(c.setting, c.node)
+		w, err := ParseBuildWindow(c.setting)
 		if (err != nil) != c.bad {
 			t.Errorf("%s: parse %v", c.name, err)
 		}
@@ -124,11 +117,16 @@ func TestNodeLimitsAndTheCPUBound(t *testing.T) {
 		file := filepath.Join(t.TempDir(), "settings.json")
 		os.WriteFile(file, []byte(`{"build-hours":"`+c.setting+`"}`), 0o600)
 		now = func() time.Time { return c.at }
-		p := &Puller{Language: "go", Node: c.node, Capacity: func() int { return 2 }, BuildHours: NodeBuildHours(file, c.node, nil)}
+		p := &Puller{Language: "go", Node: c.node, Capacity: func() int { return 2 }, BuildHours: NodeBuildHours(file, c.node, nil),
+			Eligible: func() string { return c.ineligible }}
 		got := p.CapacityDetail()
-		if got.Effective != c.effective || got.OutsideHours != (c.effective == 0) || (c.effective == 0 && !strings.Contains(got.Why, "outside its build hours 18:00-06:00 CET until 18:00")) {
+		outside := c.effective == 0 && c.ineligible == ""
+		if got.Effective != c.effective || got.OutsideHours != outside || (outside && !strings.Contains(got.Why, "outside its build hours 18:00-06:00 CET until 18:00")) {
 			t.Errorf("%s: %+v, want capacity %d", c.name, got, c.effective)
 		}
+		if got.Ineligible != c.ineligible || (c.ineligible != "" && !strings.HasPrefix(got.Why, "0, not eligible: "+c.ineligible+" (otherwise ")) {
+			t.Errorf("%s: not eligible is not said: %+v", c.name, got)
+		}
 		// A value that cannot be read builds at any hour, loudly: the record names the value and says why.
 		if c.bad && (!strings.Contains(got.BuildHoursFault, c.setting) || !strings.Contains(got.Why, "at any hour, because its build hours cannot be read")) {
 			t.Errorf("%s: a bad value is not said in the record: %+v", c.name, got)

go/buildstep/conformance/captured/README.md

@@ -0,0 +1,73 @@
+# The conformance kit's captured runner output
+
+Every file here is the real output of a test runner, never written by hand (issue 1901: a fixture that agrees with the
+mistake proves the mistake). The toolchains are the build nodes' own, as `mesh-build-go.build_go_toolchains` and
+`mesh-build-node.build_node_toolchains` reported them on 2026-10-26: go1.27.3-X:nodwarf5 on every build node, node
+v26.12.1 (npm 12.2.1) on shanks, novox and g14, and typescript 5.9.3 from mesh-build-node's toolchain/package.json.
+To capture a case again, make its tiny project in a fresh directory as below and run the command shown; the kit's case
+table (conformance.go) says what each failure must say.
+
+## go/ — `go test -json`
+
+- `passfirst.jsonl` and `subtests.jsonl` (2026-10-26, go1.27.3-X:nodwarf5, for issue 1901's thorough fix): in
+  `/tmp/1901k/go/<case>`, `GOTOOLCHAIN=local GOFLAGS=-mod=mod go test -json -count=1 ./... > ../<case>.jsonl 2>&1`.
+  - passfirst: module `example.com/passfirst`, `go 1.26`. Package `a` has `TestTheFirstPackagePasses` (empty). Package `b`
+    has `TestTheSecondPackagePassesFirst` (empty) and `TestTheSecondPackageFails`, which calls
+    `t.Logf("judged against the seat as it stands")` then `t.Fatalf("the seat has 2 holders, want 1")`: a passing package
+    and a passing test before the failing one.
+  - subtests: module `example.com/subtests`; `TestTheTable` runs `t.Run("passes", func(t *testing.T) {})` and
+    `t.Run("fails", func(t *testing.T) { t.Errorf("got 3 machines, want 4") })`: the parent fails only by its subtest.
+- `subpanic.jsonl` (2026-10-26, go1.27.3-X:nodwarf5, review round 1 of issue 1901's fix), the same way: module
+  `example.com/subpanic`; `TestTable` runs `t.Run("passes", func(t *testing.T) {})` and `t.Run("panics", ...)`, which
+  writes to a nil map. go test -json files the subtest's panic under the parent `TestTable`.
+- `logthenfatal.jsonl`, `panicking`, `timeout`, `deeptimeout`, `buildfail`, `exiting`, `killed`, `passthenfail`,
+  `mainexit`, `race`, `racemain` were captured for issue 1901's first and third meetings (2026-10-23 and 2026-10-25,
+  go1.27.3) in mesh-catalog's mesh-build-go (`testdata/captured/go-test-json-*.jsonl`, named there `go-test-json-pkg-<case>`
+  and `go-test-json-log-then-fatal`) and moved here unchanged. From that README: each is the standard output and error of
+  `go test -json -count=1 ./...` (the timeouts with `-timeout 2s`; race and racemain with `-race`, CGO_ENABLED=1) in a
+  throwaway one-file module that fails without a test's own assertion: panicking (a nil map write in TestPanics), timeout
+  (TestWaitsForever sleeps past the timeout), deeptimeout (two parallel tests and sixty blocked goroutines past the
+  timeout, so the goroutine dump pushes the panic line out of the last 4 KB), buildfail (a type error in a test file),
+  exiting (os.Exit(3) in TestExits), killed (TestKilled sends itself SIGKILL), passthenfail (TestMain panics in a
+  goroutine after m.Run passed), mainexit (TestMain exits 2 after m.Run passed: go test prints "PASS" and then
+  "FAIL <pkg>"), race (TestRacesOnTheSeat writes a package variable from itself and a goroutine), racemain (TestMain does
+  so after m.Run passed). logthenfatal is a test `TestThree` in package `x` that logs a line with t.Logf and then fails
+  with a multi-line t.Fatalf naming three subscriptions.
+
+## node/ — `npm test` running `node --test` under the TAP reporter
+
+Captured 2026-10-26 with node v26.12.1 and npm 12.2.1 (`/usr/bin/node`, `/usr/bin/npm`), in `/tmp/1901k/node/<case>`, the
+way mesh-build-node runs a test script:
+
+    PATH=/usr/bin:$PATH NODE_OPTIONS="--test-reporter=tap --test-reporter-destination=/tmp/1901k/node/<case>.tap" \
+      npm test > ../<case>.stdout 2> ../<case>.stderr
+
+`<case>.tap` is the report file, `<case>.console` the stdout followed by the stderr. Each project's package.json is
+`{"name":"<case>","private":true,"type":"module","scripts":{"test":"node --test --experimental-strip-types 'test/*.test.ts'"}}`
+(the script every TypeScript package of the catalogue and the SDK runs), with these test files:
+
+- two-files: `test/a.test.ts` holds `test('passes in the first file', () => {})`; `test/b.test.ts` holds
+  `test('passes in the second file first', () => {})` and `test('fails in the second file', ...)`, which logs
+  `judged against the seat as it stands` and asserts `assert.strictEqual(1 + 1, 3, 'one plus one is not three')`.
+- suite: `test/a.test.ts` has `describe('the seat', ...)` with `it('passes inside', () => {})` and `it('fails inside', ...)`
+  asserting `assert.deepStrictEqual({ holders: 2 }, { holders: 1 })`.
+- crash: `test/a.test.ts` holds `test('passes before the crash', () => {})`; `test/b.test.ts` holds
+  `test('throws after it returned', ...)`, which throws `new Error('the bus closed under the test')` in a `setTimeout` of
+  1 ms, and `test('waits after the throw', ...)`, which waits 50 ms: node fails the file with an uncaught exception.
+- logcrash (review round 1): `test/a.test.ts` holds `test('passes and logs', ...)`, which logs
+  `retrying after Error: the store was not ready yet`; `test/b.test.ts` is crash's. A passing test's console line
+  holding "Error" comes before the crash's own.
+- timeout: `test/a.test.ts` holds `test('passes before the wait', () => {})` and
+  `test('waits for an answer that never comes', { timeout: 200 }, async () => { await new Promise(() => {}); })`.
+- syntax: `test/a.test.ts` holds `test('passes in the first file', () => {})`; `test/b.test.ts` is
+  `import test from 'node:test';` and `test('never loads', () => {` (cut off): the file does not load.
+
+## tsc/ — the type-check
+
+`typeerror.console` (2026-10-26, typescript 5.9.3 under node v26.12.1): in `/tmp/1901k/tsc/typeerror`, `ok.ts` is
+`export const holders: number = 1;` and `seat.ts` is `import { holders } from './ok.js'; export const name: string = holders;`;
+the command is mesh-build-node's type-check line without a tsconfig.json:
+
+    node <typescript>/bin/tsc --noEmit --module NodeNext --moduleResolution NodeNext --target ES2022 --rootDir . ok.ts seat.ts
+
+and the file is its stdout followed by its stderr.

go/buildstep/conformance/captured/go/buildfail.jsonl

@@ -0,0 +1,6 @@
+{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-output","Output":"# example.com/buildfail [example.com/buildfail.test]\n"}
+{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-output","Output":"./p_test.go:5:40: cannot use \"seat\" (untyped string constant) as int value in variable declaration\n"}
+{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-fail"}
+{"Time":"2026-10-25T15:34:33.261137737+01:00","Action":"start","Package":"example.com/buildfail"}
+{"Time":"2026-10-25T15:34:33.261255019+01:00","Action":"output","Package":"example.com/buildfail","Output":"FAIL\texample.com/buildfail [build failed]\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.261268099+01:00","Action":"fail","Package":"example.com/buildfail","Elapsed":0,"FailedBuild":"example.com/buildfail [example.com/buildfail.test]"}

go/buildstep/conformance/captured/go/deeptimeout.jsonl

@@ -0,0 +1,417 @@
+{"Time":"2026-10-25T15:35:18.991630993+01:00","Action":"start","Package":"example.com/deeptimeout"}
+{"Time":"2026-10-25T15:35:18.993895188+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.993963909+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== RUN   TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99399484+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== PAUSE TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.9939982+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.99400173+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.99400456+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== RUN   TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99400838+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== PAUSE TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99401133+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.99401441+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.99401704+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== CONT  TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.994074141+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.994102612+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== CONT  TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:21.00935195+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"panic: test timed out after 2s\n"}
+{"Time":"2026-10-25T15:35:21.00938383+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\trunning tests:\n"}
+{"Time":"2026-10-25T15:35:21.009394391+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestHoldsTheSeat (2s)\n"}
+{"Time":"2026-10-25T15:35:21.009398021+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestWaitsForTheBus (2s)\n"}
+{"Time":"2026-10-25T15:35:21.009401801+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009406481+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 81 [running]:\n"}
+{"Time":"2026-10-25T15:35:21.009409911+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.(*M).startAlarm.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009413361+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2961 +0x34a\n"}
+{"Time":"2026-10-25T15:35:21.009418341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by time.goFunc\n"}
+{"Time":"2026-10-25T15:35:21.009421781+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/time/sleep.go:182 +0x2d\n"}
+{"Time":"2026-10-25T15:35:21.009424991+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009428341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 1 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009431721+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009441811+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2144 +0x425\n"}
+{"Time":"2026-10-25T15:35:21.009445511+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702008, 0x282e9646bc8)\n"}
+{"Time":"2026-10-25T15:35:21.009449641+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2201 +0x123\n"}
+{"Time":"2026-10-25T15:35:21.009453471+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.runTests({0x55a45d, 0x17}, {0x55a45d, 0x17}, 0x282e95940f0, {0x6f19f0, 0x2, 0x2}, {0xc2afa2ca3b3c0c8d, 0x7737f168, ...})\n"}
+{"Time":"2026-10-25T15:35:21.009462092+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2742 +0x510\n"}
+{"Time":"2026-10-25T15:35:21.009467222+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.(*M).Run(0x282e96581e0)\n"}
+{"Time":"2026-10-25T15:35:21.009470662+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2602 +0x6af\n"}
+{"Time":"2026-10-25T15:35:21.009473692+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"main.main()\n"}
+{"Time":"2026-10-25T15:35:21.009476942+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t_testmain.go:48 +0x9b\n"}
+{"Time":"2026-10-25T15:35:21.009480092+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009483242+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 7 [sleep]:\n"}
+{"Time":"2026-10-25T15:35:21.009486502+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"time.Sleep(0xdf8475800)\n"}
+{"Time":"2026-10-25T15:35:21.009490682+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
+{"Time":"2026-10-25T15:35:21.009493812+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat(0x282e9702248?)\n"}
+{"Time":"2026-10-25T15:35:21.009498842+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:14 +0x9e\n"}
+{"Time":"2026-10-25T15:35:21.009502242+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702248, 0x6d5e78)\n"}
+{"Time":"2026-10-25T15:35:21.009505742+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:35:21.009509292+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by testing.(*T).Run in goroutine 1\n"}
+{"Time":"2026-10-25T15:35:21.009512752+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-25T15:35:21.009515792+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009518623+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 8 [sleep]:\n"}
+{"Time":"2026-10-25T15:35:21.009521303+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"time.Sleep(0xdf8475800)\n"}
+{"Time":"2026-10-25T15:35:21.009524423+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
+{"Time":"2026-10-25T15:35:21.009531403+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestWaitsForTheBus(0x282e9702488?)\n"}
+{"Time":"2026-10-25T15:35:21.009534943+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:19 +0x25\n"}
+{"Time":"2026-10-25T15:35:21.009538403+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702488, 0x6d5e80)\n"}
+{"Time":"2026-10-25T15:35:21.009541953+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:35:21.009545233+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by testing.(*T).Run in goroutine 1\n"}
+{"Time":"2026-10-25T15:35:21.009548323+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-25T15:35:21.009551343+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009554263+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 9 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009557523+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009561063+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.009564513+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.009571113+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.009574233+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009577433+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 10 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009580823+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009584174+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.009587504+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.009590974+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.009594004+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009597184+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 11 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009600394+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009603874+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.009610954+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.009614714+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.009618104+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009621364+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 12 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009624704+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009628324+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.009631954+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.009635404+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.009638734+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
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+{"Time":"2026-10-25T15:35:21.010892234+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010895524+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010902154+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010904984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010907984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 68 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010911064+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010914074+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010917365+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010920505+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.013209581+01:00","Action":"output","Package":"example.com/deeptimeout","Output":"FAIL\texample.com/deeptimeout\t2.021s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:21.013258851+01:00","Action":"fail","Package":"example.com/deeptimeout","Elapsed":2.022}

go/buildstep/conformance/captured/go/exiting.jsonl

@@ -0,0 +1,10 @@
+{"Time":"2026-10-25T15:34:33.768742837+01:00","Action":"start","Package":"example.com/exiting"}
+{"Time":"2026-10-25T15:34:33.773822287+01:00","Action":"run","Package":"example.com/exiting","Test":"TestFine"}
+{"Time":"2026-10-25T15:34:33.773896608+01:00","Action":"output","Package":"example.com/exiting","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.773940319+01:00","Action":"output","Package":"example.com/exiting","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.773945359+01:00","Action":"pass","Package":"example.com/exiting","Test":"TestFine","Elapsed":0}
+{"Time":"2026-10-25T15:34:33.773952529+01:00","Action":"run","Package":"example.com/exiting","Test":"TestExits"}
+{"Time":"2026-10-25T15:34:33.773956439+01:00","Action":"output","Package":"example.com/exiting","Test":"TestExits","Output":"=== RUN   TestExits\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.773959829+01:00","Action":"output","Package":"example.com/exiting","Test":"TestExits","Output":"    p_test.go:11: closing the store\n"}
+{"Time":"2026-10-25T15:34:33.775158538+01:00","Action":"output","Package":"example.com/exiting","Output":"FAIL\texample.com/exiting\t0.006s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.775186509+01:00","Action":"fail","Package":"example.com/exiting","Elapsed":0.006}

go/buildstep/conformance/captured/go/killed.jsonl

@@ -0,0 +1,7 @@
+{"Time":"2026-10-25T15:34:34.328258934+01:00","Action":"start","Package":"example.com/killed"}
+{"Time":"2026-10-25T15:34:34.331465435+01:00","Action":"run","Package":"example.com/killed","Test":"TestKilled"}
+{"Time":"2026-10-25T15:34:34.331699248+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"=== RUN   TestKilled\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.331853111+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"    p_test.go:10: the kernel is about to kill this\n"}
+{"Time":"2026-10-25T15:34:34.334563213+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"signal: killed\n"}
+{"Time":"2026-10-25T15:34:34.334611114+01:00","Action":"output","Package":"example.com/killed","Output":"FAIL\texample.com/killed\t0.006s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.334627134+01:00","Action":"fail","Package":"example.com/killed","Elapsed":0.006}

go/buildstep/conformance/captured/go/logthenfatal.jsonl

@@ -0,0 +1,13 @@
+{"Action":"start","Package":"x"}
+{"Action":"run","Package":"x","Test":"TestThree"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"=== RUN   TestThree\n","OutputType":"frame"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"    a_test.go:4: judged against /var/lib/mesh-build-go-work/id/beside/mesh-catalog as cloned\n"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"    a_test.go:5: 3 subscription(s) derive to a subject no emitter owns:\n","OutputType":"error"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"          a.b.c\n","OutputType":"error-continue"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"          d.e.f\n","OutputType":"error-continue"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"          g.h.i\n","OutputType":"error-continue"}
+{"Action":"output","Package":"x","Test":"TestThree","Output":"--- FAIL: TestThree (0.00s)\n","OutputType":"frame"}
+{"Action":"fail","Package":"x","Test":"TestThree","Elapsed":0}
+{"Action":"output","Package":"x","Output":"FAIL\n","OutputType":"frame"}
+{"Action":"output","Package":"x","Output":"FAIL\tx\t0.002s\n","OutputType":"frame"}
+{"Action":"fail","Package":"x","Elapsed":0.002}

go/buildstep/conformance/captured/go/mainexit.jsonl

@@ -0,0 +1,8 @@
+{"Time":"2026-10-25T15:34:35.274953775+01:00","Action":"start","Package":"example.com/mainexit"}
+{"Time":"2026-10-25T15:34:35.278129565+01:00","Action":"run","Package":"example.com/mainexit","Test":"TestFine"}
+{"Time":"2026-10-25T15:34:35.278191516+01:00","Action":"output","Package":"example.com/mainexit","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:35.278341979+01:00","Action":"output","Package":"example.com/mainexit","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:35.278351739+01:00","Action":"pass","Package":"example.com/mainexit","Test":"TestFine","Elapsed":0}
+{"Time":"2026-10-25T15:34:35.278359039+01:00","Action":"output","Package":"example.com/mainexit","Output":"PASS\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:35.279516487+01:00","Action":"output","Package":"example.com/mainexit","Output":"FAIL\texample.com/mainexit\t0.004s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:35.279539298+01:00","Action":"fail","Package":"example.com/mainexit","Elapsed":0.005}

go/buildstep/conformance/captured/go/panicking.jsonl

@@ -0,0 +1,27 @@
+{"Time":"2026-10-25T15:34:33.031091436+01:00","Action":"start","Package":"example.com/panicking"}
+{"Time":"2026-10-25T15:34:33.036353279+01:00","Action":"run","Package":"example.com/panicking","Test":"TestBefore"}
+{"Time":"2026-10-25T15:34:33.036441781+01:00","Action":"output","Package":"example.com/panicking","Test":"TestBefore","Output":"=== RUN   TestBefore\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.036568163+01:00","Action":"output","Package":"example.com/panicking","Test":"TestBefore","Output":"--- PASS: TestBefore (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.036609863+01:00","Action":"pass","Package":"example.com/panicking","Test":"TestBefore","Elapsed":0}
+{"Time":"2026-10-25T15:34:33.036641304+01:00","Action":"run","Package":"example.com/panicking","Test":"TestPanics"}
+{"Time":"2026-10-25T15:34:33.036645914+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"=== RUN   TestPanics\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.036698995+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"    p_test.go:8: about to look up the seat\n"}
+{"Time":"2026-10-25T15:34:33.036773996+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"--- FAIL: TestPanics (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.03897418+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"panic: assignment to entry in nil map [recovered, repanicked]\n"}
+{"Time":"2026-10-25T15:34:33.040332172+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\n"}
+{"Time":"2026-10-25T15:34:33.040414493+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"goroutine 8 [running]:\n"}
+{"Time":"2026-10-25T15:34:33.040521475+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner.func1.2({0x6b8120, 0x6eff80})\n"}
+{"Time":"2026-10-25T15:34:33.040601826+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2125 +0x232\n"}
+{"Time":"2026-10-25T15:34:33.040641947+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner.func1()\n"}
+{"Time":"2026-10-25T15:34:33.040720648+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2128 +0x329\n"}
+{"Time":"2026-10-25T15:34:33.04083286+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"panic({0x6b8120?, 0x6eff80?})\n"}
+{"Time":"2026-10-25T15:34:33.040912921+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/runtime/panic.go:859 +0x125\n"}
+{"Time":"2026-10-25T15:34:33.040981652+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"example.com/panicking.TestPanics(0x228226cd0488?)\n"}
+{"Time":"2026-10-25T15:34:33.041059903+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/tmp/fix-1901b/panicking/p_test.go:10 +0x53\n"}
+{"Time":"2026-10-25T15:34:33.041132704+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner(0x228226cd0488, 0x6d5bc8)\n"}
+{"Time":"2026-10-25T15:34:33.041215586+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:34:33.041221966+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"created by testing.(*T).Run in goroutine 1\n"}
+{"Time":"2026-10-25T15:34:33.041225556+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-25T15:34:33.041984088+01:00","Action":"fail","Package":"example.com/panicking","Test":"TestPanics","Elapsed":0}
+{"Time":"2026-10-25T15:34:33.041996638+01:00","Action":"output","Package":"example.com/panicking","Output":"FAIL\texample.com/panicking\t0.010s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:33.042044079+01:00","Action":"fail","Package":"example.com/panicking","Elapsed":0.011}

go/buildstep/conformance/captured/go/passfirst.jsonl

@@ -0,0 +1,22 @@
+{"Time":"2026-10-26T19:40:29.574068887+01:00","Action":"start","Package":"example.com/passfirst/a"}
+{"Time":"2026-10-26T19:40:29.574347185+01:00","Action":"start","Package":"example.com/passfirst/b"}
+{"Time":"2026-10-26T19:40:29.576503518+01:00","Action":"run","Package":"example.com/passfirst/a","Test":"TestTheFirstPackagePasses"}
+{"Time":"2026-10-26T19:40:29.576557657+01:00","Action":"output","Package":"example.com/passfirst/a","Test":"TestTheFirstPackagePasses","Output":"=== RUN   TestTheFirstPackagePasses\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576589367+01:00","Action":"output","Package":"example.com/passfirst/a","Test":"TestTheFirstPackagePasses","Output":"--- PASS: TestTheFirstPackagePasses (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576594637+01:00","Action":"pass","Package":"example.com/passfirst/a","Test":"TestTheFirstPackagePasses","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.576602487+01:00","Action":"output","Package":"example.com/passfirst/a","Output":"PASS\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576614477+01:00","Action":"run","Package":"example.com/passfirst/b","Test":"TestTheSecondPackagePassesFirst"}
+{"Time":"2026-10-26T19:40:29.576626897+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackagePassesFirst","Output":"=== RUN   TestTheSecondPackagePassesFirst\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576631187+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackagePassesFirst","Output":"--- PASS: TestTheSecondPackagePassesFirst (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576635567+01:00","Action":"pass","Package":"example.com/passfirst/b","Test":"TestTheSecondPackagePassesFirst","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.576638427+01:00","Action":"run","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails"}
+{"Time":"2026-10-26T19:40:29.576640647+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails","Output":"=== RUN   TestTheSecondPackageFails\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576643477+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails","Output":"    b_test.go:8: judged against the seat as it stands\n"}
+{"Time":"2026-10-26T19:40:29.576646497+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails","Output":"    b_test.go:9: the seat has 2 holders, want 1\n","OutputType":"error"}
+{"Time":"2026-10-26T19:40:29.576650087+01:00","Action":"output","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails","Output":"--- FAIL: TestTheSecondPackageFails (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.576652797+01:00","Action":"fail","Package":"example.com/passfirst/b","Test":"TestTheSecondPackageFails","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.576655177+01:00","Action":"output","Package":"example.com/passfirst/b","Output":"FAIL\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.577365541+01:00","Action":"output","Package":"example.com/passfirst/a","Output":"ok  \texample.com/passfirst/a\t0.003s\n"}
+{"Time":"2026-10-26T19:40:29.577382561+01:00","Action":"pass","Package":"example.com/passfirst/a","Elapsed":0.003}
+{"Time":"2026-10-26T19:40:29.577380641+01:00","Action":"output","Package":"example.com/passfirst/b","Output":"FAIL\texample.com/passfirst/b\t0.003s\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.5774131+01:00","Action":"fail","Package":"example.com/passfirst/b","Elapsed":0.003}

go/buildstep/conformance/captured/go/passthenfail.jsonl

@@ -0,0 +1,15 @@
+{"Time":"2026-10-25T15:34:34.919624192+01:00","Action":"start","Package":"example.com/passthenfail"}
+{"Time":"2026-10-25T15:34:34.922861224+01:00","Action":"run","Package":"example.com/passthenfail","Test":"TestFine"}
+{"Time":"2026-10-25T15:34:34.922932965+01:00","Action":"output","Package":"example.com/passthenfail","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.922969205+01:00","Action":"output","Package":"example.com/passthenfail","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.922979956+01:00","Action":"pass","Package":"example.com/passthenfail","Test":"TestFine","Elapsed":0}
+{"Time":"2026-10-25T15:34:34.922989416+01:00","Action":"output","Package":"example.com/passthenfail","Output":"PASS\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.925022528+01:00","Action":"output","Package":"example.com/passthenfail","Output":"panic: the bus closed after the tests: nats: connection closed\n"}
+{"Time":"2026-10-25T15:34:34.925043388+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\n"}
+{"Time":"2026-10-25T15:34:34.925046848+01:00","Action":"output","Package":"example.com/passthenfail","Output":"goroutine 20 [running]:\n"}
+{"Time":"2026-10-25T15:34:34.925051338+01:00","Action":"output","Package":"example.com/passthenfail","Output":"example.com/passthenfail.TestMain.func1()\n"}
+{"Time":"2026-10-25T15:34:34.925055878+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\t/tmp/fix-1901b/passthenfail/p_test.go:13 +0x25\n"}
+{"Time":"2026-10-25T15:34:34.925061428+01:00","Action":"output","Package":"example.com/passthenfail","Output":"created by example.com/passthenfail.TestMain in goroutine 1\n"}
+{"Time":"2026-10-25T15:34:34.925065028+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\t/tmp/fix-1901b/passthenfail/p_test.go:13 +0x25\n"}
+{"Time":"2026-10-25T15:34:34.925390203+01:00","Action":"output","Package":"example.com/passthenfail","Output":"FAIL\texample.com/passthenfail\t0.005s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:34.925402904+01:00","Action":"fail","Package":"example.com/passthenfail","Elapsed":0.006}

go/buildstep/conformance/captured/go/race.jsonl

@@ -0,0 +1,53 @@
+{"Time":"2026-10-25T15:50:42.908557309+01:00","Action":"start","Package":"example.com/race"}
+{"Time":"2026-10-25T15:50:42.924298679+01:00","Action":"run","Package":"example.com/race","Test":"TestBefore"}
+{"Time":"2026-10-25T15:50:42.92438195+01:00","Action":"output","Package":"example.com/race","Test":"TestBefore","Output":"=== RUN   TestBefore\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.924648842+01:00","Action":"output","Package":"example.com/race","Test":"TestBefore","Output":"--- PASS: TestBefore (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.924685133+01:00","Action":"pass","Package":"example.com/race","Test":"TestBefore","Elapsed":0}
+{"Time":"2026-10-25T15:50:42.924728573+01:00","Action":"run","Package":"example.com/race","Test":"TestRacesOnTheSeat"}
+{"Time":"2026-10-25T15:50:42.924733573+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"=== RUN   TestRacesOnTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.92637298+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"==================\n"}
+{"Time":"2026-10-25T15:50:42.92641567+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"WARNING: DATA RACE\n"}
+{"Time":"2026-10-25T15:50:42.926444061+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Write at 0x000000833468 by goroutine 10:\n"}
+{"Time":"2026-10-25T15:50:42.926462621+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:50:42.926467121+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:13 +0x24\n"}
+{"Time":"2026-10-25T15:50:42.926483061+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
+{"Time":"2026-10-25T15:50:42.926509741+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Previous write at 0x000000833468 by goroutine 9:\n"}
+{"Time":"2026-10-25T15:50:42.926530142+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat()\n"}
+{"Time":"2026-10-25T15:50:42.926534952+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:14 +0x30\n"}
+{"Time":"2026-10-25T15:50:42.926550462+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
+{"Time":"2026-10-25T15:50:42.926554612+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
+{"Time":"2026-10-25T15:50:42.926571142+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run.gowrap1()\n"}
+{"Time":"2026-10-25T15:50:42.926575812+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0x38\n"}
+{"Time":"2026-10-25T15:50:42.926592202+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
+{"Time":"2026-10-25T15:50:42.926607792+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Goroutine 10 (running) created at:\n"}
+{"Time":"2026-10-25T15:50:42.926624292+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat()\n"}
+{"Time":"2026-10-25T15:50:42.926628923+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:13 +0x24\n"}
+{"Time":"2026-10-25T15:50:42.926643853+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
+{"Time":"2026-10-25T15:50:42.926648103+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
+{"Time":"2026-10-25T15:50:42.926674843+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run.gowrap1()\n"}
+{"Time":"2026-10-25T15:50:42.926680673+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0x38\n"}
+{"Time":"2026-10-25T15:50:42.926695433+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
+{"Time":"2026-10-25T15:50:42.926711063+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Goroutine 9 (running) created at:\n"}
+{"Time":"2026-10-25T15:50:42.926726614+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run()\n"}
+{"Time":"2026-10-25T15:50:42.926730814+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0xb12\n"}
+{"Time":"2026-10-25T15:50:42.926746484+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.runTests.func1()\n"}
+{"Time":"2026-10-25T15:50:42.926750764+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2744 +0x84\n"}
+{"Time":"2026-10-25T15:50:42.926765354+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
+{"Time":"2026-10-25T15:50:42.926769844+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
+{"Time":"2026-10-25T15:50:42.926791794+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.runTests()\n"}
+{"Time":"2026-10-25T15:50:42.926796704+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2742 +0x9e9\n"}
+{"Time":"2026-10-25T15:50:42.926811544+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*M).Run()\n"}
+{"Time":"2026-10-25T15:50:42.926816694+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2602 +0xf44\n"}
+{"Time":"2026-10-25T15:50:42.926831695+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  main.main()\n"}
+{"Time":"2026-10-25T15:50:42.926835935+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      _testmain.go:50 +0x164\n"}
+{"Time":"2026-10-25T15:50:42.926850905+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"==================\n"}
+{"Time":"2026-10-25T15:50:42.935320241+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"    testing.go:1867: race detected during execution of test\n","OutputType":"error"}
+{"Time":"2026-10-25T15:50:42.935520113+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"--- FAIL: TestRacesOnTheSeat (0.01s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.935592973+01:00","Action":"fail","Package":"example.com/race","Test":"TestRacesOnTheSeat","Elapsed":0.01}
+{"Time":"2026-10-25T15:50:42.935722225+01:00","Action":"run","Package":"example.com/race","Test":"TestAfter"}
+{"Time":"2026-10-25T15:50:42.935728845+01:00","Action":"output","Package":"example.com/race","Test":"TestAfter","Output":"=== RUN   TestAfter\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.935995928+01:00","Action":"output","Package":"example.com/race","Test":"TestAfter","Output":"--- PASS: TestAfter (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.936006328+01:00","Action":"pass","Package":"example.com/race","Test":"TestAfter","Elapsed":0}
+{"Time":"2026-10-25T15:50:42.936009978+01:00","Action":"output","Package":"example.com/race","Output":"FAIL\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.937730745+01:00","Action":"output","Package":"example.com/race","Output":"FAIL\texample.com/race\t0.028s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:42.937802066+01:00","Action":"fail","Package":"example.com/race","Elapsed":0.029}

go/buildstep/conformance/captured/go/racemain.jsonl

@@ -0,0 +1,27 @@
+{"Time":"2026-10-25T15:50:43.551701745+01:00","Action":"start","Package":"example.com/racemain"}
+{"Time":"2026-10-25T15:50:43.570709708+01:00","Action":"run","Package":"example.com/racemain","Test":"TestFine"}
+{"Time":"2026-10-25T15:50:43.570806059+01:00","Action":"output","Package":"example.com/racemain","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:43.57085525+01:00","Action":"output","Package":"example.com/racemain","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:43.57086149+01:00","Action":"pass","Package":"example.com/racemain","Test":"TestFine","Elapsed":0}
+{"Time":"2026-10-25T15:50:43.57086974+01:00","Action":"output","Package":"example.com/racemain","Output":"PASS\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:43.572155623+01:00","Action":"output","Package":"example.com/racemain","Output":"==================\n"}
+{"Time":"2026-10-25T15:50:43.572168083+01:00","Action":"output","Package":"example.com/racemain","Output":"WARNING: DATA RACE\n"}
+{"Time":"2026-10-25T15:50:43.572171933+01:00","Action":"output","Package":"example.com/racemain","Output":"Write at 0x000000836428 by goroutine 9:\n"}
+{"Time":"2026-10-25T15:50:43.572176703+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain.func1()\n"}
+{"Time":"2026-10-25T15:50:43.572180053+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:15 +0x24\n"}
+{"Time":"2026-10-25T15:50:43.572184923+01:00","Action":"output","Package":"example.com/racemain","Output":"\n"}
+{"Time":"2026-10-25T15:50:43.572189613+01:00","Action":"output","Package":"example.com/racemain","Output":"Previous write at 0x000000836428 by main goroutine:\n"}
+{"Time":"2026-10-25T15:50:43.572192993+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain()\n"}
+{"Time":"2026-10-25T15:50:43.572198573+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:16 +0x44\n"}
+{"Time":"2026-10-25T15:50:43.572202433+01:00","Action":"output","Package":"example.com/racemain","Output":"  main.main()\n"}
+{"Time":"2026-10-25T15:50:43.572205623+01:00","Action":"output","Package":"example.com/racemain","Output":"      _testmain.go:48 +0x171\n"}
+{"Time":"2026-10-25T15:50:43.572208443+01:00","Action":"output","Package":"example.com/racemain","Output":"\n"}
+{"Time":"2026-10-25T15:50:43.572211573+01:00","Action":"output","Package":"example.com/racemain","Output":"Goroutine 9 (running) created at:\n"}
+{"Time":"2026-10-25T15:50:43.572214803+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain()\n"}
+{"Time":"2026-10-25T15:50:43.572218043+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:15 +0x37\n"}
+{"Time":"2026-10-25T15:50:43.572225414+01:00","Action":"output","Package":"example.com/racemain","Output":"  main.main()\n"}
+{"Time":"2026-10-25T15:50:43.572228654+01:00","Action":"output","Package":"example.com/racemain","Output":"      _testmain.go:48 +0x171\n"}
+{"Time":"2026-10-25T15:50:43.572231664+01:00","Action":"output","Package":"example.com/racemain","Output":"==================\n"}
+{"Time":"2026-10-25T15:50:44.581262249+01:00","Action":"output","Package":"example.com/racemain","Output":"Found 1 data race(s)\n"}
+{"Time":"2026-10-25T15:50:44.584693204+01:00","Action":"output","Package":"example.com/racemain","Output":"FAIL\texample.com/racemain\t1.031s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:50:44.584737425+01:00","Action":"fail","Package":"example.com/racemain","Elapsed":1.033}

go/buildstep/conformance/captured/go/subpanic.jsonl

@@ -0,0 +1,30 @@
+{"Time":"2026-10-26T20:15:37.791161045+01:00","Action":"start","Package":"example.com/subpanic"}
+{"Time":"2026-10-26T20:15:37.793205666+01:00","Action":"run","Package":"example.com/subpanic","Test":"TestTable"}
+{"Time":"2026-10-26T20:15:37.793257158+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"=== RUN   TestTable\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.793288149+01:00","Action":"run","Package":"example.com/subpanic","Test":"TestTable/passes"}
+{"Time":"2026-10-26T20:15:37.793290669+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable/passes","Output":"=== RUN   TestTable/passes\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.793298009+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable/passes","Output":"--- PASS: TestTable/passes (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.793311679+01:00","Action":"pass","Package":"example.com/subpanic","Test":"TestTable/passes","Elapsed":0}
+{"Time":"2026-10-26T20:15:37.79331977+01:00","Action":"run","Package":"example.com/subpanic","Test":"TestTable/panics"}
+{"Time":"2026-10-26T20:15:37.79332377+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable/panics","Output":"=== RUN   TestTable/panics\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.79332773+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable/panics","Output":"--- FAIL: TestTable/panics (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.79333111+01:00","Action":"fail","Package":"example.com/subpanic","Test":"TestTable/panics","Elapsed":0}
+{"Time":"2026-10-26T20:15:37.79333383+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"--- FAIL: TestTable (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.795322529+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"panic: assignment to entry in nil map [recovered, repanicked]\n"}
+{"Time":"2026-10-26T20:15:37.795331489+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\n"}
+{"Time":"2026-10-26T20:15:37.795340579+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"goroutine 9 [running]:\n"}
+{"Time":"2026-10-26T20:15:37.79534387+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"testing.tRunner.func1.2({0x6b7010, 0x6eef80})\n"}
+{"Time":"2026-10-26T20:15:37.79534657+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/usr/lib/go/src/testing/testing.go:2125 +0x232\n"}
+{"Time":"2026-10-26T20:15:37.79534907+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"testing.tRunner.func1()\n"}
+{"Time":"2026-10-26T20:15:37.79535172+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/usr/lib/go/src/testing/testing.go:2128 +0x329\n"}
+{"Time":"2026-10-26T20:15:37.79535625+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"panic({0x6b7010?, 0x6eef80?})\n"}
+{"Time":"2026-10-26T20:15:37.79535879+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/usr/lib/go/src/runtime/panic.go:859 +0x125\n"}
+{"Time":"2026-10-26T20:15:37.79536129+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"example.com/subpanic.TestTable.func2(0x3b39436666c8?)\n"}
+{"Time":"2026-10-26T20:15:37.79536452+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/tmp/1901k/go/subpanic/p_test.go:7 +0x28\n"}
+{"Time":"2026-10-26T20:15:37.79536782+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"testing.tRunner(0x3b39436666c8, 0x6d4b58)\n"}
+{"Time":"2026-10-26T20:15:37.7953704+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-26T20:15:37.79537289+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"created by testing.(*T).Run in goroutine 7\n"}
+{"Time":"2026-10-26T20:15:37.795381681+01:00","Action":"output","Package":"example.com/subpanic","Test":"TestTable","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-26T20:15:37.795731441+01:00","Action":"fail","Package":"example.com/subpanic","Test":"TestTable","Elapsed":0}
+{"Time":"2026-10-26T20:15:37.795759332+01:00","Action":"output","Package":"example.com/subpanic","Output":"FAIL\texample.com/subpanic\t0.004s\n","OutputType":"frame"}
+{"Time":"2026-10-26T20:15:37.795783503+01:00","Action":"fail","Package":"example.com/subpanic","Elapsed":0.005}

go/buildstep/conformance/captured/go/subtests.jsonl

@@ -0,0 +1,17 @@
+{"Time":"2026-10-26T19:40:29.768101399+01:00","Action":"start","Package":"example.com/subtests"}
+{"Time":"2026-10-26T19:40:29.770109733+01:00","Action":"run","Package":"example.com/subtests","Test":"TestTheTable"}
+{"Time":"2026-10-26T19:40:29.770152272+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable","Output":"=== RUN   TestTheTable\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770189372+01:00","Action":"run","Package":"example.com/subtests","Test":"TestTheTable/passes"}
+{"Time":"2026-10-26T19:40:29.770191882+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable/passes","Output":"=== RUN   TestTheTable/passes\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770197442+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable/passes","Output":"--- PASS: TestTheTable/passes (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770204352+01:00","Action":"pass","Package":"example.com/subtests","Test":"TestTheTable/passes","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.770209622+01:00","Action":"run","Package":"example.com/subtests","Test":"TestTheTable/fails"}
+{"Time":"2026-10-26T19:40:29.770211832+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable/fails","Output":"=== RUN   TestTheTable/fails\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770214722+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable/fails","Output":"    s_test.go:7: got 3 machines, want 4\n","OutputType":"error"}
+{"Time":"2026-10-26T19:40:29.770218032+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable/fails","Output":"--- FAIL: TestTheTable/fails (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770220732+01:00","Action":"fail","Package":"example.com/subtests","Test":"TestTheTable/fails","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.770223522+01:00","Action":"output","Package":"example.com/subtests","Test":"TestTheTable","Output":"--- FAIL: TestTheTable (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770226292+01:00","Action":"fail","Package":"example.com/subtests","Test":"TestTheTable","Elapsed":0}
+{"Time":"2026-10-26T19:40:29.770228582+01:00","Action":"output","Package":"example.com/subtests","Output":"FAIL\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770561979+01:00","Action":"output","Package":"example.com/subtests","Output":"FAIL\texample.com/subtests\t0.002s\n","OutputType":"frame"}
+{"Time":"2026-10-26T19:40:29.770581629+01:00","Action":"fail","Package":"example.com/subtests","Elapsed":0.002}

go/buildstep/conformance/captured/go/timeout.jsonl

@@ -0,0 +1,43 @@
+{"Time":"2026-10-25T15:34:36.049580618+01:00","Action":"start","Package":"example.com/timeout"}
+{"Time":"2026-10-25T15:34:36.053250986+01:00","Action":"run","Package":"example.com/timeout","Test":"TestQuick"}
+{"Time":"2026-10-25T15:34:36.053354018+01:00","Action":"output","Package":"example.com/timeout","Test":"TestQuick","Output":"=== RUN   TestQuick\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:36.053459789+01:00","Action":"output","Package":"example.com/timeout","Test":"TestQuick","Output":"--- PASS: TestQuick (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:36.05348499+01:00","Action":"pass","Package":"example.com/timeout","Test":"TestQuick","Elapsed":0}
+{"Time":"2026-10-25T15:34:36.0535114+01:00","Action":"run","Package":"example.com/timeout","Test":"TestWaitsForever"}
+{"Time":"2026-10-25T15:34:36.05351549+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"=== RUN   TestWaitsForever\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:36.053567451+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"    p_test.go:11: waiting for the bus\n"}
+{"Time":"2026-10-25T15:34:38.064693307+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"panic: test timed out after 2s\n"}
+{"Time":"2026-10-25T15:34:38.06487122+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\trunning tests:\n"}
+{"Time":"2026-10-25T15:34:38.06491684+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t\tTestWaitsForever (2s)\n"}
+{"Time":"2026-10-25T15:34:38.065034382+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
+{"Time":"2026-10-25T15:34:38.065108573+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 33 [running]:\n"}
+{"Time":"2026-10-25T15:34:38.065154754+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*M).startAlarm.func1()\n"}
+{"Time":"2026-10-25T15:34:38.065386208+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2961 +0x34a\n"}
+{"Time":"2026-10-25T15:34:38.065431878+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"created by time.goFunc\n"}
+{"Time":"2026-10-25T15:34:38.0655151+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/time/sleep.go:182 +0x2d\n"}
+{"Time":"2026-10-25T15:34:38.06553471+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
+{"Time":"2026-10-25T15:34:38.065847805+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 1 [chan receive]:\n"}
+{"Time":"2026-10-25T15:34:38.066038298+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*T).Run(0x3a0209bc8008, {0x5580aa?, 0x3a0209a9caa0?}, 0x6d5b10)\n"}
+{"Time":"2026-10-25T15:34:38.066047488+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2268 +0x4f2\n"}
+{"Time":"2026-10-25T15:34:38.066051368+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.runTests.func1(0x3a0209bc8008)\n"}
+{"Time":"2026-10-25T15:34:38.066056128+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2744 +0x37\n"}
+{"Time":"2026-10-25T15:34:38.066059478+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.tRunner(0x3a0209bc8008, 0x3a0209a9cbc8)\n"}
+{"Time":"2026-10-25T15:34:38.066064958+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:34:38.066069599+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.runTests({0x559017, 0x13}, {0x559017, 0x13}, 0x3a0209b8e0d8, {0x6f19f0, 0x2, 0x2}, {0xc2afa2bf832a3f56, 0x773908b5, ...})\n"}
+{"Time":"2026-10-25T15:34:38.066083309+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2742 +0x510\n"}
+{"Time":"2026-10-25T15:34:38.066086879+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*M).Run(0x3a0209b8c1e0)\n"}
+{"Time":"2026-10-25T15:34:38.066090269+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2602 +0x6af\n"}
+{"Time":"2026-10-25T15:34:38.066093429+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"main.main()\n"}
+{"Time":"2026-10-25T15:34:38.066097569+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t_testmain.go:48 +0x9b\n"}
+{"Time":"2026-10-25T15:34:38.066100639+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
+{"Time":"2026-10-25T15:34:38.066103769+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 20 [sleep]:\n"}
+{"Time":"2026-10-25T15:34:38.066106969+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"time.Sleep(0xdf8475800)\n"}
+{"Time":"2026-10-25T15:34:38.066110279+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
+{"Time":"2026-10-25T15:34:38.066113639+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"example.com/timeout.TestWaitsForever(0x3a0209bc8488?)\n"}
+{"Time":"2026-10-25T15:34:38.066117109+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/tmp/fix-1901b/timeout/p_test.go:12 +0x48\n"}
+{"Time":"2026-10-25T15:34:38.066120239+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.tRunner(0x3a0209bc8488, 0x6d5b10)\n"}
+{"Time":"2026-10-25T15:34:38.066123509+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:34:38.066126839+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"created by testing.(*T).Run in goroutine 1\n"}
+{"Time":"2026-10-25T15:34:38.066129989+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-25T15:34:38.066986453+01:00","Action":"output","Package":"example.com/timeout","Output":"FAIL\texample.com/timeout\t2.017s\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:34:38.067002113+01:00","Action":"fail","Package":"example.com/timeout","Elapsed":2.017}

go/buildstep/conformance/captured/node/crash.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/crash.tap

@@ -0,0 +1,41 @@
+TAP version 13
+# Subtest: passes before the crash
+ok 1 - passes before the crash
+  ---
+  duration_ms: 0.746694
+  type: 'test'
+  ...
+# Subtest: throws after it returned
+ok 2 - throws after it returned
+  ---
+  duration_ms: 0.763364
+  type: 'test'
+  ...
+# Subtest: waits after the throw
+ok 3 - waits after the throw
+  ---
+  duration_ms: 49.953893
+  type: 'test'
+  ...
+# Error: Test "throws after it returned" at test/b.test.ts:2:1 generated asynchronous activity after the test ended. This activity created the error "Error: the bus closed under the test" and would have caused the test to fail, but instead triggered an uncaughtException event.
+# Subtest: test/b.test.ts
+not ok 2 - test/b.test.ts
+  ---
+  duration_ms: 155.864774
+  type: 'test'
+  location: '/tmp/1901k/node/crash/test/b.test.ts:1:1'
+  failureType: 'testCodeFailure'
+  exitCode: 1
+  signal: ~
+  error: 'test failed'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..4
+# tests 4
+# suites 0
+# pass 3
+# fail 1
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms 168.479173

go/buildstep/conformance/captured/node/logcrash.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/logcrash.tap

@@ -0,0 +1,42 @@
+TAP version 13
+# retrying after Error: the store was not ready yet
+# Subtest: passes and logs
+ok 1 - passes and logs
+  ---
+  duration_ms: 1.184595
+  type: 'test'
+  ...
+# Subtest: throws after it returned
+ok 2 - throws after it returned
+  ---
+  duration_ms: 0.748862
+  type: 'test'
+  ...
+# Subtest: waits after the throw
+ok 3 - waits after the throw
+  ---
+  duration_ms: 51.019875
+  type: 'test'
+  ...
+# Error: Test "throws after it returned" at test/b.test.ts:2:1 generated asynchronous activity after the test ended. This activity created the error "Error: the bus closed under the test" and would have caused the test to fail, but instead triggered an uncaughtException event.
+# Subtest: test/b.test.ts
+not ok 2 - test/b.test.ts
+  ---
+  duration_ms: 172.91715
+  type: 'test'
+  location: '/tmp/1901k/node/logcrash/test/b.test.ts:1:1'
+  failureType: 'testCodeFailure'
+  exitCode: 1
+  signal: ~
+  error: 'test failed'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..4
+# tests 4
+# suites 0
+# pass 3
+# fail 1
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms 185.744334

go/buildstep/conformance/captured/node/suite.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/suite.tap

@@ -0,0 +1,61 @@
+TAP version 13
+# Subtest: the seat
+    # Subtest: passes inside
+    ok 1 - passes inside
+      ---
+      duration_ms: 0.577396
+      type: 'test'
+      ...
+    # Subtest: fails inside
+    not ok 2 - fails inside
+      ---
+      duration_ms: 1.621198
+      type: 'test'
+      location: '/tmp/1901k/node/suite/test/a.test.ts:5:3'
+      failureType: 'testCodeFailure'
+      error: |-
+        Expected values to be strictly deep-equal:
+        + actual - expected
+        
+          {
+        +   holders: 2
+        -   holders: 1
+          }
+        
+      code: 'ERR_ASSERTION'
+      name: 'AssertionError'
+      expected:
+        holders: 1
+      actual:
+        holders: 2
+      operator: 'deepStrictEqual'
+      stack: |-
+        TestContext.<anonymous> (file:///tmp/1901k/node/suite/test/a.test.ts:5:37)
+        Test.runInAsyncScope (node:async_hooks:226:14)
+        Test.run (node:internal/test_runner/test:1402:25)
+        Suite.processPendingSubtests (node:internal/test_runner/test:974:18)
+        Test.postRun (node:internal/test_runner/test:1542:19)
+        Test.run (node:internal/test_runner/test:1467:12)
+        async Promise.all (index 0)
+        async Suite.run (node:internal/test_runner/test:1905:7)
+        async startSubtestAfterBootstrap (node:internal/test_runner/harness:387:3)
+      ...
+    1..2
+not ok 1 - the seat
+  ---
+  duration_ms: 3.295664
+  type: 'suite'
+  location: '/tmp/1901k/node/suite/test/a.test.ts:3:1'
+  failureType: 'subtestsFailed'
+  error: '1 subtest failed'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..1
+# tests 2
+# suites 1
+# pass 1
+# fail 1
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms 115.948112

go/buildstep/conformance/captured/node/syntax.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/syntax.tap

@@ -0,0 +1,47 @@
+TAP version 13
+# Subtest: passes in the first file
+ok 1 - passes in the first file
+  ---
+  duration_ms: 0.637465
+  type: 'test'
+  ...
+# node:internal/modules/run_main:111
+#     triggerUncaughtException(
+#     ^
+# file:///tmp/1901k/node/syntax/test/b.test.ts:2
+# test('never loads', () => {
+# SyntaxError [ERR_INVALID_TYPESCRIPT_SYNTAX]: Expected ',', got '<eof>'
+#     at parseTypeScript (node:internal/modules/typescript:61:36)
+#     at processTypeScriptCode (node:internal/modules/typescript:129:37)
+#     at Object.stripTypeScriptModuleTypes (node:internal/modules/typescript:172:22)
+#     at stripTypeScriptModuleTypes (node:internal/modules/esm/translators:35:49)
+#     at ModuleLoader.<anonymous> (node:internal/modules/esm/translators:688:29)
+#     at \#translate (node:internal/modules/esm/loader:441:20)
+#     at afterLoad (node:internal/modules/esm/loader:509:29)
+#     at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:514:12)
+#     at \#getOrCreateModuleJobAfterResolve (node:internal/modules/esm/loader:567:36)
+#     at afterResolve (node:internal/modules/esm/loader:614:52) {
+#   code: 'ERR_INVALID_TYPESCRIPT_SYNTAX'
+# }
+# Node.js v26.12.1
+# Subtest: test/b.test.ts
+not ok 2 - test/b.test.ts
+  ---
+  duration_ms: 87.629815
+  type: 'test'
+  location: '/tmp/1901k/node/syntax/test/b.test.ts:1:1'
+  failureType: 'testCodeFailure'
+  exitCode: 1
+  signal: ~
+  error: 'test failed'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..2
+# tests 2
+# suites 0
+# pass 1
+# fail 1
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms 106.551435

go/buildstep/conformance/captured/node/timeout.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/timeout.tap

@@ -0,0 +1,26 @@
+TAP version 13
+# Subtest: passes before the wait
+ok 1 - passes before the wait
+  ---
+  duration_ms: 0.683015
+  type: 'test'
+  ...
+# Subtest: waits for an answer that never comes
+not ok 2 - waits for an answer that never comes
+  ---
+  duration_ms: 201.103775
+  type: 'test'
+  location: '/tmp/1901k/node/timeout/test/a.test.ts:3:1'
+  failureType: 'testTimeoutFailure'
+  error: 'test timed out after 200ms'
+  code: 'ERR_TEST_FAILURE'
+  ...
+1..2
+# tests 2
+# suites 0
+# pass 1
+# fail 0
+# cancelled 1
+# skipped 0
+# todo 0
+# duration_ms 308.920061

go/buildstep/conformance/captured/node/two-files.console

@@ -0,0 +1,2 @@
+npm notice run test
+npm notice run node --test --experimental-strip-types 'test/*.test.ts'

go/buildstep/conformance/captured/node/two-files.tap

@@ -0,0 +1,49 @@
+TAP version 13
+# Subtest: passes in the first file
+ok 1 - passes in the first file
+  ---
+  duration_ms: 0.740124
+  type: 'test'
+  ...
+# judged against the seat as it stands
+# Subtest: passes in the second file first
+ok 2 - passes in the second file first
+  ---
+  duration_ms: 0.916463
+  type: 'test'
+  ...
+# Subtest: fails in the second file
+not ok 3 - fails in the second file
+  ---
+  duration_ms: 1.719236
+  type: 'test'
+  location: '/tmp/1901k/node/two-files/test/b.test.ts:4:1'
+  failureType: 'testCodeFailure'
+  error: |-
+    one plus one is not three
+    
+    2 !== 3
+    
+  code: 'ERR_ASSERTION'
+  name: 'AssertionError'
+  expected: 3
+  actual: 2
+  operator: 'strictEqual'
+  stack: |-
+    TestContext.<anonymous> (file:///tmp/1901k/node/two-files/test/b.test.ts:6:10)
+    Test.runInAsyncScope (node:async_hooks:226:14)
+    Test.run (node:internal/test_runner/test:1402:25)
+    Test.processPendingSubtests (node:internal/test_runner/test:974:18)
+    Test.postRun (node:internal/test_runner/test:1542:19)
+    Test.run (node:internal/test_runner/test:1467:12)
+    async startSubtestAfterBootstrap (node:internal/test_runner/harness:387:3)
+  ...
+1..3
+# tests 3
+# suites 0
+# pass 2
+# fail 1
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms 135.931121

go/buildstep/conformance/captured/tsc/typeerror.console

@@ -0,0 +1 @@
+seat.ts(2,14): error TS2322: Type 'number' is not assignable to type 'string'.

go/buildstep/conformance/conformance.go

@@ -0,0 +1,201 @@
+// Package conformance is the kit every build module's tests run (novox/hq issue 1901, its thorough fix): real output of
+// the test runners, captured with the build nodes' own toolchains (captured/README.md), and what a build module must say
+// of each failure in it under the failure contract (buildstep.Failure). A build module's test calls Run with its own parse
+// path, the code that turns a runner's output into the failures of its test result; the kit fails the test when a
+// failure is not named, its cause is missing or wrong, or a passing line stands in its place.
+//
+// A catalogue check (mesh-catalog checks/failurekit) refuses a build module with a test step whose tests do not call Run,
+// and any build module whose tests do not call LeftRunning, the kit's case of steps a previous process left running
+// (leftrunning.go, issue 1890).
+package conformance
+
+import (
+	"embed"
+	"fmt"
+	"strings"
+	"testing"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+)
+
+// The runners the kit holds output of.
+const (
+	// GoTest is `go test -json -count=1 ./...`: Output.Stdout is its output (go1.27.3).
+	GoTest = "go test -json"
+	// NodeTest is a package's `npm test` running `node --test --experimental-strip-types` with
+	// NODE_OPTIONS=buildstep.NodeTestOptions(<file>): Output.Report is the TAP file, Output.Stdout the script's own output
+	// and stderr, Output.Dir the package's directory as it was captured (node v26.12.1, npm 12.2.1).
+	NodeTest = "node --test"
+	// TypeCheck is tsc's type-check (`tsc --noEmit`, typescript 5.9.3): Output.Stdout is what it wrote; its failure
+	// names the test "type-check".
+	TypeCheck = "tsc"
+)
+
+// Output is one captured run of a runner, as a build module's parse path takes it.
+type Output struct {
+	Stdout, Stderr string
+	// Report is what a runner wrote to a report file of its own (node --test's TAP), "" for the others.
+	Report string
+	// Dir is the directory the run was captured in: a node test's file is said relative to it.
+	Dir string
+}
+
+// Parse is a build module's own parse path: the failures its test result would carry for one run that failed.
+type Parse func(Output) []buildstep.Failure
+
+// Case is one captured run and what its failure must say.
+type Case struct {
+	Name   string
+	Runner string
+	// Test is the failing test the failure names (for a package that stopped, the tests that were running; "" for none).
+	Test string
+	// File, when set, is where the failing test is.
+	File string
+	// Cause holds what the failure's cause must contain.
+	Cause []string
+	// Passing are the names of tests that passed in the run, and what they logged: no failure's words may hold them.
+	Passing []string
+}
+
+//go:embed captured
+var captured embed.FS
+
+// Cases are the kit's cases of a runner.
+func Cases(runner string) []Case {
+	var out []Case
+	for _, c := range cases {
+		if c.Runner == runner {
+			out = append(out, c)
+		}
+	}
+	return out
+}
+
+var cases = []Case{
+	{Name: "passfirst", Runner: GoTest, Test: "TestTheSecondPackageFails", Cause: []string{"the seat has 2 holders, want 1"},
+		Passing: []string{"TestTheFirstPackagePasses", "TestTheSecondPackagePassesFirst"}},
+	{Name: "subtests", Runner: GoTest, Test: "TestTheTable/fails", Cause: []string{"got 3 machines, want 4"}, Passing: []string{"TestTheTable/passes"}},
+	{Name: "logthenfatal", Runner: GoTest, Test: "TestThree", Cause: []string{"3 subscription(s) derive to a subject no emitter owns:"}},
+	{Name: "panicking", Runner: GoTest, Test: "TestPanics", Cause: []string{"panic: assignment to entry in nil map"}},
+	{Name: "timeout", Runner: GoTest, Test: "TestWaitsForever", Cause: []string{"panic: test timed out after 2s", "TestWaitsForever"}},
+	{Name: "deeptimeout", Runner: GoTest, Test: "TestHoldsTheSeat, TestWaitsForTheBus", Cause: []string{"panic: test timed out after 2s", "TestHoldsTheSeat", "TestWaitsForTheBus"}},
+	{Name: "buildfail", Runner: GoTest, Cause: []string{`cannot use "seat" (untyped string constant) as int value`}},
+	{Name: "exiting", Runner: GoTest, Test: "TestExits", Cause: []string{"exited", "TestExits"}},
+	{Name: "killed", Runner: GoTest, Test: "TestKilled", Cause: []string{"signal: killed"}},
+	{Name: "passthenfail", Runner: GoTest, Cause: []string{"panic: the bus closed after the tests: nats: connection closed"}},
+	{Name: "mainexit", Runner: GoTest, Cause: []string{"passed", "exited"}},
+	{Name: "race", Runner: GoTest, Test: "TestRacesOnTheSeat", Cause: []string{"DATA RACE", "Write at", "example.com/race.TestRacesOnTheSeat.func1()", "p_test.go:13", "created at example.com/race.TestRacesOnTheSeat()"}},
+	{Name: "subpanic", Runner: GoTest, Test: "TestTable/panics", Cause: []string{"panic: assignment to entry in nil map"}, Passing: []string{"TestTable/passes"}},
+	{Name: "racemain", Runner: GoTest, Cause: []string{"DATA RACE", "Write at", "example.com/racemain.TestMain.func1()", "p_test.go:15", "created at example.com/racemain.TestMain()"}},
+
+	{Name: "two-files", Runner: NodeTest, Test: "fails in the second file", File: "test/b.test.ts:4:1", Cause: []string{"one plus one is not three"},
+		Passing: []string{"passes in the first file", "passes in the second file first"}},
+	{Name: "suite", Runner: NodeTest, Test: "fails inside", File: "test/a.test.ts:5:3", Cause: []string{"Expected values to be strictly deep-equal:"},
+		Passing: []string{"passes inside"}},
+	{Name: "crash", Runner: NodeTest, Test: "test/b.test.ts", File: "test/b.test.ts:1:1", Cause: []string{"the bus closed under the test"},
+		Passing: []string{"passes before the crash"}},
+	{Name: "logcrash", Runner: NodeTest, Test: "test/b.test.ts", File: "test/b.test.ts:1:1", Cause: []string{"the bus closed under the test"},
+		Passing: []string{"passes and logs", "retrying after Error: the store was not ready yet"}},
+	{Name: "timeout", Runner: NodeTest, Test: "waits for an answer that never comes", File: "test/a.test.ts:3:1", Cause: []string{"test timed out after 200ms"},
+		Passing: []string{"passes before the wait"}},
+	{Name: "syntax", Runner: NodeTest, Test: "test/b.test.ts", File: "test/b.test.ts:1:1", Cause: []string{"SyntaxError", "Expected ',', got '<eof>'"},
+		Passing: []string{"passes in the first file"}},
+
+	{Name: "typeerror", Runner: TypeCheck, Test: "type-check", Cause: []string{"seat.ts(2,14): error TS2322: Type 'number' is not assignable to type 'string'."}},
+}
+
+// Load is the captured output of a case.
+func Load(c Case) (Output, error) {
+	switch c.Runner {
+	case GoTest:
+		b, err := captured.ReadFile("captured/go/" + c.Name + ".jsonl")
+		return Output{Stdout: string(b)}, err
+	case NodeTest:
+		report, err := captured.ReadFile("captured/node/" + c.Name + ".tap")
+		if err != nil {
+			return Output{}, err
+		}
+		console, err := captured.ReadFile("captured/node/" + c.Name + ".console")
+		return Output{Report: string(report), Stdout: string(console), Dir: "/tmp/1901k/node/" + c.Name}, err
+	default:
+		b, err := captured.ReadFile("captured/tsc/" + c.Name + ".console")
+		return Output{Stdout: string(b), Dir: "/tmp/1901k/tsc/" + c.Name}, err
+	}
+}
+
+// Run runs every case of runner through parse, each as a subtest, and fails a case whose failure does not keep the
+// contract: exactly one failure, naming the failing test (and its file, where the runner says it), with a cause that
+// holds what the case says and is no passing line, an output that starts with the cause, stays within its bound and
+// holds no passing line and no passing test's name.
+func Run(t *testing.T, runner string, parse Parse) {
+	t.Helper()
+	cs := Cases(runner)
+	if len(cs) == 0 {
+		t.Fatalf("the kit holds no case of the runner %q", runner)
+	}
+	for _, c := range cs {
+		t.Run(c.Name, func(t *testing.T) {
+			out, err := Load(c)
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, problem := range Judge(c, parse(out)) {
+				t.Error(problem)
+			}
+		})
+	}
+}
+
+// Judge says what is wrong with the failures a parse path made of a case; nothing when they keep the contract.
+func Judge(c Case, failed []buildstep.Failure) []string {
+	var problems []string
+	say := func(s string) { problems = append(problems, c.Runner+" "+c.Name+": "+s) }
+	if len(failed) != 1 {
+		say(fmt.Sprintf("want one failure, got %d: %s", len(failed), describe(failed)))
+		if len(failed) == 0 {
+			return problems
+		}
+	}
+	f := failed[0]
+	if f.Test != c.Test {
+		say("the failure names the test " + quote(f.Test) + ", want " + quote(c.Test))
+	}
+	if c.File != "" && f.File != c.File {
+		say("the failure's file is " + quote(f.File) + ", want " + quote(c.File))
+	}
+	if why := buildstep.Hidden(f); why != "" {
+		say("the failure hides its cause: " + why)
+	}
+	for _, want := range c.Cause {
+		if !strings.Contains(f.Cause, want) {
+			say("the cause " + quote(f.Cause) + " does not hold " + quote(want))
+		}
+	}
+	if first := strings.SplitN(f.Output, "\n", 2)[0]; strings.TrimSpace(first) != strings.TrimSpace(f.Cause) {
+		say("the output starts with " + quote(first) + ", not with the cause")
+	}
+	if len(f.Output) > buildstep.OutputBytes+buildstep.LineBytes+64 {
+		say(fmt.Sprintf("the output holds %d bytes, over its bound", len(f.Output)))
+	}
+	for _, l := range strings.Split(f.Output, "\n") {
+		if buildstep.PassingLine(l) {
+			say("the output keeps the passing line " + quote(l))
+		}
+	}
+	for _, p := range c.Passing {
+		if strings.Contains(f.Output, p+"\n") || strings.HasSuffix(f.Output, p) || strings.Contains(f.Cause, p) || strings.Contains(f.Output, "- "+p) {
+			say("the failure's words hold the passing test " + quote(p))
+		}
+	}
+	return problems
+}
+
+func describe(failed []buildstep.Failure) string {
+	var s []string
+	for _, f := range failed {
+		s = append(s, quote(f.Package+" "+f.Test)+" ("+quote(f.Cause)+")")
+	}
+	return strings.Join(s, ", ")
+}
+
+func quote(s string) string { return fmt.Sprintf("%q", s) }

go/buildstep/conformance/conformance_test.go

@@ -0,0 +1,167 @@
+package conformance
+
+import (
+	"context"
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+)
+
+// The failure contract (issue 1901): the SDK's own parsers keep it on every captured case of the kit (1901/AC6); the
+// kit refuses what the build modules sent before it; the contract's own rules; and the Go reader's older guarantees.
+func TestTheFailureContract(t *testing.T) {
+	t.Run("the SDK parsers keep it", func(t *testing.T) {
+		Run(t, GoTest, func(o Output) []buildstep.Failure { return buildstep.ReadGoTest(o.Stdout, ".").Failed })
+		Run(t, NodeTest, func(o Output) []buildstep.Failure { return buildstep.ReadTAP(".", "test", o.Dir, o.Report, o.Stdout) })
+		Run(t, TypeCheck, func(o Output) []buildstep.Failure {
+			return []buildstep.Failure{buildstep.ConsoleFailure(".", "type-check", o.Stdout+o.Stderr)}
+		})
+	})
+
+	// 1890/AC7: the SDK's start sweep keeps the left-running case, and the kit refuses a sweep that ends nothing or ends
+	// everything.
+	t.Run("the left-running case", func(t *testing.T) {
+		LeftRunning(t, func(ctx context.Context, scan buildstep.Scan, node string, before time.Time, logf func(string, ...any)) {
+			buildstep.EndStaleAtStart(ctx, scan, node, before, logf)
+		})
+		if p := JudgeLeftRunning(func(context.Context, buildstep.Scan, string, time.Time, func(string, ...any)) {}); len(p) != 11 {
+			t.Errorf("a sweep that ends nothing: %d problems, want 11 (three steps not ended and unsaid, one owner unnamed, two asks not deleted and unsaid):\n%s", len(p), strings.Join(p, "\n"))
+		}
+		wrongNode := func(ctx context.Context, scan buildstep.Scan, _ string, before time.Time, logf func(string, ...any)) {
+			buildstep.EndStaleAtStart(ctx, scan, "kitother", before, logf)
+		}
+		if p := JudgeLeftRunning(wrongNode); len(p) == 0 {
+			t.Error("a sweep of another node's steps is not refused")
+		}
+	})
+
+	// node's output cut to its first fifteen lines with no cause, whose first line was a passing test of the first file
+	// (mesh-build-node's lines() before the contract), and a Go failure keeping its first line.
+	t.Run("the kit refuses a failure that hides its cause", func(t *testing.T) {
+		firstLines := func(s string) string {
+			var keep []string
+			for _, l := range strings.Split(s, "\n") {
+				if l = strings.TrimSpace(l); l != "" && len(keep) < 15 {
+					keep = append(keep, l)
+				}
+			}
+			return strings.Join(keep, "\n")
+		}
+		for _, c := range []struct {
+			runner, name string
+			old          func(Output) []buildstep.Failure
+		}{
+			{NodeTest, "two-files", func(o Output) []buildstep.Failure {
+				return []buildstep.Failure{{Package: ".", Test: "test", Output: firstLines(o.Report)}}
+			}},
+			{GoTest, "passfirst", func(o Output) []buildstep.Failure {
+				return []buildstep.Failure{{Package: "example.com/passfirst/b", Test: "TestTheSecondPackageFails", Cause: "ok  \texample.com/passfirst/a", Output: "--- PASS: TestTheSecondPackagePassesFirst"}}
+			}},
+		} {
+			for _, k := range Cases(c.runner) {
+				if k.Name != c.name {
+					continue
+				}
+				out, err := Load(k)
+				if err != nil {
+					t.Fatal(err)
+				}
+				if problems := Judge(k, c.old(out)); len(problems) == 0 {
+					t.Errorf("%s %s: the kit passed a failure that hides its cause", c.runner, c.name)
+				}
+			}
+		}
+	})
+
+	// What a passing line is (a test's own line starting "ok " is none), when a failure hides its cause, and that a long
+	// failure keeps its last lines within the bound and starts with a real line for an older checker, which reads only
+	// the first line of the output cut to 120 characters (1901/AC1, AC3).
+	t.Run("its rules", func(t *testing.T) {
+		for _, c := range []struct {
+			line    string
+			passing bool
+		}{
+			{"✔ the same merge has the same id (8.0ms)", true}, {"ok 1 - passes", true}, {"    ok 3 - inside", true},
+			{"ok  \texample.com/a\t0.01s", true}, {"PASS", true}, {"--- PASS: TestA (0.00s)", true},
+			{"    --- PASS: TestA/sub (0.00s)", true}, {"✖ fails (1ms)", false}, {"not ok 2 - fails", false},
+			{"okay, the seat moved", false}, {"ok then: the store refused the write", false}, {"ok  the seat", false}, {"FAIL", false},
+		} {
+			if buildstep.PassingLine(c.line) != c.passing {
+				t.Errorf("PassingLine(%q) = %v, want %v", c.line, !c.passing, c.passing)
+			}
+		}
+		if buildstep.Hidden(buildstep.Failure{Cause: "the seat has 2 holders"}) != "" || buildstep.Hidden(buildstep.Failure{}) == "" ||
+			buildstep.Hidden(buildstep.Failure{Cause: "✔ passes (1ms)"}) == "" {
+			t.Error("Hidden does not tell a real cause from none and from a passing line")
+		}
+		var lines []string
+		for i := 0; i < 400; i++ {
+			lines = append(lines, "    x_test.go:1: log line "+strings.Repeat("y", 40))
+		}
+		lines = append(lines, "    x_test.go:9: the real cause", "--- FAIL: TestX (0.00s)")
+		oldFirst := func(out string) string { // the older checker's rule (judge.go firstLine before issue 1901)
+			for _, l := range strings.Split(out, "\n") {
+				if l = strings.TrimSpace(l); l != "" {
+					return l[:min(len(l), 120)]
+				}
+			}
+			return ""
+		}
+		for _, cause := range []string{"the real cause", ""} {
+			out := buildstep.Clip(lines, cause)
+			if len(out) > buildstep.OutputBytes+buildstep.LineBytes {
+				t.Errorf("1901/AC1: kept %d bytes, bound is %d", len(out), buildstep.OutputBytes)
+			}
+			if !strings.HasSuffix(out, "the real cause\n--- FAIL: TestX (0.00s)") || !strings.Contains(out, "\n... (") {
+				t.Errorf("1901/AC1: the last lines or the marker are lost: %q...%q", out[:40], out[len(out)-60:])
+			}
+			if got := oldFirst(out); strings.HasPrefix(got, "... (") || got == "" || (cause != "" && got != cause) {
+				t.Errorf("1901/AC3: cause %q: an older checker would read %q", cause, got)
+			}
+		}
+	})
+
+	// The Go reader (moved from mesh-build-go): an older checker, which knows no "cause" field, still reads a failure and
+	// gets at least the lines it kept (1901/AC3); a test's indented log line saying "panic:" is not the cause, go's own at
+	// column 0 is (1901/AC4); and each package counts its own skipped tests (issue 890).
+	t.Run("the Go reader", func(t *testing.T) {
+		read := func(name string) string {
+			raw, err := captured.ReadFile("captured/go/" + name + ".jsonl")
+			if err != nil {
+				t.Fatal(err)
+			}
+			return string(raw)
+		}
+		b, _ := json.Marshal(buildstep.ReadGoTest(read("logthenfatal"), ".").Failed)
+		var old []struct {
+			Output string `json:"output,omitempty"`
+		}
+		if err := json.Unmarshal(b, &old); err != nil || len(old) != 1 || !strings.Contains(old[0].Output, "judged against") || !strings.Contains(old[0].Output, "3 subscription(s)") {
+			t.Errorf("1901/AC3: an older checker reads %+v, %v", old, err)
+		}
+		lines := strings.SplitAfter(read("deeptimeout"), "\n")
+		added := `{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"    p_test.go:9: the child said:\n"}` + "\n" +
+			`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        panic: child retried and recovered\n"}` + "\n" +
+			`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        WARNING: DATA RACE\n"}` + "\n"
+		if got := buildstep.ReadGoTest(strings.Join(lines[:10], "")+added+strings.Join(lines[10:], ""), ".").Failed; len(got) != 1 || !strings.HasPrefix(got[0].Cause, "panic: test timed out after 2s") {
+			t.Errorf("1901/AC4: failures = %+v, want the timeout's panic as the cause", got)
+		}
+		res := buildstep.ReadGoTest(`{"Action":"run","Package":"m/a","Test":"TestA"}
+{"Action":"skip","Package":"m/a","Test":"TestA","Elapsed":0}
+{"Action":"run","Package":"m/b","Test":"TestB"}
+{"Action":"pass","Package":"m/b","Test":"TestB","Elapsed":0}
+{"Action":"pass","Package":"m/a","Elapsed":0}
+{"Action":"pass","Package":"m/b","Elapsed":0}
+`, ".")
+		got := map[string]int{}
+		for _, p := range res.Packages {
+			got[p.Package] = p.Skipped
+		}
+		if res.Skipped != 1 || got["m/a"] != 1 || got["m/b"] != 0 {
+			t.Errorf("skipped = %d, per package %v, want 1 with m/a 1 and m/b 0", res.Skipped, got)
+		}
+	})
+}

go/buildstep/conformance/leftrunning.go

@@ -0,0 +1,212 @@
+package conformance
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"sort"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// **A step left running by a previous process** (novox/hq issue 1890, note 21): when a delivery replaced mesh-build-go
+// on a node while a check ask ran, the new process's start sweep let the ask's key stand as running, and it held one
+// of the node's build slots until a hand end. Every build module runs this case (LeftRunning) through the start sweep
+// its main runs: the hand-started steps a previous process left are ended at once and loud, its asks' keys deleted (the
+// stream redelivers the ask, novox/hq ADR 0525 §6, and its asker keeps waiting for that), what this process runs kept. A
+// catalogue check (mesh-catalog checks/failurekit) refuses a build module whose tests do not call LeftRunning.
+
+// Sweep is a build module's own start sweep, as its main runs it once at its start: it ends node's steps in scan that
+// no process of the module runs any more (buildstep.EndStaleAtStart, here with the runtime already serving), before
+// being the start of the process, saying each end with logf.
+type Sweep func(ctx context.Context, scan buildstep.Scan, node string, before time.Time, logf func(string, ...any))
+
+// LeftNode is the node the case's steps are of.
+const LeftNode = "kitnode"
+
+// leftCase is one step in the steps state before the sweep, and whether the sweep must end it.
+type leftCase struct {
+	id, tool, owner, state string
+	node                   string
+	age                    time.Duration // started this long before the process began (negative: after it)
+	ended                  bool
+	deleted                bool // a gone process's ask: its key is deleted, not ended
+}
+
+// gone is a previous process's owner on the same node.
+var gone = "b00t-of-the-kit.4242.mvp0000"
+
+func leftCases() []leftCase {
+	return []leftCase{
+		{id: "mvpwlkzi7e6ca8", tool: "check ask", owner: gone, age: 5 * time.Minute, deleted: true}, // note 21's ghost
+		{id: "mvpwlkzi7e6ca9", tool: "delivery ask", owner: gone, age: -time.Second, deleted: true},
+		{id: "gonehand1", tool: "build_x_test", owner: gone, age: time.Minute, ended: true},
+		{id: "oldhand1", tool: "build_x_fetch", age: time.Hour, ended: true},                // no owner: an older build's
+		{id: "mvpwlkzi7e6caa", tool: "check ask", age: time.Hour, ended: true},              // no owner, past the bound
+		{id: "mvpwlkzi7e6cab", tool: "check ask", age: 5 * time.Minute},                     // no owner, the stream's still
+		{id: "mvpwlkzi7e6cac", tool: "check ask", owner: buildstep.Owner, age: time.Minute}, // this process's
+		{id: "minehand1", tool: "build_x_test", owner: buildstep.Owner, age: -time.Second},
+		{id: "donehand1", tool: "build_x_test", owner: gone, age: time.Hour, state: delivery.StepPassed},
+		{id: "otherhand1", tool: "build_x_test", owner: gone, age: time.Hour, node: "kitother"},
+	}
+}
+
+// LeftRunning runs the case through sweep and fails the test for each step the sweep ended or kept wrongly, or ended
+// without saying it.
+func LeftRunning(t *testing.T, sweep Sweep) {
+	t.Helper()
+	for _, problem := range JudgeLeftRunning(sweep) {
+		t.Error(problem)
+	}
+}
+
+// JudgeLeftRunning says what is wrong with what sweep did to the case; nothing when it keeps the rule.
+func JudgeLeftRunning(sweep Sweep) []string {
+	st := &steps{vals: map[string][]byte{}, revs: map[string]uint64{}}
+	before := time.Now()
+	for _, c := range leftCases() {
+		node, state := c.node, c.state
+		if node == "" {
+			node = LeftNode
+		}
+		if state == "" {
+			state = delivery.StepRunning
+		}
+		key, _ := delivery.StepKey(node, c.id)
+		raw, err := delivery.EncodeStep(delivery.Step{ID: c.id, Tool: c.tool, Node: node, State: state, Started: before.Add(-c.age).UTC(), Owner: c.owner})
+		if err != nil {
+			return []string{"the kit's step " + c.id + ": " + err.Error()}
+		}
+		st.set(key, raw)
+	}
+	served := make(chan struct{})
+	close(served)
+	was := buildstep.StaleServed
+	buildstep.StaleServed = func() <-chan struct{} { return served }
+	defer func() { buildstep.StaleServed = was }()
+	var mu sync.Mutex
+	var said []string
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	sweep(ctx, st.scan(), LeftNode, before, func(f string, a ...any) {
+		mu.Lock()
+		defer mu.Unlock()
+		said = append(said, fmt.Sprintf(f, a...))
+	})
+	mu.Lock()
+	log := strings.Join(said, "\n")
+	mu.Unlock()
+	var problems []string
+	for _, c := range leftCases() {
+		node := c.node
+		if node == "" {
+			node = LeftNode
+		}
+		key, _ := delivery.StepKey(node, c.id)
+		raw := st.get(key)
+		if c.deleted {
+			if raw != nil {
+				problems = append(problems, fmt.Sprintf("left running: the ask %s of the gone owner %q is still held after the sweep (%s); "+
+					"its key is deleted, never ended: the stream redelivers it (ADR 0525 §6)", key, c.owner, raw))
+			}
+			if !strings.Contains(log, key) || !strings.Contains(log, c.owner) {
+				problems = append(problems, "left running: the delete of "+key+" is not said with its owner "+c.owner)
+			}
+			continue
+		}
+		if raw == nil {
+			problems = append(problems, "left running: the step "+key+" is gone after the sweep, want it kept or ended")
+			continue
+		}
+		s, err := delivery.DecodeStep(raw)
+		if err != nil {
+			problems = append(problems, key+": "+err.Error())
+			continue
+		}
+		want := c.state
+		if want == "" {
+			want = delivery.StepRunning
+		}
+		if c.ended {
+			want = delivery.StepFailed
+		}
+		if s.State != want {
+			problems = append(problems, fmt.Sprintf("left running: the step %s (%s, owner %q, %s before the start) is %s after the sweep, want %s", key, c.tool, c.owner, c.age, s.State, want))
+		}
+		if c.ended && !strings.Contains(log, key) {
+			problems = append(problems, "left running: the end of "+key+" is not said")
+		}
+		if c.ended && c.owner != "" && !strings.Contains(log, c.owner) {
+			problems = append(problems, "left running: the end of "+key+" does not name its owner "+c.owner)
+		}
+	}
+	sort.Strings(problems)
+	return problems
+}
+
+// steps is a steps state with revisions, whose Update lands only at the revision read (stdio.ErrChanged otherwise).
+type steps struct {
+	mu   sync.Mutex
+	vals map[string][]byte
+	revs map[string]uint64
+}
+
+func (s *steps) set(key string, raw []byte) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.vals[key], s.revs[key] = raw, s.revs[key]+1
+}
+
+func (s *steps) get(key string) []byte {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.vals[key]
+}
+
+func (s *steps) scan() buildstep.Scan {
+	return buildstep.Scan{
+		Keys: func() ([]string, error) {
+			s.mu.Lock()
+			defer s.mu.Unlock()
+			var out []string
+			for k := range s.vals {
+				out = append(out, k)
+			}
+			return out, nil
+		},
+		Get: func(key string) (json.RawMessage, uint64, error) {
+			s.mu.Lock()
+			defer s.mu.Unlock()
+			return s.vals[key], s.revs[key], nil
+		},
+		Delete: func(key string, revision uint64) error {
+			s.mu.Lock()
+			defer s.mu.Unlock()
+			if s.revs[key] != revision {
+				return stdio.ErrChanged
+			}
+			delete(s.vals, key)
+			s.revs[key]++
+			return nil
+		},
+		Update: func(key string, value any, revision uint64) (uint64, error) {
+			raw, err := json.Marshal(value)
+			if err != nil {
+				return 0, err
+			}
+			s.mu.Lock()
+			defer s.mu.Unlock()
+			if s.revs[key] != revision {
+				return 0, stdio.ErrChanged
+			}
+			s.vals[key], s.revs[key] = raw, revision+1
+			return revision + 1, nil
+		},
+	}
+}

go/buildstep/failure.go

@@ -0,0 +1,147 @@
+package buildstep
+
+// The failure contract of a build step's test level (novox/hq issue 1901, its thorough fix): what a build module says of
+// each test that failed, the same for every language. Each build module used to parse its own test runner's output, and
+// a fix in one never reached the others: a failed Go test kept a t.Logf line, a failed node --test run kept a passing
+// '✔' line of its first file. The parsers that fill the contract live here (gotest.go, tap.go) and the conformance kit
+// (package conformance) holds every build module to them with captured runner output.
+
+import (
+	"fmt"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/sdkversion"
+)
+
+// Failure is one test that failed, or a package or file that failed with no test to name (a build that failed, a test
+// program that panicked, a test file that did not load). The JSON names are the ones mesh-build-go and the checker have
+// always used; File is new and an older reader ignores it.
+type Failure struct {
+	// Package is the Go package's import path, or the TypeScript package's directory in the workspace.
+	Package string `json:"package"`
+	// Test names the failing test, or the tests that were running when the program stopped; "" when none can be named.
+	Test string `json:"test,omitempty"`
+	// File is where the failing test is (a Go test's file and line is in its Cause; node names the test's file:line:col).
+	File string `json:"file,omitempty"`
+	// Cause is the one line that says why: the assertion's or the error's first line, a "panic:" line, a build's first
+	// error, or words saying how the program stopped. **Never empty, and never a passing line** (PassingLine).
+	Cause string `json:"cause,omitempty"`
+	// Output is the failing test's own output, its last lines up to OutputBytes, Cause first: an older checker reads
+	// only its first line.
+	Output string `json:"output,omitempty"`
+}
+
+// OutputBytes is the most a failure keeps of its output, and LineBytes the most of one line: four kilobytes holds a long
+// assertion message and stays far under a bus message's or a verdict's bound.
+const (
+	OutputBytes = 4096
+	LineBytes   = 1024
+)
+
+// By names a build module and the SDK it was built with, for a result's "by": the checker names it when a failure hides
+// its cause ("the build module hid the failure (<by>)").
+func By(module string) string {
+	return module + " with mesh-sdk " + sdkversion.Version()
+}
+
+// PassingLine says a line is a test runner's word for a test or a package that passed: node's '✔', TAP's "ok N" (at any
+// indent), go test's "ok  \t<pkg>", "PASS" and "--- PASS". A line of a test's own that starts "ok " is none of these. Such a line is never a failure's cause, nor part of a failure's output.
+func PassingLine(l string) bool {
+	if strings.HasPrefix(l, "ok  \t") { // go test's package line, at column 0
+		return true
+	}
+	t := strings.TrimSpace(l)
+	switch {
+	case t == "PASS", strings.HasPrefix(t, "✔"), strings.HasPrefix(t, "--- PASS"):
+		return true
+	}
+	return tapOk(t)
+}
+
+// Hidden says how a failure hides why it failed, or "" when it does not: it has no cause, or its cause is a passing line.
+// The checker says it loudly (issue 1901): a build module that sends such a failure does not keep the contract.
+func Hidden(f Failure) string {
+	c := strings.TrimSpace(f.Cause)
+	switch {
+	case c == "":
+		return "it sent no cause"
+	case PassingLine(c):
+		return fmt.Sprintf("its cause is a passing line (%q)", CutLine(c))
+	}
+	return ""
+}
+
+// Clip joins the last lines of a failure's output that fit OutputBytes, each cut to LineBytes, and says how many earlier
+// lines it left out. **Its first line is the cause**, put ahead when the kept lines do not start with it, or, with no
+// cause and lines left out, the first non-empty line, then the marker: an older checker reads only the first line.
+// Passing lines are dropped.
+func Clip(lines []string, cause string) string {
+	own := make([]string, 0, len(lines))
+	for _, l := range lines {
+		if !PassingLine(l) {
+			own = append(own, l)
+		}
+	}
+	lines = own
+	size, from := 0, len(lines)
+	for from > 0 {
+		n := len(CutLine(lines[from-1])) + 1
+		if size+n > OutputBytes && from < len(lines) {
+			break
+		}
+		size += n
+		from--
+	}
+	kept := make([]string, 0, len(lines)-from+2)
+	head := strings.TrimSpace(cause)
+	for i := 0; head == "" && i < from; i++ {
+		head = strings.TrimSpace(lines[i])
+	}
+	if head != "" && (from > 0 || len(lines) == 0 || strings.TrimSpace(lines[from]) != head) {
+		kept = append(kept, CutLine(head))
+	}
+	if from > 0 {
+		kept = append(kept, fmt.Sprintf("... (%d earlier lines)", from))
+	}
+	for _, l := range lines[from:] {
+		kept = append(kept, CutLine(l))
+	}
+	return strings.Join(kept, "\n")
+}
+
+// CutLine cuts a line to LineBytes, on a character boundary.
+func CutLine(l string) string {
+	if len(l) <= LineBytes {
+		return l
+	}
+	return strings.ToValidUTF8(l[:LineBytes], "") + "..."
+}
+
+// ConsoleFailure is the failure of a command that is no test runner (go vet, gofmt, tsc, a build script): its cause is the
+// first line that names an error (tsc's "error TS", go vet's "file.go:12:3: ..."), else the first line that is not a
+// heading ("# <package>", npm's "> script"), and its output the command's lines without passing ones.
+func ConsoleFailure(pkg, test, out string) Failure {
+	var lines []string
+	for _, l := range strings.Split(strings.ReplaceAll(stripANSI(out), "\r\n", "\n"), "\n") {
+		if t := strings.TrimSpace(l); t != "" && !PassingLine(t) {
+			lines = append(lines, strings.TrimRight(l, " \t"))
+		}
+	}
+	cause := ""
+	for _, l := range lines {
+		if t := strings.TrimSpace(l); strings.Contains(t, "error") || strings.Contains(t, "Error") || goPosition.MatchString(t) {
+			cause = t
+			break
+		}
+	}
+	for _, l := range lines {
+		if t := strings.TrimSpace(l); cause == "" && !strings.HasPrefix(t, "# ") && !strings.HasPrefix(t, "> ") && !strings.HasPrefix(t, "npm ") {
+			cause = t
+		}
+	}
+	if cause == "" {
+		cause = test + " failed and wrote nothing that says why"
+	}
+	cause = CutLine(cause)
+	return Failure{Package: pkg, Test: test, Cause: cause, Output: Clip(lines, cause)}
+}

go/buildstep/gotest.go

@@ -0,0 +1,409 @@
+package buildstep
+
+// The reader of `go test -json` (moved whole from mesh-catalog's mesh-build-go, issue 1901's thorough fix): per package
+// what ran and for how long, and each failure under the contract (failure.go), its real cause too when the failure is no
+// test's assertion (a panic, a timeout, a build error, an exit, a kill, a race).
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"slices"
+	"strings"
+)
+
+// GoPackage is one package's part of a Go test level.
+type GoPackage struct {
+	Dir     string  `json:"dir"`
+	Package string  `json:"package"`
+	Passed  bool    `json:"passed"`
+	Elapsed float64 `json:"elapsed"`
+	Tests   int     `json:"tests"`
+	// Skipped is how many of the package's tests skipped.
+	Skipped int `json:"skipped,omitempty"`
+	// NoTests is a package with no test files (at this level: a file with the other level's build tag is none).
+	NoTests bool `json:"no_tests,omitempty"`
+}
+
+// TestTime is one test and the seconds it took.
+type TestTime struct {
+	Package string  `json:"package"`
+	Test    string  `json:"test"`
+	Elapsed float64 `json:"elapsed"`
+}
+
+// GoTest is what one go.mod directory's `go test -json` said.
+type GoTest struct {
+	Packages []GoPackage
+	Tests    int
+	Skipped  int
+	Times    []TestTime
+	Failed   []Failure
+	// Elapsed is the slowest package's running time in seconds.
+	Elapsed float64
+	// Noise is the lines that were no event: what go said when it could not run the tests at all.
+	Noise []string
+}
+
+// ReadGoTest reads the output of `go test -json` run in the go.mod directory dir.
+func ReadGoTest(out, dir string) GoTest {
+	r := &goReader{dir: dir, pkgs: map[string]*GoPackage{}, builds: map[string][]string{}, pkgOut: map[string][]string{},
+		testOut: map[string][]string{}, causes: map[string]string{}, failedIn: map[string]bool{},
+		running: map[string][]string{}, passed: map[string]bool{}, built: map[string]bool{}}
+	sc := bufio.NewScanner(strings.NewReader(out))
+	sc.Buffer(make([]byte, 1<<20), 1<<26)
+	for sc.Scan() {
+		var ev goEvent
+		if err := json.Unmarshal(sc.Bytes(), &ev); err != nil {
+			if l := strings.TrimSpace(sc.Text()); l != "" {
+				r.res.Noise = append(r.res.Noise, l)
+			}
+			continue
+		}
+		r.event(ev)
+	}
+	r.finish()
+	return r.res
+}
+
+// goEvent is one line of `go test -json` (test2json, and the build events go test adds).
+type goEvent struct {
+	Action      string
+	Package     string
+	Test        string
+	Output      string
+	OutputType  string // "error" for a t.Error or t.Fatal message, "error-continue" for its further lines
+	ImportPath  string
+	FailedBuild string
+	Elapsed     float64
+}
+
+type goReader struct {
+	res      GoTest
+	dir      string
+	pkgs     map[string]*GoPackage
+	order    []string
+	builds   map[string][]string // build output by import path
+	pkgOut   map[string][]string
+	testOut  map[string][]string // by package + "\x00" + test
+	causes   map[string]string   // the first error line of a test, by the same key
+	failedIn map[string]bool     // packages with a failed test
+	// running is the tests that started and have not ended, by package, in the order they started: when a package
+	// fails with no failed test, these were running when its test program stopped.
+	running map[string][]string
+	// passed says a package's test program printed "PASS" before it failed; built says it failed to build.
+	passed, built map[string]bool
+}
+
+func (r *goReader) pkg(name string) *GoPackage {
+	p := r.pkgs[name]
+	if p == nil {
+		p = &GoPackage{Dir: r.dir, Package: name}
+		r.pkgs[name] = p
+		r.order = append(r.order, name)
+	}
+	return p
+}
+
+func keepLine(lines []string, out string) []string {
+	if t := strings.TrimRight(out, "\r\n"); t != "" && !strings.HasPrefix(t, "=== ") {
+		lines = append(lines, t)
+	}
+	return lines
+}
+
+func (r *goReader) event(ev goEvent) {
+	switch {
+	case ev.Package == "" && ev.ImportPath != "":
+		if ev.Action == "build-output" {
+			r.builds[ev.ImportPath] = keepLine(r.builds[ev.ImportPath], ev.Output)
+		}
+	case ev.Package == "":
+	case ev.Test == "":
+		p := r.pkg(ev.Package)
+		switch ev.Action {
+		case "output":
+			// go test's own summary of a package is never a failure's words: a "PASS" before a "FAIL <pkg>" says only
+			// that the tests passed and the program failed after them.
+			switch l := strings.TrimRight(ev.Output, "\r\n"); {
+			case l == "PASS":
+				r.passed[ev.Package] = true
+			case goSummaryLine(l):
+			default:
+				r.pkgOut[ev.Package] = keepLine(r.pkgOut[ev.Package], ev.Output)
+			}
+		case "pass":
+			p.Passed, p.Elapsed = true, ev.Elapsed
+		case "fail":
+			p.Passed, p.Elapsed = false, ev.Elapsed
+			if ev.FailedBuild != "" {
+				r.built[ev.Package] = true
+				r.pkgOut[ev.Package] = append(r.builds[ev.FailedBuild], r.pkgOut[ev.Package]...)
+			}
+		case "skip":
+			p.Passed, p.NoTests = true, true
+		}
+	default:
+		key := ev.Package + "\x00" + ev.Test
+		switch ev.Action {
+		case "output":
+			r.testOut[key] = keepLine(r.testOut[key], ev.Output)
+			if ev.OutputType == "error" && r.causes[key] == "" {
+				r.causes[key] = goErrorWords(ev.Output)
+			}
+		case "run":
+			r.running[ev.Package] = append(r.running[ev.Package], ev.Test)
+		case "pass", "fail", "skip":
+			r.running[ev.Package] = slices.DeleteFunc(r.running[ev.Package], func(t string) bool { return t == ev.Test })
+			p := r.pkg(ev.Package)
+			p.Tests++
+			r.res.Tests++
+			if ev.Action == "skip" {
+				r.res.Skipped++
+				p.Skipped++
+			}
+			r.res.Times = append(r.res.Times, TestTime{Package: ev.Package, Test: ev.Test, Elapsed: ev.Elapsed})
+			if ev.Action == "fail" {
+				r.failedIn[ev.Package] = true
+				if r.subtestFailed(ev.Package, ev.Test) {
+					return // a parent failed only by its subtest is that subtest's failure, said once
+				}
+				if r.subtestTakesTheCause(ev.Package, ev.Test) {
+					return // a subtest's panic, which go files under its parent, is said on the subtest
+				}
+				r.res.Failed = append(r.res.Failed, r.testFailure(ev.Package, ev.Test))
+			}
+		}
+	}
+}
+
+// subtestFailed says a failure of test under pkg was already reported for one of its subtests (they end first), each with
+// a cause of its own, and the test reported no error and no runtime cause (a subtest's panic) of its own.
+func (r *goReader) subtestFailed(pkg, test string) bool {
+	key := pkg + "\x00" + test
+	if r.causes[key] != "" || goRuntimeCause(r.testOut[key]) != "" {
+		return false
+	}
+	for _, f := range r.res.Failed {
+		if f.Package == pkg && strings.HasPrefix(f.Test, test+"/") {
+			return true
+		}
+	}
+	return false
+}
+
+// noMessage is the cause of a test that failed and said nothing of why.
+const noMessage = "the test failed without an error message (t.Fail or t.FailNow)"
+
+// subtestTakesTheCause gives a parent's runtime cause (a subtest's panic: go test -json files its lines under the
+// parent) to the subtests of that parent that failed with no message of their own, and says it did. A parent with an
+// error line of its own, or whose failed subtests each said why, is reported as itself.
+func (r *goReader) subtestTakesTheCause(pkg, test string) bool {
+	key := pkg + "\x00" + test
+	if r.causes[key] != "" {
+		return false
+	}
+	cause := goRuntimeCause(r.testOut[key])
+	if cause == "" {
+		return false
+	}
+	took := false
+	for i, f := range r.res.Failed {
+		if f.Package == pkg && strings.HasPrefix(f.Test, test+"/") && f.Cause == noMessage {
+			r.res.Failed[i].Cause, r.res.Failed[i].Output = cause, Clip(r.testOut[key], cause)
+			took = true
+		}
+	}
+	return took
+}
+
+// testFailure is a test that failed: its cause is its first error line, the race it ran into, the runtime's line, or
+// words saying it failed without a message.
+func (r *goReader) testFailure(pkg, test string) Failure {
+	key := pkg + "\x00" + test
+	cause := r.causes[key]
+	if race := goRaceCause(r.testOut[key]); race != "" && (cause == "" || strings.HasPrefix(cause, "race detected")) {
+		cause = race // the race itself, not testing's "race detected during execution of test"
+	} else if cause == "" {
+		cause = goRuntimeCause(r.testOut[key])
+	}
+	if cause == "" {
+		cause = noMessage
+	}
+	return Failure{Package: pkg, Test: test, Output: Clip(r.testOut[key], cause), Cause: cause}
+}
+
+// goSummaryLine says a line is go test's summary of a package, in go's exact forms only: "PASS" or "FAIL" alone,
+// "ok  \t<pkg>\t<time>" and "FAIL\t<pkg>\t<time>" (a line of the package's own that starts "ok " is kept).
+func goSummaryLine(l string) bool {
+	return l == "PASS" || l == "FAIL" || strings.HasPrefix(l, "ok  \t") || strings.HasPrefix(l, "FAIL\t")
+}
+
+// goRuntimeCause is the cause in a failure's output that is not a test's assertion: a race the race detector reported;
+// else the first "panic:" line, a timeout's with the tests it names as running; else the first "fatal error:" or
+// "signal:" line; "" when there is none. It reads every line, so a long goroutine dump cannot hide it. **It matches only
+// lines at column 0**, where go prints the runtime's: a test's indented log line holding the same words is not the cause.
+func goRuntimeCause(lines []string) string {
+	if race := goRaceCause(lines); race != "" {
+		return race
+	}
+	for _, prefix := range []string{"panic: ", "fatal error: ", "signal: "} {
+		for i, l := range lines {
+			l = strings.TrimRight(l, "\r\n")
+			if !strings.HasPrefix(l, prefix) {
+				continue
+			}
+			if strings.HasPrefix(l, "panic: test timed out after") {
+				var names []string
+				for _, n := range lines[i+1:] {
+					if !strings.HasPrefix(n, "\t\t") {
+						if strings.TrimSpace(n) == "running tests:" {
+							continue
+						}
+						break
+					}
+					names = append(names, strings.TrimSpace(n))
+				}
+				if len(names) > 0 {
+					l += "; running tests: " + strings.Join(names, ", ")
+				}
+			}
+			return CutLine(l)
+		}
+	}
+	return ""
+}
+
+// goRaceCause is the first race the race detector reported in a failure's output, in one line: its access and the frame
+// that made it, and where the goroutine that made it was created. "" when the output holds no race.
+func goRaceCause(lines []string) string {
+	at := -1
+	for i, l := range lines {
+		if strings.TrimRight(l, "\r\n") == "WARNING: DATA RACE" {
+			at = i
+			break
+		}
+	}
+	if at < 0 {
+		return ""
+	}
+	frame := func(i int) string {
+		var fn, file string
+		for _, l := range lines[i+1:] {
+			if l = strings.TrimSpace(l); l == "" {
+				break
+			}
+			if fn == "" {
+				fn = l
+				continue
+			}
+			file = l
+			if j := strings.LastIndexByte(file, '/'); j >= 0 {
+				file = file[j+1:]
+			}
+			if j := strings.Index(file, " +0x"); j >= 0 {
+				file = file[:j]
+			}
+			break
+		}
+		if file != "" {
+			return fn + " (" + file + ")"
+		}
+		return fn
+	}
+	words := "WARNING: DATA RACE"
+	for i := at + 1; i < len(lines); i++ {
+		l := strings.TrimSpace(lines[i])
+		if l == "" || strings.HasPrefix(l, "===") {
+			continue
+		}
+		words += ": " + strings.TrimSuffix(l, ":")
+		if f := frame(i); f != "" {
+			words += " in " + f
+		}
+		break
+	}
+	for i := at + 1; i < len(lines); i++ {
+		l := strings.TrimSpace(lines[i])
+		if strings.HasPrefix(l, "==================") {
+			break
+		}
+		if strings.HasPrefix(l, "Goroutine ") && strings.HasSuffix(l, " created at:") {
+			if f := frame(i); f != "" {
+				words += "; its goroutine created at " + f
+			}
+			break
+		}
+	}
+	return CutLine(words)
+}
+
+// goBuildCause is the first error line of a failed build: the first line that is not go's "# <package>" heading.
+func goBuildCause(lines []string) string {
+	for _, l := range lines {
+		if l = strings.TrimSpace(l); l != "" && !strings.HasPrefix(l, "# ") {
+			return CutLine(l)
+		}
+	}
+	return ""
+}
+
+// goTestNames names the tests that were running, at most three, and how many more.
+func goTestNames(tests []string) string {
+	if len(tests) <= 3 {
+		return strings.Join(tests, ", ")
+	}
+	return fmt.Sprintf("%s and %d more", strings.Join(tests[:3], ", "), len(tests)-3)
+}
+
+// packageFailure is a package that failed with no failed test to name it: its test program did not build, panicked,
+// timed out, was killed or exited. It names the tests that were running, keeps their output with the package's, and
+// says the cause.
+func (r *goReader) packageFailure(name string) Failure {
+	running := r.running[name]
+	var lines []string
+	for _, t := range running {
+		lines = append(lines, r.testOut[name+"\x00"+t]...)
+	}
+	lines = append(lines, r.pkgOut[name]...)
+	cause := goRuntimeCause(lines)
+	switch {
+	case cause != "":
+	case r.built[name]:
+		cause = goBuildCause(lines)
+	case len(running) > 0:
+		cause = "the test program exited while " + goTestNames(running) + " ran, with no panic: an os.Exit or a signal (go test -json reports no exit status)"
+	case r.passed[name]:
+		cause = "the tests passed, then the test program exited with a failure: an os.Exit or a panic in TestMain or after the tests (go test -json reports no exit status)"
+	}
+	if cause == "" {
+		cause = "the package failed with no test to name and no panic, signal or build error in its output"
+	}
+	return Failure{Package: name, Test: goTestNames(running), Output: Clip(lines, cause), Cause: cause}
+}
+
+var goFileAndLine = regexp.MustCompile(`^\S+\.go:\d+: `)
+
+// goPosition matches a line that starts with a Go file's position, as go vet and the compiler write an error.
+var goPosition = regexp.MustCompile(`^\S+\.go:\d+(:\d+)?: `)
+
+// goErrorWords is the words of an error line of a test: trimmed, without the file and line go test put before them.
+func goErrorWords(out string) string {
+	return strings.TrimSpace(goFileAndLine.ReplaceAllString(strings.TrimSpace(out), ""))
+}
+
+// finish moves what was read into the result: the packages in order, a failure for each failed package that has no
+// failed test to name it.
+func (r *goReader) finish() {
+	for _, name := range r.order {
+		p := r.pkgs[name]
+		if !p.Passed && !r.failedIn[name] {
+			r.res.Failed = append(r.res.Failed, r.packageFailure(name))
+		}
+		if !p.NoTests && p.Elapsed > r.res.Elapsed {
+			r.res.Elapsed = p.Elapsed
+		}
+		r.res.Packages = append(r.res.Packages, *p)
+	}
+}

go/buildstep/launchers.go

@@ -1,24 +1,14 @@
 package buildstep
 
-import "strings"
+import "git.novox.be/novox/mesh-sdk/go/catalogue"
 
 // LauncherSuffix is what a TypeScript entrypoint's launcher is called beside it: index.js is started as
 // index.serve.mjs (novox/hq ADR 0193), an ES module by its own extension whatever the bundle's package.json says.
-const LauncherSuffix = ".serve.mjs"
+const LauncherSuffix = catalogue.LauncherSuffix
 
-// Launchers are the launchers a bundle's build writes, by entrypoint, relative to the bundle's root: for TypeScript
-// every entrypoint `x.js` is started by `x.serve.mjs` beside it; an entrypoint that is not JavaScript and every other
-// language, whose build is already executable, get none. The one rule mesh-build-node, build-agent and the controller
-// share (R4e), so the name a build writes is the name a reader expects.
+// Launchers are the launchers a bundle's build writes, by entrypoint, relative to the bundle's root
+// (catalogue.Launchers): the one rule mesh-build-node, build-agent, the controller and a node taking in a build share
+// (R4e, issue 1126), so the name a build writes is the name a reader expects.
 func Launchers(language string, entrypoints []string) map[string]string {
-	out := map[string]string{}
-	if language != "typescript" {
-		return out
-	}
-	for _, entry := range entrypoints {
-		if strings.HasSuffix(entry, ".js") {
-			out[entry] = strings.TrimSuffix(entry, ".js") + LauncherSuffix
-		}
-	}
-	return out
+	return catalogue.Launchers(language, entrypoints)
 }

go/buildstep/phase.go

@@ -9,7 +9,7 @@ import (
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
-// **A running ask says its phases** (issue 1890, 2026-10-26 19:09: a mesh-catalog try's step on shanks ran 30 minutes
+// **A running ask says its phases** (issue 1890, 2026-10-26 19:09: a mesh-catalog try's step on the workstation ran 30 minutes
 // and its module's journal held no line naming its ask, so nobody could tell whether it fetched, linted or tested). The
 // puller hands every ask's run a phase reporter in its context; RunAsk and a module's own step bodies call Phase as they
 // move (fetch and merge, a level's digest, lint, a level's tests), and each phase is logged with the ask's id and its

go/buildstep/pull.go

@@ -86,6 +86,13 @@ type Puller struct {
 	// mesh-config resolves for `build-hours` takes its place once handed. Outside the window the capacity judged by is 0:
 	// steps running finish, no new one is taken; the puller wakes at the window's next edge. Nil builds at any hour.
 	BuildHours func() (*BuildWindow, string)
+	// Eligible says why this node cannot run the seat's asks at all now, and "" when it can: what the module proves of
+	// its machine and finds missing (mesh-build-image: /dev/net/tun cannot be opened, so buildah's network for a RUN line
+	// cannot be made; 2026-10-28 on ace). Read at every judgement, so it is cheap (a module answers its last look).
+	// While it says a reason the capacity judged by is 0, said with the reason: steps running finish, no new one is
+	// taken, and the asks go to a node that can run them instead of failing here. The module calls Wake when its answer
+	// changes. Nil is always eligible.
+	Eligible func() string
 	// Has says whether this node has a need an ask names (delivery.AskNeeds, issue 890). An ask needing what it lacks is
 	// declined: its step ends refused as declined (delivery.StepDeclined), the message is dropped for its asker to put
 	// again, and the worker it came from is not looked at again until the next pull's wait, so a node lacking the need
@@ -291,6 +298,13 @@ func (p *Puller) CapacityDetail() delivery.Capacity {
 			c.Why = fmt.Sprintf("%s; within its build hours %s until %s", c.Why, c.BuildHours, w.NextEdge(at).Format("15:04"))
 		}
 	}
+	if p.Eligible != nil {
+		if why := p.Eligible(); why != "" {
+			c.Ineligible = why
+			c.Why = fmt.Sprintf("0, not eligible: %s (otherwise %s)", why, c.Why)
+			c.Effective = 0
+		}
+	}
 	p.sayCapacity(c)
 	return c
 }
@@ -326,7 +340,8 @@ func (p *Puller) sayCapacity(c delivery.Capacity) {
 	p.mu.Lock()
 	same := p.hasJudged && p.judged.Effective == c.Effective && p.judged.Configured == c.Configured && p.judged.ByCPU == c.ByCPU &&
 		p.judged.CoresPerStep == c.CoresPerStep && p.judged.QuotaCores == c.QuotaCores && p.judged.OutsideHours == c.OutsideHours &&
-		p.judged.BuildHours == c.BuildHours && p.judged.BuildHoursFault == c.BuildHoursFault
+		p.judged.BuildHours == c.BuildHours && p.judged.BuildHoursFault == c.BuildHoursFault &&
+		p.judged.Ineligible == c.Ineligible
 	if !same {
 		p.judged, p.hasJudged, p.capWritten = c, true, false
 	}
@@ -595,7 +610,7 @@ func (p *Puller) run(ctx context.Context, msg *Pulled, ask delivery.StepAsk, key
 	}
 }
 
-// watchCapacity follows the module's config value `capacity` when WatchConfig is set (issue 1887, 2026-10-25: g14's
+// watchCapacity follows the module's config value `capacity` when WatchConfig is set (issue 1887, 2026-10-25: the laptop's
 // puller started at capacity 0 sat parked with capacity 2 set, because nothing woke it to read its settings file
 // again). The value comes as mesh-config resolved it for this node, the event of the change itself: the runtime hands
 // the value now and then each change its machine's provisioner client says moved, so nothing polls, and the puller does
@@ -644,7 +659,7 @@ func (p *Puller) watchHours() {
 			why = fmt.Sprintf("the setting %s %s is not a string", BuildHoursSetting, c.Value)
 		default:
 			var err error
-			if w, err = ParseBuildHours(setting, p.Node); err != nil {
+			if w, err = ParseBuildWindow(setting); err != nil {
 				why = err.Error()
 			}
 		}
@@ -674,13 +689,7 @@ func (p *Puller) capacityFrom(c stdio.ProvisionChange) (int, string) {
 	if c.Refused != "" {
 		return 0, "its capacity is no longer answered: " + c.Refused
 	}
-	setting := ""
-	if len(c.Value) > 0 && string(c.Value) != "null" {
-		if err := json.Unmarshal(c.Value, &setting); err != nil {
-			return 0, fmt.Sprintf("its capacity %s is not a string", c.Value)
-		}
-	}
-	n, err := capacityOf(setting, p.Node)
+	n, err := capacityOf(c.Value)
 	if err != nil {
 		return 0, err.Error()
 	}

go/buildstep/pull_capacity_test.go

@@ -22,7 +22,7 @@ func (w *configWatch) watch(key string, handle func(stdio.ProvisionChange) error
 	w.asked, w.handle = key, handle
 	value := w.value
 	w.mu.Unlock()
-	return handle(stdio.ProvisionChange{Kind: "config", Key: key, Value: json.RawMessage(`"` + value + `"`)})
+	return handle(stdio.ProvisionChange{Kind: "config", Key: key, Value: json.RawMessage(value)})
 }
 
 func (w *configWatch) set(t *testing.T, value string) {
@@ -33,7 +33,7 @@ func (w *configWatch) set(t *testing.T, value string) {
 	if handle == nil {
 		t.Fatal("the puller watches no config value")
 	}
-	if err := handle(stdio.ProvisionChange{Kind: "config", Key: key, Value: json.RawMessage(`"` + value + `"`)}); err != nil {
+	if err := handle(stdio.ProvisionChange{Kind: "config", Key: key, Value: json.RawMessage(value)}); err != nil {
 		t.Fatal(err)
 	}
 }

go/buildstep/pull_test.go

@@ -166,7 +166,7 @@ func TestPullHoldsAtMostItsCapacity(t *testing.T) {
 	waitFor(t, "a phase on the step key", func() bool {
 		key, _ := delivery.AskStepKey("shanks", p.Running()[0].ID)
 		s, _ := st.get(key)
-		return s.State == delivery.StepRunning && s.Phase == "unit: tests of 3 packages" && !s.PhaseAt.IsZero()
+		return s.State == delivery.StepRunning && s.Phase == "unit: tests of 3 packages" && !s.PhaseAt.IsZero() && s.Owner == Owner // 1890/AC5
 	})
 	release <- struct{}{}
 	waitFor(t, "the third taken", func() bool { return src.Waiting(delivery.AskDelivery) == 0 })
@@ -176,7 +176,7 @@ func TestPullHoldsAtMostItsCapacity(t *testing.T) {
 	waitFor(t, "all acked", func() bool { a, _, _ := src.Fates(); return len(a) == 3 })
 	for _, a := range asks {
 		key, _ := delivery.AskStepKey("shanks", a.ID)
-		if s, _ := st.get(key); s.State != delivery.StepPassed || s.Phase != "unit: tests of 3 packages" {
+		if s, _ := st.get(key); s.State != delivery.StepPassed || s.Phase != "unit: tests of 3 packages" || s.Owner != Owner {
 			t.Errorf("the end of %s = %+v, want passed in its last phase", a.ID, s)
 		}
 	}
@@ -282,7 +282,7 @@ func TestPullAtCapacityZeroTakesNothing(t *testing.T) {
 	t.Run("config watch wakes", func(t *testing.T) {
 		src, st := NewFakeAsks(), newSteps()
 		_ = src.PublishAsk(testAsk(delivery.AskDelivery))
-		w := &configWatch{value: "shanks=3,g14=0"}
+		w := &configWatch{value: "0"}
 		p := &Puller{Source: src, Language: delivery.AskGo, Node: "g14", Put: st.put, PullWait: 10 * time.Millisecond,
 			Capacity:    func() int { return 0 }, // the settings file, not refilled yet
 			WatchConfig: w.watch,
@@ -298,7 +298,7 @@ func TestPullAtCapacityZeroTakesNothing(t *testing.T) {
 		if w.asked != CapacitySetting {
 			t.Fatalf("the puller watches %q, want %q", w.asked, CapacitySetting)
 		}
-		w.set(t, "shanks=3,g14=2")
+		w.set(t, "2")
 		waitFor(t, "the ask taken once the capacity moved to 2", func() bool { a, _, _ := src.Fates(); return len(a) == 1 })
 	})
 	for _, c := range []struct {

go/buildstep/stale.go

@@ -5,6 +5,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -14,40 +16,82 @@ import (
 
 // **A step left running** (novox/hq issue 1890, note 5). A build module that stops while a step runs leaves its key in
 // state running for good: nothing else writes that key's end, and the stream's redelivery only rewrites it when the same
-// ask comes back. At its start a module ends the steps its node left running before the process began (EndStale), and
-// its step-end tool ends one by hand (EndOne).
+// ask comes back. At its start a module ends the steps its node left running by another process (EndStale: every step
+// names its owner, delivery.Step.Owner; note 21), and its step-end tool ends one by hand (EndOne). The conformance kit's
+// left-running case holds every build module to the start sweep (conformance.LeftRunning).
 
 // RestartReason is why a step a previous process left running is ended.
 const RestartReason = "the build module restarted while it ran"
 
-// Boot is when this process began. A step started at or after it belongs to this process, which may still run it, so
-// EndOne refuses it.
+// Boot is when this process began. A step with no owner (written by an older build) started at or after it is taken
+// for this process's, which may still run it, so EndOne refuses it.
 var Boot = time.Now()
 
+// Owner is this process as a step's owner (delivery.Step.Owner): `<boot id>.<pid>.<start>`, the node's boot id
+// (/proc/sys/kernel/random/boot_id), the pid and Boot in milliseconds, base 36. The start keeps two processes apart
+// that a reboot or a pid namespace gave the same pid. A running step whose owner is another is a previous process's.
+var Owner = ownerOf(bootID, os.Getpid(), Boot)
+
+// bootID is the node's boot id as Owner holds it; noBootID when it could not be read, which EndStaleAtStart says once.
+var bootID = readBootID()
+
+const noBootID = "no-boot-id"
+
+func ownerOf(bootID string, pid int, start time.Time) string {
+	return bootID + "." + strconv.Itoa(pid) + "." + strconv.FormatInt(start.UnixMilli(), 36)
+}
+
+// readBootID is the node's boot id, or noBootID where it cannot be read (the pid and the start then tell the processes
+// apart).
+func readBootID() string {
+	b, err := os.ReadFile("/proc/sys/kernel/random/boot_id")
+	if id := strings.TrimSpace(string(b)); err == nil && id != "" {
+		return id
+	}
+	return noBootID
+}
+
 // Scan reads and writes a steps state with its revisions: its keys, a key's stored value and revision (nil and 0 for
-// none), and a write that lands only while the key is still at the revision read (KeptState.Update), failing with
-// stdio.ErrChanged when another writer was first.
+// none), a write that lands only while the key is still at the revision read (KeptState.Update), and a delete of a key
+// still at the revision read; both fail with stdio.ErrChanged when another writer was first.
 type Scan struct {
 	Keys   func() ([]string, error)
 	Get    func(key string) (json.RawMessage, uint64, error)
 	Update func(key string, value any, revision uint64) (uint64, error)
+	Delete func(key string, revision uint64) error
 }
 
 // ScanOf is the Scan of a state the process keeps.
+//
+// Its Delete reads the key again and deletes it only while it is still at the revision read: the runtime's
+// mesh/state.delete takes no revision yet, so a write landing between that read and the delete (a few milliseconds) is
+// deleted with it. For a step key that is a redelivered ask begun on this node in that moment: its running key leaves
+// the steps state until its run writes its end, which its asker still reads (a watch takes puts only).
 func ScanOf(s stdio.KeptState) Scan {
-	return Scan{Keys: s.Keys, Update: s.Update, Get: func(key string) (json.RawMessage, uint64, error) {
+	get := func(key string) (json.RawMessage, uint64, error) {
 		e, err := s.Get(key)
 		if err != nil || e == nil {
 			return nil, 0, err
 		}
 		return e.Value, e.Revision, nil
+	}
+	return Scan{Keys: s.Keys, Update: s.Update, Get: get, Delete: func(key string, revision uint64) error {
+		_, rev, err := get(key)
+		if err != nil {
+			return err
+		}
+		if rev != revision {
+			return stdio.ErrChanged
+		}
+		return s.Delete(key)
 	}}
 }
 
 // isAsk says a step is a pulled ask's: its key is <node>.<ask id> and its tool is "<kind> ask" (a hand-started step
 // has the tool's name). An ask's key is the stream's to settle, never a restart's: the puller leaves an ask it was
 // running unacknowledged so the stream redelivers it, and the asker's wait takes the first end it reads on the key.
-// Only once the asker's bound has passed (delivery.StepBound) is the key nobody's, and then it is ended.
+// A key a gone process owns is deleted, never ended (EndStale); one with no owner is ended only once the asker's bound
+// has passed (delivery.StepBound), when it is nobody's.
 func isAsk(key string, s delivery.Step) bool {
 	_, _, err := delivery.ParseAskStepKey(key)
 	return err == nil && strings.HasSuffix(s.Tool, " ask")
@@ -95,11 +139,23 @@ func endRunning(scan Scan, key string, step delivery.Step, revision uint64, why
 	return err
 }
 
-// EndStale ends this node's steps that are running and started before `before` (the start of this process) as failed
-// with RestartReason, and answers their ids. Only keys of node are read; a value that is no step is left alone. A step
-// of a pulled ask is left to the stream's redelivery (isAsk) until its start is older than delivery.StepBound: its asker
-// stopped waiting then, whether the stream gave it to another node or gave it up, and it is ended as failed, "past the
-// step bound: its asker stopped waiting at <time>". A key written by another writer since it was read
+// EndStale ends this node's running steps that no process of this module runs any more, and answers their ids. Only keys
+// of node are read; a value that is no step is left alone.
+//   - A hand-started step with an owner (delivery.Step.Owner) that is not this process (Owner) is ended failed with
+//     RestartReason at once, whatever its age: its process is gone and nothing redelivers it, so nothing else would
+//     write its end (issue 1890, note 21).
+//   - A pulled ask's step with an owner that is not this process is deleted, not ended (novox/hq ADR 0525 §6): the
+//     stream redelivers an ask whose node stopped (the puller neither ends nor acknowledges one at its stop), and its
+//     asker takes the first end it reads, so an end written here would fail a check the redelivery would still run. Its
+//     asker's watch takes puts only and keeps waiting for the redelivery's key, its bound the backstop; the stale running
+//     key leaves the steps state, and with it the delivery view's and the checker's count of what runs (note 21: it
+//     held one of a build node's two slots).
+//   - A step owned by this process is left: it may run now. A redelivered ask begun on this node is owned by it.
+//   - A step with no owner (written by an older build) keeps the earlier rule: a hand-started step started before
+//     `before` (the start of this process) is ended; a pulled ask is left to the stream's redelivery (isAsk) until its
+//     start is older than delivery.StepBound, and then ended "past the step bound: its asker stopped waiting at <time>".
+//
+// Each end and delete is logged, naming the step, its owner and why. A key written by another writer since it was read
 // (a redelivered ask's start, a real end) is skipped.
 func EndStale(scan Scan, node string, before time.Time, logf func(string, ...any)) ([]string, error) {
 	keys, err := scan.Keys()
@@ -123,32 +179,59 @@ func EndStale(scan Scan, node string, before time.Time, logf func(string, ...any
 		if err != nil || step.State != delivery.StepRunning {
 			continue
 		}
-		why := RestartReason
-		if isAsk(k, step) {
-			if !step.Started.Add(delivery.StepBound).Before(now()) {
-				continue
-			}
-			why = "past the step bound: its asker stopped waiting at " + step.Started.Add(delivery.StepBound).UTC().Format("2006-01-02T15:04:05Z")
-		} else if !step.Started.Before(before) {
+		why, said := staleWhy(k, step, before)
+		if why == "" {
 			continue
 		}
-		if err := endRunning(scan, k, step, rev, why); err != nil {
+		done := "ended"
+		if step.Owner != "" && isAsk(k, step) {
+			done = "deleted, left to the stream's redelivery"
+			if scan.Delete == nil {
+				err = fmt.Errorf("the steps state takes no delete")
+			} else {
+				err = scan.Delete(k, rev)
+			}
+		} else {
+			err = endRunning(scan, k, step, rev, why)
+		}
+		if err != nil {
 			if errors.Is(err, stdio.ErrChanged) {
 				continue
 			}
 			return ended, fmt.Errorf("buildstep: ending the step %s: %w", k, err)
 		}
 		if logf != nil {
-			logf("the step %s (%s) was left running and is ended: %s", k, step.Tool, why)
+			logf("the step %s (%s, started %s) was left running and is %s: %s; %s", k, step.Tool,
+				step.Started.UTC().Format(time.RFC3339), done, why, said)
 		}
 		ended = append(ended, step.ID)
 	}
 	return ended, nil
 }
 
+// staleWhy is why a running step is ended (or, for an ask with an owner, deleted) by EndStale and what the log says of
+// its owner, or "" to leave it.
+func staleWhy(key string, step delivery.Step, before time.Time) (why, said string) {
+	switch {
+	case step.Owner == Owner:
+		return "", ""
+	case step.Owner != "":
+		return RestartReason, "its owner " + step.Owner + " is not this process " + Owner
+	case isAsk(key, step):
+		if !step.Started.Add(delivery.StepBound).Before(now()) {
+			return "", ""
+		}
+		return "past the step bound: its asker stopped waiting at " + step.Started.Add(delivery.StepBound).UTC().Format("2006-01-02T15:04:05Z"),
+			"it names no owner (an older build wrote it)"
+	case step.Started.Before(before):
+		return RestartReason, "it names no owner (an older build wrote it) and started before this process"
+	}
+	return "", ""
+}
+
 // EndOne ends this node's running step id (or the key <node>.<id>) as failed with why. A step that is not running is
-// refused, and so is one started since this process began (Boot: it may still run, whether a pulled ask or a step a
-// tool started), one live reports as held, and one whose key changed since it was read.
+// refused, and so is one this process owns (Owner; for a step with no owner, one started since Boot: it may still run,
+// whether a pulled ask or a step a tool started), one live reports as held, and one whose key changed since it was read.
 func EndOne(scan Scan, node, id, why string, live func(id string) bool) (delivery.Step, error) {
 	id = strings.TrimSpace(id)
 	if n, rest, ok := strings.Cut(id, "."); ok {
@@ -178,7 +261,7 @@ func EndOne(scan Scan, node, id, why string, live func(id string) bool) (deliver
 	if step.State != delivery.StepRunning {
 		return delivery.Step{}, fmt.Errorf("the step %s is %s, not running", key, step.State)
 	}
-	if !step.Started.Before(Boot) || (live != nil && live(id)) {
+	if step.Owner == Owner || (step.Owner == "" && !step.Started.Before(Boot)) || (live != nil && live(id)) {
 		return delivery.Step{}, fmt.Errorf("the step %s was started by this process and may run now; only a step a previous process left is ended", key)
 	}
 	if err := endRunning(scan, key, step, rev, why); err != nil {
@@ -226,14 +309,24 @@ var (
 	StaleRetry    = 5 * time.Second
 )
 
+// StaleServed is what EndStaleAtStart waits for before it reads the steps state: the runtime serving (stdio.Served).
+// The conformance kit's left-running case (conformance.LeftRunning) hands it a closed channel, to run a module's own
+// start sweep in its test.
+var StaleServed = stdio.Served
+
 // EndStaleAtStart is what a build module runs once at its start, in a goroutine: it waits for the runtime to serve,
-// then ends this node's steps left running before `before` (EndStale), trying again when the state cannot be read yet.
-// A step this process starts is never one of them: it starts after `before`.
+// then ends this node's steps a previous process left running (EndStale), trying again when the state cannot be read
+// yet. A step names its owner, so `before` (the start of this process) matters only for a step with no owner, written
+// by an older build: such a step started before it is a previous process's. When the node's boot id cannot be read it
+// says so once: Owner then tells processes apart by their pid and start only.
 func EndStaleAtStart(ctx context.Context, scan Scan, node string, before time.Time, logf func(string, ...any)) {
 	select {
 	case <-ctx.Done():
 		return
-	case <-stdio.Served():
+	case <-StaleServed():
+	}
+	if bootID == noBootID && logf != nil {
+		logf("the boot id of %s cannot be read (/proc/sys/kernel/random/boot_id): its steps' owner is %s, told apart by pid and start only", node, Owner)
 	}
 	for attempt := 1; ; attempt++ {
 		ended, err := EndStale(scan, node, before, logf)

go/buildstep/stale_test.go

@@ -2,6 +2,7 @@ package buildstep
 
 import (
 	"encoding/json"
+	"fmt"
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"strings"
 	"testing"
@@ -33,6 +34,15 @@ func scanOf(k *keys, race func(key string)) Scan {
 			raw, err := delivery.EncodeStep(s[len(s)-1])
 			return raw, uint64(len(s)), err
 		},
+		Delete: func(key string, revision uint64) error {
+			k.mu.Lock()
+			defer k.mu.Unlock()
+			if uint64(len(k.puts[key])) != revision {
+				return stdio.ErrChanged
+			}
+			delete(k.puts, key)
+			return nil
+		},
 		Update: func(key string, value any, revision uint64) (uint64, error) {
 			if race != nil {
 				race(key)
@@ -48,65 +58,85 @@ func scanOf(k *keys, race func(key string)) Scan {
 	}
 }
 
-// 1890: EndStale ends only this node's hand-started steps left running before the process began and the asks past the
-// step bound (a younger ask is the stream's to redeliver), and never a key written meanwhile; EndOne ends one by hand, never one this process started.
+// 1890 and 1890/AC6: EndStale ends this node's hand-started running steps of another owner at once, whatever their age,
+// and deletes its asks of another owner (the stream redelivers them, ADR 0525 §6); of
+// the steps with no owner (an older build's), the hand-started ones left running before the process began and the asks
+// past the step bound (a younger ask is the stream's to redeliver); never a step this process owns or a key written
+// meanwhile. EndOne ends one by hand, never one this process owns or started.
 func TestEndStaleAndEndOne(t *testing.T) {
 	k := newKeys()
 	boot := time.Now()
 	oldBoot := Boot
 	Boot = boot
 	defer func() { Boot = oldBoot }()
-	put := func(node, id, tool, state string, started time.Time) {
+	gone := ownerOf("b00t", 4242, boot.Add(-time.Hour))
+	put := func(node, id, tool, state string, started time.Time, owner string) {
 		key, _ := delivery.StepKey(node, id)
-		_, _ = k.put(key, json.RawMessage(mustStep(t, delivery.Step{ID: id, Tool: tool, Node: node, State: state, Started: started})))
+		_, _ = k.put(key, json.RawMessage(mustStep(t, delivery.Step{ID: id, Tool: tool, Node: node, State: state, Started: started, Owner: owner})))
 	}
-	put("ace", "old1", "build_go_fetch", delivery.StepRunning, boot.Add(-time.Hour))
-	put("ace", "mjk3l9x0abcdef", "check ask", delivery.StepRunning, boot.Add(-time.Hour))
-	put("ace", "mjk3l9x0abcdee", "check ask", delivery.StepRunning, time.Now().Add(-5*time.Minute))
-	put("ace", "raced1", "build_go_test", delivery.StepRunning, boot.Add(-time.Hour))
-	put("ace", "new1", "build_go_fetch", delivery.StepRunning, boot.Add(time.Second))
-	put("ace", "done1", "build_go_fetch", delivery.StepPassed, boot.Add(-time.Hour))
-	put("g14", "other1", "build_go_fetch", delivery.StepRunning, boot.Add(-time.Hour))
+	put("ace", "old1", "build_go_fetch", delivery.StepRunning, boot.Add(-time.Hour), "")
+	put("ace", "mjk3l9x0abcdef", "check ask", delivery.StepRunning, boot.Add(-time.Hour), "")
+	put("ace", "mjk3l9x0abcdee", "check ask", delivery.StepRunning, time.Now().Add(-5*time.Minute), "")
+	put("ace", "mjk3l9x0abcded", "check ask", delivery.StepRunning, time.Now().Add(-5*time.Minute), gone) // note 21's ghost
+	put("ace", "gone2", "build_go_test", delivery.StepRunning, boot.Add(time.Second), gone)
+	put("ace", "mine1", "check ask", delivery.StepRunning, boot.Add(-time.Hour), Owner)
+	put("ace", "raced1", "build_go_test", delivery.StepRunning, boot.Add(-time.Hour), "")
+	put("ace", "new1", "build_go_fetch", delivery.StepRunning, boot.Add(time.Second), "")
+	put("ace", "done1", "build_go_fetch", delivery.StepPassed, boot.Add(-time.Hour), gone)
+	put("g14", "other1", "build_go_fetch", delivery.StepRunning, boot.Add(-time.Hour), gone)
 	// raced1 is ended by its own run between the read and the write.
 	raced := false
 	scan := scanOf(k, func(key string) {
 		if key == "ace.raced1" && !raced {
 			raced = true
-			put("ace", "raced1", "build_go_test", delivery.StepPassed, boot.Add(-time.Hour))
+			put("ace", "raced1", "build_go_test", delivery.StepPassed, boot.Add(-time.Hour), "")
 		}
 	})
-	ended, err := EndStale(scan, "ace", boot, nil)
-	if err != nil || len(ended) != 2 || ended[0] == ended[1] {
+	var said []string
+	ended, err := EndStale(scan, "ace", boot, func(f string, a ...any) { said = append(said, fmt.Sprintf(f, a...)) })
+	if err != nil || len(ended) != 4 {
 		t.Fatalf("ended %v, %v", ended, err)
 	}
-	if s := k.last("ace.old1"); s.State != delivery.StepFailed || s.Reason != RestartReason || s.Ended.IsZero() {
-		t.Errorf("old1 = %+v", s)
+	if _, held := k.puts["ace.mjk3l9x0abcded"]; held {
+		t.Errorf("the ghost ask's key is still held: %+v", k.last("ace.mjk3l9x0abcded"))
+	}
+	for _, key := range []string{"ace.old1", "ace.gone2"} {
+		if s := k.last(key); s.State != delivery.StepFailed || s.Reason != RestartReason || s.Ended.IsZero() {
+			t.Errorf("%s = %+v", key, s)
+		}
 	}
 	if s := k.last("ace.mjk3l9x0abcdef"); s.State != delivery.StepFailed || !strings.HasPrefix(s.Reason, "past the step bound: its asker stopped waiting at ") {
 		t.Errorf("the old ask = %+v", s)
 	}
-	for key, state := range map[string]string{"ace.mjk3l9x0abcdee": delivery.StepRunning, "ace.raced1": delivery.StepPassed, "ace.new1": delivery.StepRunning, "ace.done1": delivery.StepPassed, "g14.other1": delivery.StepRunning} {
+	if log := strings.Join(said, "\n"); !strings.Contains(log, "ace.mjk3l9x0abcded") || !strings.Contains(log, "deleted, left to the stream's redelivery") || !strings.Contains(log, "its owner "+gone+" is not this process "+Owner) {
+		t.Errorf("the log does not name the ghost and its owner:\n%s", log)
+	}
+	for key, state := range map[string]string{"ace.mjk3l9x0abcdee": delivery.StepRunning, "ace.mine1": delivery.StepRunning, "ace.raced1": delivery.StepPassed,
+		"ace.new1": delivery.StepRunning, "ace.done1": delivery.StepPassed, "g14.other1": delivery.StepRunning} {
 		if s := k.last(key); s.State != state {
 			t.Errorf("%s = %s, want %s", key, s.State, state)
 		}
 	}
-	// EndOne: refuses without why, a held step, one started by this process (a pulled ask or a step tool's), a step not
-	// running and another node's; ends a step a previous process left.
-	for _, c := range []struct{ id, why string }{{"old1", ""}, {"new1", "stuck"}, {"done1", "x"}, {"g14.other1", "x"}} {
+	// EndOne: refuses without why, a held step, one this process owns or (with no owner) started, a step not running and
+	// another node's; ends a step a previous process left.
+	for _, c := range []struct{ id, why string }{{"old1", ""}, {"new1", "stuck"}, {"mine1", "stuck"}, {"done1", "x"}, {"g14.other1", "x"}} {
 		if _, err := EndOne(scan, "ace", c.id, c.why, nil); err == nil {
 			t.Errorf("ended %s with why %q", c.id, c.why)
 		}
 	}
-	put("ace", "old2", "build_go_fetch", delivery.StepRunning, boot.Add(-time.Hour))
+	put("ace", "old2", "build_go_fetch", delivery.StepRunning, boot.Add(time.Second), gone)
 	if _, err := EndOne(scan, "ace", "old2", "x", func(string) bool { return true }); err == nil {
 		t.Error("ended a held step")
 	}
 	if _, err := EndOne(scan, "ace", "ace.old2", "stuck for good", nil); err != nil {
 		t.Fatal(err)
 	}
-	if s := k.last("ace.old2"); s.State != delivery.StepFailed || s.Reason != "stuck for good" {
+	if s := k.last("ace.old2"); s.State != delivery.StepFailed || s.Reason != "stuck for good" || s.Owner != gone {
 		t.Errorf("old2 = %+v", s)
 	}
+	if a, b := ownerOf("b", 1, boot), ownerOf("b", 1, boot.Add(time.Second)); a == b {
+		t.Errorf("two starts of one pid share the owner %q", a)
+	}
 }
 
 func mustStep(t *testing.T, s delivery.Step) []byte {

go/buildstep/step.go

@@ -1,6 +1,7 @@
 // Package buildstep is what both build modules share: the runner of a long step that answers a tool call at once
 // and ends on its key in the module's `steps` state (novox/hq ADR 0469 §2; issue 1471), the toolchain guard
-// (issue 1473) and the fetch of one commit over SSH (issue 1474).
+// (issue 1473), the fetch of one commit over SSH (issue 1474), and the failure contract of a test level with the parsers
+// of go test -json and node --test's TAP that fill it (failure.go, issue 1901; its conformance kit is package conformance).
 package buildstep
 
 import (
@@ -51,9 +52,9 @@ func Start(ctx context.Context, put Put, node, tool string, run func(ctx context
 	return step.ID, nil
 }
 
-// begin writes the step running under id.
+// begin writes the step running under id, owned by this process (Owner).
 func begin(put Put, node, tool, id, what string) (delivery.Step, string, error) {
-	step := delivery.Step{ID: id, Tool: tool, Node: node, State: delivery.StepRunning, Started: now().UTC(), What: what}
+	step := delivery.Step{ID: id, Tool: tool, Node: node, State: delivery.StepRunning, Started: now().UTC(), What: what, Owner: Owner}
 	key, err := delivery.StepKey(node, step.ID)
 	if err != nil {
 		return delivery.Step{}, "", err

go/buildstep/step_test.go

@@ -70,8 +70,9 @@ func TestStartAnswersAtOnceWithTheStepRunning(t *testing.T) {
 		t.Errorf("Start took %v", d)
 	}
 	s := k.last("ace." + id)
-	if s.State != delivery.StepRunning || s.Tool != "fetch" || s.Node != "ace" || s.ID != id || s.Started.IsZero() {
-		t.Errorf("step = %+v", s)
+	// 1890/AC5: the running key names this process as its owner.
+	if s.State != delivery.StepRunning || s.Tool != "fetch" || s.Node != "ace" || s.ID != id || s.Started.IsZero() || s.Owner != Owner || Owner == "" {
+		t.Errorf("step = %+v, want owner %q", s, Owner)
 	}
 }
 
@@ -100,7 +101,7 @@ func TestStepEndsPassedFailedOrRefusedOnItsKey(t *testing.T) {
 				t.Fatalf("ended key %q", got)
 			}
 			s := k.last("ace." + id)
-			if s.State != c.state || s.Reason != c.reason || string(s.Result) != c.result || s.Ended.IsZero() {
+			if s.State != c.state || s.Reason != c.reason || string(s.Result) != c.result || s.Ended.IsZero() || s.Owner != Owner {
 				t.Errorf("step = %+v", s)
 			}
 		})

go/buildstep/tap.go

@@ -0,0 +1,192 @@
+package buildstep
+
+// The reader of `node --test` under its TAP reporter (issue 1901's thorough fix; first written in mesh-build-node by
+// fix-1901ts): each failing test with its name, its file, its cause and its own block, never a passing line of an
+// earlier file, which is what node's default reporter left the first fifteen lines of.
+
+import (
+	"regexp"
+	"strings"
+)
+
+// NodeTestOptions is the NODE_OPTIONS a build module runs a package's test script with: node's TAP reporter, written to
+// the file dest, so whatever the script prints on its own output the report is whole and machine-readable. A script
+// that names a reporter of its own makes node refuse the run loudly ("--test-reporter must match the number of
+// --test-reporter-destination"), never quietly.
+func NodeTestOptions(dest string) string {
+	return "--test-reporter=tap --test-reporter-destination=" + dest
+}
+
+var ansiEscape = regexp.MustCompile("\x1b\\[[0-9;]*m")
+
+func stripANSI(s string) string { return ansiEscape.ReplaceAllString(s, "") }
+
+// ReadTAP reads the failing tests of a `node --test` run: report is what the TAP reporter wrote (NodeTestOptions'
+// file), console the script's own stdout and stderr, script the name of the script that ran and dir the package's
+// directory, which a test's file is made relative to. A suite that failed only because a test inside it did is not
+// reported twice. A test file that did not load (a syntax error, a crash, an error after its test ended) takes its
+// cause from the lines node wrote before it. When the report holds no failing test (node itself failed, or the script
+// failed before its tests ran: a build, a reporter refused) the failure is the console's (ConsoleFailure).
+func ReadTAP(pkg, script, dir, report, console string) []Failure {
+	var failed []Failure
+	all := strings.Split(stripANSI(strings.ReplaceAll(report, "\r\n", "\n")), "\n")
+	var cancelled []Failure // failed because a suite around them did: said after the failure that carries the cause
+	prev := 0               // the line after the last test block, passing or not: what the run wrote since belongs to the next test
+	for i := 0; i < len(all); i++ {
+		name, ok := tapNotOk(all[i])
+		if !ok {
+			if tapOk(all[i]) {
+				i = tapBlockEnd(all, i) - 1
+				prev = i + 1
+			}
+			continue
+		}
+		indent := len(all[i]) - len(strings.TrimLeft(all[i], " "))
+		block := []string{strings.TrimSpace(all[i])}
+		fields := map[string]string{}
+		var key string
+		inYAML := false
+		j := i + 1
+		for ; j < len(all); j++ {
+			t := strings.TrimSpace(all[j])
+			if !inYAML {
+				if t == "---" {
+					inYAML = true
+					continue
+				}
+				break
+			}
+			if t == "..." {
+				j++
+				break
+			}
+			block = append(block, strings.TrimRight(all[j], " \t"))
+			if k, v, found := tapKey(all[j], indent); found {
+				key = k
+				if v != "|-" && v != "|" {
+					fields[k] = strings.Trim(v, "'")
+				}
+			} else if key != "" && fields[key] == "" && t != "" {
+				fields[key] = t // the first line of a block scalar
+			}
+		}
+		from, at := prev, i
+		i, prev = j-1, j
+		if fields["failureType"] == "subtestsFailed" {
+			continue
+		}
+		cause := fields["error"]
+		if cause == "test failed" || cause == "" {
+			// a file that did not load, or an error after a test ended: node says only "test failed" and wrote the
+			// error as comment lines before it
+			var own []string
+			for _, l := range all[from:at] {
+				if t := strings.TrimSpace(l); strings.HasPrefix(t, "# ") && !strings.HasPrefix(t, "# Subtest") {
+					own = append(own, strings.TrimPrefix(t, "# "))
+				}
+			}
+			for _, l := range own {
+				if strings.Contains(l, "Error") {
+					cause = l
+					break
+				}
+			}
+			if cause == "" && len(own) > 0 {
+				cause = own[0]
+			}
+			block = append(own, block...)
+		}
+		if cause == "" {
+			cause = fields["failureType"]
+		}
+		if cause == "" {
+			cause = "the test failed and node said no error"
+		}
+		cause = CutLine(cause)
+		file := strings.TrimPrefix(fields["location"], "file://")
+		if dir != "" {
+			file = strings.TrimPrefix(file, strings.TrimSuffix(dir, "/")+"/")
+		}
+		f := Failure{Package: pkg, Test: name, File: file, Cause: cause, Output: Clip(block, cause)}
+		if fields["failureType"] == "cancelledByParent" {
+			cancelled = append(cancelled, f)
+			continue
+		}
+		failed = append(failed, f)
+	}
+	if failed = append(failed, cancelled...); len(failed) > 0 {
+		return failed
+	}
+	var comments []string
+	for _, l := range all {
+		if t := strings.TrimSpace(l); strings.HasPrefix(t, "# ") && !strings.HasPrefix(t, "# Subtest") && !tapCount(t) {
+			comments = append(comments, strings.TrimPrefix(t, "# "))
+		}
+	}
+	return []Failure{ConsoleFailure(pkg, script, strings.Join(comments, "\n")+"\n"+console)}
+}
+
+// tapCount says a comment is TAP's closing count ("# tests 3", "# pass 2", "# duration_ms 1.2").
+func tapCount(t string) bool {
+	for _, w := range []string{"tests", "suites", "pass", "fail", "cancelled", "skipped", "todo", "duration_ms"} {
+		if strings.HasPrefix(t, "# "+w+" ") {
+			return true
+		}
+	}
+	return false
+}
+
+// tapOk says a line is a passing test's "ok N - name", indented or not.
+func tapOk(l string) bool {
+	rest, ok := strings.CutPrefix(strings.TrimSpace(l), "ok ")
+	return ok && rest != "" && rest[0] >= '0' && rest[0] <= '9'
+}
+
+// tapBlockEnd is the line after the test line at i and its YAML block ("---" to "...").
+func tapBlockEnd(all []string, i int) int {
+	j := i + 1
+	if j >= len(all) || strings.TrimSpace(all[j]) != "---" {
+		return j
+	}
+	for j++; j < len(all); j++ {
+		if strings.TrimSpace(all[j]) == "..." {
+			return j + 1
+		}
+	}
+	return j
+}
+
+// tapNotOk is the test name of a "not ok N - name" line, indented or not; a TODO or SKIP directive fails nothing.
+func tapNotOk(l string) (string, bool) {
+	t := strings.TrimSpace(l)
+	rest, ok := strings.CutPrefix(t, "not ok ")
+	if !ok {
+		return "", false
+	}
+	if u := strings.ToUpper(rest); strings.Contains(u, " # TODO") || strings.Contains(u, " # SKIP") {
+		return "", false
+	}
+	if _, after, found := strings.Cut(rest, " - "); found {
+		rest = after
+	}
+	return strings.TrimSpace(rest), true
+}
+
+// tapKey is "key: value" of a field of a TAP block, whose lines sit two spaces deeper than their "not ok" line; a deeper
+// line is part of a block scalar (an error's lines, a stack).
+func tapKey(l string, indent int) (key, val string, ok bool) {
+	t := strings.TrimLeft(l, " ")
+	if len(l)-len(t) != indent+2 {
+		return "", "", false
+	}
+	k, v, found := strings.Cut(t, ": ")
+	if !found {
+		if k, found = strings.CutSuffix(t, ":"); !found {
+			return "", "", false
+		}
+	}
+	if k == "" || strings.ContainsAny(k, " ()/") {
+		return "", "", false
+	}
+	return k, strings.TrimSpace(v), true
+}

go/buscompose/buscompose_test.go

@@ -9,6 +9,8 @@ import (
 	"slices"
 	"strings"
 	"testing"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
 // Defends issue 1377 and novox/hq ADR 0547 §5: this is the controller's bus composer copied, and it composes byte for
@@ -33,7 +35,7 @@ func beyondTheControllers(user string) map[string]bool {
 	if !ok {
 		return out
 	}
-	for _, s := range append(readGrants("node-engine_have", "*.node"), NodeComposeReads(node)...) {
+	for _, s := range append(append(readGrants("node-engine_have", "*.node"), NodeComposeReads(node)...), NodeComposeAdvisories()...) {
 		out[s] = true
 	}
 	return out
@@ -118,6 +120,20 @@ func grantsAsTheControllers(t *testing.T, got, want string) {
 }
 
 func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
+	// ADR 0567 §3, §9: a node reads every key of the seat's placement and its candidates (it composes with the whole
+	// proposal laid over), and none of its open proposals; it writes neither.
+	reads := strings.Join(NodeComposeReads("laptop"), " ")
+	for bucket, granted := range map[string]bool{delivery.PlacementBucket: true, delivery.PlacementCandidatesBucket: true,
+		delivery.PlacementProposalsBucket: false} {
+		if strings.Contains(reads, "$JS.API.DIRECT.GET.KV_"+bucket+".>") != granted || strings.Contains(reads, "$KV."+bucket+".laptop") {
+			t.Errorf("a node is granted %s: %v, want %v", bucket, !granted, granted)
+		}
+	}
+	// It hears the creation of those two buckets, and of no other.
+	if got := NodeComposeAdvisories(); len(got) != 2 || got[0] != "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_mesh-delivery-assigner_placement" ||
+		got[1] != "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_mesh-delivery-assigner_candidates" {
+		t.Errorf("a node hears the creation of %v", got)
+	}
 	raw, err := os.ReadFile(filepath.Join("testdata", "controller-user-lists.json"))
 	if err != nil {
 		t.Fatal(err)
@@ -223,6 +239,31 @@ func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
 		if !slices.Contains(perms.Subscribe, VaultSecretChanged) {
 			t.Errorf("node one does not hear the vault's secret-changed: %v", perms.Subscribe)
 		}
+		// And what a module on another node serves from its settings, that key alone (mailu's smtp domain, issue 1126).
+		users, err := Users(Records{Nodes: []string{"one", "two"}, Assigned: map[string][]Declared{
+			"two": {{Module: "mailer", Served: []string{"domain", "not.a.token"}}}}})
+		if err != nil {
+			t.Fatal(err)
+		}
+		get := func(key string) string {
+			return "$JS.API.DIRECT.GET.KV_" + ResolvedBucket + ".$KV." + ResolvedBucket + "." + key
+		}
+		for _, u := range users {
+			if u.Kind != KindNode {
+				continue
+			}
+			perms, err := PermissionsFor(u)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if u.Node == "one" && (!reflect.DeepEqual(u.ServedReads, []string{"two.mailer.domain"}) || !MayPublish(perms, get("two.mailer.domain")) ||
+				MayPublish(perms, get("two.mailer.sitename"))) {
+				t.Errorf("node one reads %v of two's resolved values", u.ServedReads)
+			}
+			if u.Node == "two" && len(u.ServedReads) != 0 {
+				t.Errorf("node two is granted its own served keys apart: %v", u.ServedReads)
+			}
+		}
 	})
 	t.Run("the controller's golden server configuration", func(t *testing.T) {
 		seat := Seat{Name: "telegram-sender", Accepts: []string{"send"}, Emits: []string{"delivered", "failed"}}

go/buscompose/nats.go

@@ -217,6 +217,10 @@ type Principal struct {
 	// ADR 0547 §2, ADR 0550 §5, issue 1126): its modules' own secrets sealed to its key, for the compositions it makes
 	// itself. Set while the vault's holder serves it.
 	AsksItsOwnSecrets bool
+	// ServedReads are, for a machine principal, the keys of mesh-config's resolved values that other nodes' modules serve
+	// from (`<node>.<module>.<key>`, catalogue.ServedSettings): what every consumer is told, and so what a node composing
+	// its own modules reads of a provider elsewhere (issue 1126), each key alone. Sorted, none twice.
+	ServedReads []string
 	// FollowsGrantsUserList is the machine principal of the node holding mesh-broker: its node-engine reads the grants
 	// part's sealed user list, one key and an object by name (novox/hq ADR 0547 clause 7, GrantsUserListFollows).
 	FollowsGrantsUserList bool
@@ -894,10 +898,16 @@ func PermissionsFor(p Principal) (Permissions, error) {
 		// its own modules reads the other nodes' public records, which its firewall and resolver need (ADR 0547 §2). Read
 		// only: each node still writes its own keys alone.
 		pub = append(pub, readGrants(delivery.HaveBucket, "*."+delivery.HaveNodeWord)...)
-		// And what it composes its own modules from (ADR 0547 §2, ADR 0549 §3): the indexer's placement, modules and
-		// manifests, the builder's builds (the manifest of a build its want names), and mesh-config's resolved values of
+		// And what it composes its own modules from (ADR 0547 §2, ADR 0567 §9): the seat mesh-placement's placement and
+		// candidates, the indexer's modules and manifests, the builder's builds (the manifest of a build its want names), and mesh-config's resolved values of
 		// its own node alone. Read only.
 		pub = append(pub, NodeComposeReads(p.Node)...)
+		// And, of the other nodes' resolved values, the keys their modules serve from (issue 1126), each one key.
+		served, err := ServedReadGrants(p.ServedReads)
+		if err != nil {
+			return Permissions{}, err
+		}
+		pub = append(pub, served...)
 		// And an object of the declaration bucket by its name, and nothing of the bucket's list or writing
 		// (novox/hq ADR 0486 §2, issue 1697).
 		fileReads, err := DeclarationFilesReads(p.Node)
@@ -921,6 +931,9 @@ func PermissionsFor(p Principal) (Permissions, error) {
 		// And the backup holder's word that it backed the module up (ADR 0539 clause 16), whichever module holds
 		// node-backup: one event, by its name.
 		sub = append(sub, NodeAgentHears...)
+		// And the creation of the seat mesh-placement's two states it composes from (ADR 0567 §9), so a node agent started
+		// before they exist binds each when the bus says it was made, with no timer; no other bucket's.
+		sub = append(sub, NodeComposeAdvisories()...)
 		// And, while the vault serves it, the vault's move-in in its own name and nobody else's (issue 676): the
 		// values sealed to this machine, which only it opens, handed in sealed to the vault's key for the call.
 		if p.MovesIntoTheVault {

go/buscompose/state.go

@@ -311,14 +311,49 @@ func RaiseBuckets(a BucketAsserter, buckets []Bucket) (undeclared []string, err
 // ResolvedBucket is mesh-config's state of resolved values, keyed `<node>.<module>.<key>`.
 const ResolvedBucket = "mesh-config_resolved"
 
-// NodeComposeReads is what a node's agent reads to compose its own modules (novox/hq ADR 0547 §2, ADR 0549 §3, issue
-// 1126): every key of the indexer's placement, modules and manifests and of the builder's builds, and of mesh-config's
-// resolved values only its own node's, `<node>.>`. Reads only; the node is checked as every subject token is by the
-// caller's principal.
+// NodeComposeReads is what a node's agent reads to compose its own modules (novox/hq ADR 0547 §2, ADR 0567 §3, §9,
+// issue 1126): every key of the seat mesh-placement's placement and candidates (both the assigner's states), of the
+// indexer's modules and manifests and of the builder's builds, and of mesh-config's resolved values only its own node's,
+// `<node>.>`. Every candidate key, not only `*.<node>`: a node answering its candidate composes with the whole
+// proposal laid over (the seed places every node at once, and a binding crosses nodes), and nothing in a placement is
+// secret. Reads only; the node is checked as every subject token is by the caller's principal.
 func NodeComposeReads(node string) []string {
 	var out []string
-	for _, bucket := range []string{delivery.PlacementBucket, delivery.ModulesBucket, delivery.ManifestsBucket, delivery.BuilderBuildsBucket} {
+	for _, bucket := range []string{delivery.PlacementBucket, delivery.PlacementCandidatesBucket, delivery.ModulesBucket,
+		delivery.ManifestsBucket, delivery.BuilderBuildsBucket} {
 		out = append(out, readGrants(bucket, "")...)
 	}
 	return append(out, readGrants(ResolvedBucket, node+".>")...)
 }
+
+// NodeComposeAdvisories are the stream-created advisories of the seat mesh-placement's placement and candidates
+// (ADR 0567 §9): what a node agent hears to bind each once it is made. Those two and no wider.
+func NodeComposeAdvisories() []string {
+	return []string{StreamCreatedAdvisory(delivery.PlacementBucket), StreamCreatedAdvisory(delivery.PlacementCandidatesBucket)}
+}
+
+// ServedReadGrants is the read of each key of mesh-config's resolved values named, `<node>.<module>.<key>`
+// (Principal.ServedReads, issue 1126): a get and a watch of that key alone. Each part is checked as every subject token
+// is, so a key cannot widen the grant.
+func ServedReadGrants(keys []string) ([]string, error) {
+	var out []string
+	seen := map[string]bool{}
+	for _, k := range keys {
+		parts := strings.Split(k, ".")
+		if len(parts) != 3 {
+			return nil, fmt.Errorf("%q is not <node>.<module>.<key>", k)
+		}
+		for _, part := range parts {
+			if !safeSubject.MatchString(part) {
+				return nil, fmt.Errorf("%q cannot be part of a subject: a permission is a subject pattern, and this would widen it", part)
+			}
+		}
+		for _, g := range readGrants(ResolvedBucket, k) {
+			if !seen[g] {
+				seen[g] = true
+				out = append(out, g)
+			}
+		}
+	}
+	return out, nil
+}

go/buscompose/users.go

@@ -5,6 +5,7 @@ import (
 	"git.novox.be/novox/mesh-sdk/go/announce"
 	"slices"
 	"sort"
+	"strings"
 )
 
 // Every user the composed file should contain, derived from what the mesh knows.
@@ -25,6 +26,9 @@ type Declared struct {
 	Emits    []string
 	Consumes []string
 	Serves   []string
+	// Served are the config keys its served values and zone name fill from its settings (catalogue.ServedSettings): what
+	// every node may read of its resolved values where it runs (Principal.ServedReads, issue 1126).
+	Served []string
 	// Holds are the seats this module claims, with the protocol each seat declares. A seat the
 	// mesh defines for itself declares no protocol, so holding one grants nothing on the bus —
 	// which is right: those seats are about who does a job, not about who may say what.
@@ -144,6 +148,7 @@ func Users(r Records) ([]Principal, error) {
 	out := []Principal{{Kind: KindController, Uses: asksSeatOf(r), AsksIssued: issuedOf(r), AsksTheVault: vaultVerbsOf(r),
 		AsksTheConfig: servedOf(r, VerbsTheControllerAsksTheConfig), FilesFor: sortedCopy(r.Nodes)}}
 
+	served := servedReadsOf(r)
 	for _, node := range sortedCopy(r.Nodes) {
 		witness := false
 		var checks []string
@@ -160,7 +165,7 @@ func Users(r Records) ([]Principal, error) {
 		out = append(out, Principal{Kind: KindNode, Node: node, WitnessesController: witness, Checks: checks,
 			MovesIntoTheVault: servesMoveIn(r), StatesItsKeyToTheVault: servesVerb(r, VaultNodeKey),
 			AsksItsOwnSecrets:     servesVerb(r, VaultOwn),
-			FollowsGrantsUserList: bus})
+			FollowsGrantsUserList: bus, ServedReads: servedOn(served, node)})
 		// **And the machine's provisioner client, on an account of its own** (novox/hq ADR 0349 clause 11): one
 		// per machine that runs it, delivered to the module running it.
 		for _, d := range r.Assigned[node] {
@@ -459,3 +464,32 @@ func declaredStreamsOf(r Records) []string {
 	sort.Strings(out)
 	return out
 }
+
+// servedReadsOf is every key of mesh-config's resolved values a module assigned on a node serves from,
+// `<node>.<module>.<key>`, sorted: each part a subject token, so a key that cannot be one is granted nothing (and the
+// node composing a consumer of it refuses, naming it), never a wider read.
+func servedReadsOf(r Records) []string {
+	var out []string
+	for node, declared := range r.Assigned {
+		for _, d := range declared {
+			for _, k := range d.Served {
+				if safeSubject.MatchString(node) && safeSubject.MatchString(d.Module) && safeSubject.MatchString(k) {
+					out = append(out, node+"."+d.Module+"."+k)
+				}
+			}
+		}
+	}
+	sort.Strings(out)
+	return slices.Compact(out)
+}
+
+// servedOn is, of the served keys, those of other nodes than node: its own slice it reads whole.
+func servedOn(served []string, node string) []string {
+	var out []string
+	for _, k := range served {
+		if !strings.HasPrefix(k, node+".") {
+			out = append(out, k)
+		}
+	}
+	return out
+}

go/catalogue/config_test.go

@@ -445,6 +445,19 @@ func TestAnUnsetRequiredValueIsRefusedInTheConfigFormsWords(t *testing.T) {
 		t.Fatalf("not typed as a value nobody gave: %v", err)
 	}
 
+	// A contribution's value too (issue 1126, seed-8: de-spiegel's route names were refused with ${setting:…}).
+	withRoute := inConfigForm()
+	withRoute["contributes"] = map[string]any{"route": map[string]any{"site": map[string]any{"name": "${config:sender}", "port": 80}}}
+	routed, err := parseRaw(t, withRoute)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = Resolution{}.composed(routed, "route", routed.ContributesMany["route"]["site"], nil, "notifier contributing site to route")
+	if !errors.As(err, &unset) || unset.Module != "notifier" || !strings.Contains(err.Error(),
+		`notifier has a contribution site to route, in "name", that says ${config:sender}`) || strings.Contains(err.Error(), "${setting:") {
+		t.Fatalf("a contribution's unset value is not said in the config form's words: %v", err)
+	}
+
 	settingsForm := notifier()
 	settingsForm.Resources[0]["content"] = "from = ${setting:domain}\n"
 	err = unsetInConfigWords(settingInto(settingsForm.Resources[0], nil, "notifier"), settingsForm)

go/catalogue/declaration.go

@@ -10,6 +10,7 @@ package catalogue
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"sort"
 	"strconv"
@@ -138,6 +139,9 @@ type Rendering struct {
 	// Kept is every operator-sealed secret in the mesh, for a module that `keeps` them. Nil when
 	// nothing on this node keeps them, or the mesh has no operator key.
 	Kept *KeptExport
+	// KeptRuns is, by module, the file of the export as the node runs it, for a composer that holds no export (a node
+	// composing its own: the export is the controller's store's, issue 1126, C6): carried as it runs when Kept is nil.
+	KeptRuns map[string]map[string]any
 
 	// OutwardLinks is the links this machine reported as facing outside it, which the filter is
 	// written around (novox/hq ADR 0140). Empty means the machine has not said, and the mesh
@@ -929,6 +933,14 @@ func (r Resolution) compose(with Rendering, owner map[string]string,
 			}
 			// Read by the module as its secrets' owner when it names one: the vault, as its own account (issue 723).
 			first = append(first, ownedBy(m.SecretsOwner, file))
+		} else if runs, ok := with.KeptRuns[m.Module]; m.Keeps != "" && ok {
+			file := make(map[string]any, len(runs))
+			for k, v := range runs {
+				file[k] = v
+			}
+			file["id"] = KeptID()
+			delete(file, "module")
+			first = append(first, file)
 		}
 		if m.Computed != "" {
 			mine, part := generated[m.Module]
@@ -1821,7 +1833,14 @@ func (r Resolution) composed(m Manifest, to string, raw map[string]any, layers [
 	// module's files is no part of it (novox/hq 04-ISSUES/173).
 	values, err := overridden(raw, WithDefaults(m, layers), what)
 	if err != nil {
-		return nil, fmt.Errorf("%s: %w", what, err)
+		// A required value nothing sets is said in the words of the module's form, as a file's, a unit's and an owner's
+		// are (issue 1126, seed-8: de-spiegel in the config form was refused with ${setting:…} and `settings set`).
+		var unset *UnsetSettingError
+		if errors.As(err, &unset) && unset.Module == "" {
+			unset.Module = m.Module
+			unset.where = fmt.Sprintf("a contribution%s, in %q,", strings.TrimPrefix(what, m.Module+" contributing"), unset.field)
+		}
+		return nil, unsetInConfigWords(fmt.Errorf("%s: %w", what, err), m)
 	}
 	reaches, err := Reaches(m, layers)
 	if err != nil {

go/catalogue/files.go

@@ -121,7 +121,7 @@ func (r Resolution) ownedPaths() map[string]string {
 	for _, s := range Seats() {
 		for _, sp := range s.Paths {
 			for _, m := range r.Modules {
-				if m.ClaimsSeat(s.Name) && declaresPath(m, path.Clean(sp.Path)) {
+				if m.ClaimsSeat(s.Name) && declaresPath(m, path.Clean(sp.Path)) && !r.stepsBackHere(m, sp) {
 					owned[sp.Path] = m.Module + " (" + s.Name + ")"
 				}
 			}
@@ -130,6 +130,22 @@ func (r Resolution) ownedPaths() map[string]string {
 	return owned
 }
 
+// stepsBackHere says m's seat path steps back on this machine (novox/hq ADR 0287): it names a seat whose holder here
+// declares the path too, so that holder owns it, as stepsBack leaves m's own rendering of it out. Without it the owner
+// told was the last seat in the order of the seat table, which the controller reads sorted by name and a node in the
+// order compiled (issue 1126, C3: /etc/resolv.conf, node-uplink against node-resolver).
+func (r Resolution) stepsBackHere(m Manifest, sp SeatPath) bool {
+	if sp.StepsBackFor == "" {
+		return false
+	}
+	for _, o := range r.Modules {
+		if o.Module != m.Module && holdsSeat(o, sp.StepsBackFor) && declaresPath(o, path.Clean(sp.Path)) {
+			return true
+		}
+	}
+	return false
+}
+
 // filesWords is what the holder of node-files is given beside its own words: the node's secret places and the
 // paths modules own here.
 func (r Resolution) filesWords(m Manifest, words map[string]string, with Rendering) (map[string]string, error) {

go/catalogue/files_test.go

@@ -2,6 +2,7 @@ package catalogue
 
 import (
 	"encoding/json"
+	"slices"
 	"sort"
 	"strings"
 	"testing"
@@ -86,6 +87,39 @@ func TestTheHolderOfNodeFilesIsToldSecretPlacesAndOwnedPaths(t *testing.T) {
 	if !strings.HasPrefix(owned["/etc/app/app.conf"], "app") {
 		t.Errorf("a placed file is owned by %q, want app", owned["/etc/app/app.conf"])
 	}
+	// Issue 1126, C3: a seat path that steps back for a seat held here is that holder's, whatever the order of the seat
+	// table (the controller reads it sorted by name, a node in the order compiled).
+	resolver := Manifest{Module: "systemd-resolved", Version: "1", Claims: []Claim{{Name: ResolverSeat}},
+		Resources: []map[string]any{{"id": "stub", "type": "file", "path": ResolverFile}}}
+	uplink := Manifest{Module: "networkmanager", Version: "1", Claims: []Claim{{Name: "node-uplink"}},
+		Resources: []map[string]any{{"id": "resolv", "type": "file", "path": ResolverFile}}}
+	compiled := seats
+	t.Cleanup(func() { seats = compiled })
+	for _, order := range []string{"compiled", "reversed"} {
+		if order == "reversed" {
+			seats = append([]Seat(nil), compiled...)
+			slices.Reverse(seats)
+		}
+		both := Resolution{Node: "anchor", Modules: []Manifest{files, uplink, resolver}}
+		w, err := both.filesWords(files, nil, Rendering{})
+		if err != nil {
+			t.Fatal(err)
+		}
+		var o map[string]string
+		if err := json.Unmarshal([]byte(w[FilesOwnedPaths]), &o); err != nil || o[ResolverFile] != "systemd-resolved ("+ResolverSeat+")" {
+			t.Errorf("seat table %s: %s is owned by %q, want systemd-resolved (%s)", order, ResolverFile, o[ResolverFile], ResolverSeat)
+		}
+	}
+	seats = compiled
+	// Issue 1126, C5 and seed-8: a module carried as it runs (compose.Carried) owns its manifest's paths (OwnsPaths), as
+	// the controller tells them, and not the paths its running resources are at (a directory the mesh placed).
+	carried := Manifest{Module: "de-spiegel", Version: "1", OwnsPaths: []string{"/var/lib/de-spiegel/server.env"},
+		Resources: []map[string]any{{"id": "state", "type": "directory", "path": "/var/lib/de-spiegel"}}}
+	w, err := Resolution{Node: "anchor", Modules: []Manifest{files, carried}}.filesWords(files, nil, Rendering{})
+	if err != nil || !strings.Contains(w[FilesOwnedPaths], `"/var/lib/de-spiegel/server.env":"de-spiegel (its own tools)"`) ||
+		strings.Contains(w[FilesOwnedPaths], `"/var/lib/de-spiegel":`) {
+		t.Errorf("a carried module does not own its manifest's paths alone: %v %v", w[FilesOwnedPaths], err)
+	}
 	if w, _ := r.filesWords(app, nil, Rendering{}); w[FilesOwnedPaths] != "" {
 		t.Error("a module not holding node-files is told the owned paths")
 	}

go/catalogue/laid_values.go

@@ -0,0 +1,44 @@
+package catalogue
+
+import "encoding/json"
+
+// The sources mesh-config says a resolved value came from, in mesh-config_resolved (novox/hq ADR 0348 §9): a key of
+// it holds {"value": …, "source": …}.
+const (
+	SourceMesh    = "mesh"
+	SourceNode    = "node"
+	SourceModule  = "module"
+	SourceDefault = "default"
+	SourceUnset   = "unset"
+)
+
+// LaidSource says whether a value resolved from source is laid over a module's files: mesh config, node config and the
+// module's own value are; a manifest's default is not, since it is the composition's already and a taken key is laid
+// only when a layer sets it, never from a default (TakesSettingsField); an unset value is not, since a required one is
+// refused by the composition by name. **The one rule for every composer** (issue 1126, C2): the controller's config
+// read and a node composing its own lay the same values, so the two compose the same files.
+func LaidSource(source string) bool {
+	switch source {
+	case SourceMesh, SourceNode, SourceModule:
+		return true
+	}
+	return false
+}
+
+// LaidValue is one key of mesh-config_resolved read as a composer lays it: its value, and true when its source is laid
+// (LaidSource) and it holds a value; false for a default, an unset value, a source not known and a value that cannot be
+// read.
+func LaidValue(raw []byte) (any, bool) {
+	var r struct {
+		Value  json.RawMessage `json:"value"`
+		Source string          `json:"source"`
+	}
+	if json.Unmarshal(raw, &r) != nil || !LaidSource(r.Source) || len(r.Value) == 0 {
+		return nil, false
+	}
+	var v any
+	if json.Unmarshal(r.Value, &v) != nil {
+		return nil, false
+	}
+	return v, true
+}

go/catalogue/launchers.go

@@ -0,0 +1,25 @@
+package catalogue
+
+import "strings"
+
+// LauncherSuffix is what a TypeScript entrypoint's launcher is called beside it: index.js is started as
+// index.serve.mjs (novox/hq ADR 0193), an ES module by its own extension whatever the bundle's package.json says.
+const LauncherSuffix = ".serve.mjs"
+
+// Launchers are the launchers a bundle's build writes, by entrypoint, relative to the bundle's root: for TypeScript
+// every entrypoint `x.js` is started by `x.serve.mjs` beside it; an entrypoint that is not JavaScript and every other
+// language, whose build is already executable, get none. The one rule mesh-build-node, build-agent, the controller and
+// a node taking in a build share (R4e, issue 1126; buildstep.Launchers says it for the build modules), so the name a
+// build writes is the name a reader expects.
+func Launchers(language string, entrypoints []string) map[string]string {
+	out := map[string]string{}
+	if language != "typescript" {
+		return out
+	}
+	for _, entry := range entrypoints {
+		if strings.HasSuffix(entry, ".js") {
+			out[entry] = strings.TrimSuffix(entry, ".js") + LauncherSuffix
+		}
+	}
+	return out
+}

go/catalogue/manifest.go

@@ -864,6 +864,12 @@ type Manifest struct {
 	// that could only see its own ports would write a rule set that closed everything else.
 	Filtering *Filtering `json:"filtering,omitempty"`
 
+	// OwnsPaths is, for a module composed from what runs of it (compose.Carried: folded into its node's own composition
+	// at a build of the old form, issue 1126, C5), the paths it owns: its manifest's (DeclaredPaths), as the controller
+	// tells the holder of node-files them, in place of its resources', which are what runs (a directory placed at a
+	// path its manifest leaves to the mesh, a binding). Nil for any other module. Never in a manifest's JSON.
+	OwnsPaths []string `json:"-"`
+
 	// Jails are the fail2ban jails this module declares for its own service (novox/hq to-be 31).
 	// Written into whichever node runs the module, the same way `listens` become that node's rules.
 	Jails []Jail `json:"jails,omitempty"`

go/catalogue/placement_seat.go

@@ -0,0 +1,74 @@
+package catalogue
+
+// The seat of placement (novox/hq ADR 0567): which module runs on which node, with its host ports, bindings, the
+// node's pins and holdings, the config placement and values, and what a person decides of the node, is state on the
+// bus held by this seat, changed only by a proposal the nodes it touches answer and the operator approves. Held once
+// for the mesh by the assigner (mesh-delivery-assigner), beside its wants. Its states are named after the holding
+// module, as every module state is (delivery.PlacementBucket, PlacementProposalsBucket, PlacementCandidatesBucket);
+// they are the seat's contract, so every reader takes their names from mesh-sdk, and a change of holder is a migration
+// the new holder's record decides (ADR 0567 §1). Its events are the holder's too, carried on the holder's stream
+// (delivery.PlacementStream): the names are in delivery (PlacementProposedEvent and the rest).
+
+// PlacementSeat is the seat the assigner holds for placement.
+const PlacementSeat = "mesh-placement"
+
+// The seat's seven verbs (ADR 0567 §10).
+const (
+	PlacementVerbPlacement = "placement"
+	PlacementVerbProposals = "proposals"
+	PlacementVerbPropose   = "propose"
+	PlacementVerbWithdraw  = "withdraw"
+	PlacementVerbAgain     = "again"
+	PlacementVerbAdopt     = "adopt"
+	PlacementVerbHandBack  = "hand-back"
+)
+
+// placementVerbs are the seat's verbs: what reads all it keeps and does by hand all it does by itself (ADR 0567 §10).
+// Optional while the holder that serves them is not yet on every node (design 33 §7): the seat is new in the same
+// delivery as its holder.
+func placementVerbs() []Verb {
+	changes := map[string]any{"type": "array", "minItems": 1, "description": "the changes, each an object with `op`: " +
+		"place (node, module, ports, bindings), take-off (node, module), pin (node, provision, provider {node, module}), " +
+		"unpin (node, provision), hold (node, module, claim, scope, kind, site), unhold (node, module, claim), decide " +
+		"(node, field, value: a decided field of the node, its address among them), config (node, module, mesh-wide, " +
+		"layer, mesh-wide-values, values)",
+		"items": map[string]any{"type": "object", "required": []string{"op", "node"}}}
+	return []Verb{
+		{Name: PlacementVerbPlacement, Optional: true, Description: "Read placement: one node's key, the nodes one " +
+			"module is placed on, or every key, each with its revision, and how full the state is against its cap. With " +
+			"history, one node's or one module's changes in order: a revision the state keeps whole, an older one as the " +
+			"proposal's changes from its placement-changed event.",
+			Input: schema(map[string]string{"node": "one node", "module": "one module: the nodes it is placed on",
+				"history": "\"true\": the changes in order, from the stream and the state's revisions"}, nil, "history")},
+		{Name: PlacementVerbProposals, Optional: true, Description: "Every open proposal of placement: its changes, " +
+			"the revision of each key it was laid over, its candidates, every node's answer, the differences computed and " +
+			"answered, its verdict and its ask. Narrowed to one by id.",
+			Input: schema(map[string]string{"id": "one proposal's id"}, nil)},
+		{Name: PlacementVerbPropose, Optional: true, Description: "Propose a change of placement, with why: laid over " +
+			"the current keys and refused at once, naming every finding, when the result cannot be placed (two modules " +
+			"on one host port, a provider not placed, a seat held once held twice, two nodes with one address, two " +
+			"hubs, a module the indexer does not hold, a node with no record). Otherwise the nodes it touches compose " +
+			"it in shadow and answer, and on a passing verdict the operator is asked to approve it. Who proposes is the " +
+			"caller, as the runtime proves it.",
+			Input: map[string]any{"type": "object", "additionalProperties": false, "required": []string{"why", "changes"},
+				"properties": map[string]any{
+					"why":     map[string]any{"type": "string", "description": "why, shown to the operator with the proposal"},
+					"changes": changes,
+				}}},
+		{Name: PlacementVerbWithdraw, Optional: true, Description: "Withdraw an open proposal: its key and its " +
+			"candidates are deleted and placement-withdrawn carries it whole. With why.",
+			Input: schema(map[string]string{"id": "the proposal's id", "why": "why, kept in the event"}, []string{"id", "why"})},
+		{Name: PlacementVerbAgain, Optional: true, Description: "Judge an open proposal now with the answers that " +
+			"stand, and raise its ask again when its verdict passes and the operator's channel does not hold the ask. " +
+			"Nothing more: the recovery of a proposal whose judgement or ask was lost.",
+			Input: schema(map[string]string{"id": "the proposal's id"}, []string{"id"})},
+		{Name: PlacementVerbAdopt, Optional: true, Description: "Take placement over from the controller: its " +
+			"placement-export is proposed whole as the seed, every node's key, which every node must answer as the same. " +
+			"Its Approve is the take-over; at the warrant the export is read again and a changed one is proposed anew.",
+			Input: schema(map[string]string{"why": "why, shown to the operator"}, []string{"why"})},
+		{Name: PlacementVerbHandBack, Optional: true, Description: "The operator's alone, recorded as a hand act: " +
+			"delete every placement key, the history kept, so every node returns to the controller's compositions. " +
+			"Refused after the lease write.",
+			Input: schema(map[string]string{"why": "why, recorded with the hand act"}, []string{"why"})},
+	}
+}

go/catalogue/seat_paths.go

@@ -123,6 +123,14 @@ func namesWithoutSteppingBack(s Seat, p string) bool {
 // as written would pass for a path nobody named.
 func declaredPaths(m Manifest) map[string]bool {
 	out := map[string]bool{}
+	if m.OwnsPaths != nil {
+		// Carried: what its manifest declares, never what runs of it (issue 1126, seed-8: f1-circuits, snake and txt-game
+		// on ace owned their /var/lib paths on the node and none on the controller).
+		for _, p := range m.OwnsPaths {
+			out[p] = true
+		}
+		return out
+	}
 	for _, r := range m.Resources {
 		if p, ok := r["path"].(string); ok && strings.HasPrefix(p, "/") {
 			out[path.Clean(p)] = true
@@ -136,6 +144,12 @@ func declaredPaths(m Manifest) map[string]bool {
 	return out
 }
 
+// DeclaredPaths is every machine path a module's manifest declares it owns (declaredPaths), sorted and never nil: what
+// a carried module owns (Manifest.OwnsPaths).
+func DeclaredPaths(m Manifest) []string {
+	return append([]string{}, sortedKeys(declaredPaths(m))...)
+}
+
 // declaresPath says whether a module declares one path, as a resource or as a file the mesh renders.
 func declaresPath(m Manifest, p string) bool { return declaredPaths(m)[p] }
 

go/catalogue/seats.go

@@ -209,6 +209,16 @@ var defaultSeats = append([]Seat{
 				"first or changed key is recorded and the machine's core secrets are said changed; the same key " +
 				"again changes nothing.",
 				Input: schema(map[string]string{"key": "the machine's sealing key, a raw X25519 public key in base64"}, nil)},
+			// A machine's node-engine composes its own modules and asks their secrets sealed to its key (novox/hq ADR 0547
+			// §2, ADR 0550 §5, issue 1126); granted as buscompose's Principal.AsksItsOwnSecrets says.
+			{Name: "own", Optional: true, Description: "Answer the node-engine of one machine, about its own machine " +
+				"alone (as the bus proved the caller, never an argument), its modules' own secrets and the pair " +
+				"credentials it consumes or provides that it names, each sealed to the key it stated with node-key. A " +
+				"credential the vault does not hold is named missing; never a value in the clear.",
+				Input: map[string]any{"type": "object", "properties": map[string]any{"credentials": map[string]any{
+					"type": "array", "items": map[string]any{"type": "object"},
+					"description": "the pair credentials the machine's composition reads, each {role: consumer|provider, " +
+						"provision, consumer, consumer_module, provider, local}"}}}},
 			{Name: "move-asks", Optional: true, Description: "Copy rows of the controller's record of asks at a desk " +
 				"into the vault's, as they are and once, from the controller alone. No value is in any of them.",
 				Input: map[string]any{"type": "object", "properties": map[string]any{"asks": map[string]any{
@@ -248,6 +258,9 @@ var defaultSeats = append([]Seat{
 	// machine, and a group of them, recorded and ordered by its holder, which asks the controller for each act.
 	// What it says it says as its module (`mesh-delivery.transition`), through the runtime that launches it.
 	{Name: DeliverySeat, Scope: ScopeMesh, Serves: deliveryVerbs(), Decision: "novox/hq ADR 0239"},
+	// Placement (novox/hq ADR 0567): which module runs on which node, state on the bus held by the assigner, changed only by
+	// a proposal the nodes answer and the operator approves. Its states and events are the holder module's.
+	{Name: PlacementSeat, Scope: ScopeMesh, Serves: placementVerbs(), Decision: "novox/hq ADR 0567"},
 	// Deferred renames (novox/hq ADR 0121): these deliver a provision, so renaming them is a
 	// delivering-seat migration with a mesh-wide cascade if a holder stops resolving mid-flight.
 	// They keep their names until that migration is done deliberately, apart from the node-* pass.

go/catalogue/seats_test.go

@@ -1,6 +1,7 @@
 package catalogue
 
 import (
+	"reflect"
 	"regexp"
 	"strings"
 	"testing"
@@ -43,6 +44,11 @@ func TestTheSeatsAreAClosedSetAndEachNamesItsDecision(t *testing.T) {
 			delivered[s.Delivers] = s.Name
 		}
 	}
+	// Forty-seven with mesh-placement (novox/hq ADR 0567), serving its seven verbs.
+	if s, ok := SeatNamed(PlacementSeat); !ok || s.Scope != ScopeMesh || !reflect.DeepEqual(VerbNames(s.Serves),
+		[]string{"placement", "proposals", "propose", "withdraw", "again", "adopt", "hand-back"}) {
+		t.Errorf("the placement seat is %v, %v", ok, s)
+	}
 	// Forty-six with the three build seats replacing node-build-agent and the retired mesh-build-machine (novox/hq
 	// ADR 0525 §2, §10); forty-five with node-files (novox/hq ADR 0394); forty-four again once node-reads goes.
 	// Forty-four with node-provisioner (novox/hq ADR 0349 clause 3); forty-three with mesh-provisioner (novox/hq ADR 0349 clause 3); forty-two with mesh-config (novox/hq ADR 0348 §9); forty-one with node-reads (novox/hq ADR 0310); forty with node-nfs-server and node-mounts (novox/hq ADR 0263); thirty-eight with node-resolver (novox/hq ADR 0247); thirty-seven with mesh-delivery (novox/hq ADR 0239); thirty-six since node-resolver-config retired
@@ -56,8 +62,8 @@ func TestTheSeatsAreAClosedSetAndEachNamesItsDecision(t *testing.T) {
 	// node-container-runtime (ADR 0207); nineteen with node-environment and node-login-shell (ADR 0203,
 	// ADR 0204); seventeen with node-build-agent (ADR 0190). One fewer once the retired
 	// mesh-build-machine row goes, when no registered manifest claims it.
-	if len(Seats()) != 46 {
-		t.Errorf("the mesh defines %d seats rather than 46; the set is closed, so a change here is "+
+	if len(Seats()) != 47 {
+		t.Errorf("the mesh defines %d seats rather than 47; the set is closed, so a change here is "+
 			"a decision (novox/hq ADR 0110): %s", len(Seats()), seatNames())
 	}
 }

go/catalogue/setting_into.go

@@ -51,6 +51,8 @@ type UnsetSettingError struct {
 	// where says what asks for it — "a file", "a service whose unit", "a directory <id> whose owner" — and
 	// setToday which of the module's keys a layer sets, for saying it again in the config form's words.
 	where, setToday string
+	// field is the key of a contribution whose value asks for it, where the contribution's words are made by its caller.
+	field string
 }
 
 func (e *UnsetSettingError) Error() string { return e.said }

go/catalogue/settings.go

@@ -5,6 +5,7 @@ import (
 	"crypto/x509"
 	"encoding/json"
 	"encoding/pem"
+	"errors"
 	"fmt"
 	"regexp"
 	"sort"
@@ -129,7 +130,36 @@ func ApplySettings(resource map[string]any, layers []Layer) (map[string]any, err
 // contract. Until issue 696, a layer replaced any served key it named; influxdb on ace was the one
 // layer relying on it, and serves `${setting:org}` and `${setting:bucket}` since.
 func Settle(base map[string]any, layers []Layer) (map[string]any, error) {
-	return filledFromSettings(deepCopy(base), layers, "what is served")
+	out, err := filledFromSettings(deepCopy(base), layers, "what is served")
+	if err != nil {
+		// Said as it was, untyped: what is served names no module here to type it by.
+		return nil, errors.New(err.Error())
+	}
+	return out, nil
+}
+
+// ServedSettings is every key a module's served values and its zone's name fill from its settings (`${setting:<key>}`
+// in a top-level string, as Settle fills them), sorted: what every consumer of the module is told, wherever it runs,
+// and so the one part of a module's config values on its node that a node composing a consumer elsewhere reads (issue
+// 1126). None for a module that serves only literals.
+func ServedSettings(m Manifest) []string {
+	seen := map[string]bool{}
+	note := func(v any) {
+		if s, ok := v.(string); ok {
+			for _, k := range settingsUsed(s) {
+				seen[k] = true
+			}
+		}
+	}
+	for _, values := range m.Serves {
+		for _, v := range values {
+			note(v)
+		}
+	}
+	if m.Zone != nil {
+		note(m.Zone.Name)
+	}
+	return sortedKeys(seen)
 }
 
 // overridden lays settings over a contribution: a map whose keys are its contract. Only the keys the
@@ -169,10 +199,12 @@ func filledFromSettings(merged map[string]any, layers []Layer, what string) (map
 		for _, asked := range settingsUsed(s) {
 			v, set := settingValue(layers, asked)
 			if !set {
-				return nil, fmt.Errorf(
+				// Typed, its module and where left to the caller that knows them (Resolution.composed), so a module in
+				// the config form is refused in its own words (unsetInConfigWords; issue 1126, seed-8).
+				return nil, &UnsetSettingError{Setting: asked, field: key, setToday: orNoSettings(layers), said: fmt.Sprintf(
 					"%s says ${setting:%s} for %q, and nothing sets %q — an operator's value is the "+
 						"assignment's, never the definition's (novox/hq ADR 0112)%s",
-					what, asked, key, asked, orNoSettings(layers))
+					what, asked, key, asked, orNoSettings(layers))}
 			}
 			s = strings.ReplaceAll(s, "${setting:"+asked+"}", plainly(v))
 		}

go/catalogue/vault_seat_test.go

@@ -121,6 +121,8 @@ func TestTheVaultsSeatPromisesTheMove(t *testing.T) {
 		"move-in": {"node", "module", "name", "provider", "provision", "consumer", "consumer_module", "local", "origin",
 			"generation", "made_at", "call", "sealed", "read_back_to"},
 		"move-asks": {"asks"},
+		// And own (issue 1126): a machine's node-engine asks its own machine's secrets, sealed to its stated key.
+		"own": {"credentials"},
 	}
 	for name, args := range want {
 		var verb *Verb
@@ -148,7 +150,7 @@ func TestTheVaultsSeatPromisesTheMove(t *testing.T) {
 	}
 	serving := Manifest{Module: "mesh-vault", Provides: []Offer{{Name: "secret", Scope: ScopeMesh}},
 		Claims: []Claim{{Name: "mesh-vault", Scope: ScopeMesh,
-			Serves: []string{"get", "accept", "secret-ask", "issued", "rotate", "move-in", "move-asks"}}}}
+			Serves: []string{"get", "accept", "secret-ask", "issued", "rotate", "move-in", "node-key", "move-asks", "own"}}}}
 	if err := CanHold(serving, seat); err != nil {
 		t.Fatalf("the vault serving the move was refused: %v", err)
 	}

go/cmd/placement-seed/main.go

@@ -1,139 +0,0 @@
-// placement-seed writes the catalogue's first placement files (novox/hq ADR 0549 §4, ADR 0555 §6, issue 1126) from the
-// answer of the controller's one read-only verb `placement-export`: one `placement/<node>.json` per node, each the
-// node's placement as the controller's own code read it from its own store, checked as the catalogue's check checks it
-// (delivery.CheckPlacements) before anything is written. The pull request it makes merges only when its composition check
-// composes every node equal to what it runs.
-//
-//	placement-seed -catalogue <checkout of mesh-catalog> < export.json
-//	placement-seed -catalogue <dir> -export export.json
-//
-// export.json is the verb's answer as it prints it ({"<node>": <placement>, ...}, or the verb's wrapping with it under
-// "answer"). It opens no network connection, bus or store; it writes only <dir>/placement/<node>.json, and refuses to
-// write over a placement file already there. Exit codes: 0 written; 1 the export cannot be read, is refused by the
-// check, or a file is there; 2 the flags are wrong.
-package main
-
-import (
-	"encoding/json"
-	"errors"
-	"flag"
-	"fmt"
-	"io"
-	"os"
-	"path/filepath"
-	"sort"
-
-	"git.novox.be/novox/mesh-sdk/go/delivery"
-)
-
-func main() {
-	catalogue := flag.String("catalogue", "", "the checkout of the catalogue to write placement/<node>.json into")
-	export := flag.String("export", "", "the verb's answer; standard input when absent")
-	flag.Parse()
-	if *catalogue == "" || flag.NArg() > 0 {
-		fmt.Fprintln(os.Stderr, "usage: placement-seed -catalogue <dir> [-export <file>]")
-		os.Exit(2)
-	}
-	in := io.Reader(os.Stdin)
-	if *export != "" {
-		f, err := os.Open(*export)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			os.Exit(1)
-		}
-		defer f.Close()
-		in = f
-	}
-	written, err := Seed(in, *catalogue)
-	for _, path := range written {
-		fmt.Println(path)
-	}
-	if err != nil {
-		fmt.Fprintln(os.Stderr, "placement-seed:", err)
-		os.Exit(1)
-	}
-}
-
-// Seed reads the export and writes each node's placement file under root, answering the paths written. Nothing is
-// written when the export does not read, the check refuses it, or a placement file is already there.
-func Seed(export io.Reader, root string) ([]string, error) {
-	raw, err := io.ReadAll(export)
-	if err != nil {
-		return nil, err
-	}
-	placements, err := read(raw)
-	if err != nil {
-		return nil, err
-	}
-	all := func(string) bool { return true }
-	if refused := delivery.CheckPlacements(placements, all, all); len(refused) > 0 {
-		return nil, fmt.Errorf("the export is refused by the catalogue's check: %v", refused)
-	}
-	nodes := make([]string, 0, len(placements))
-	for node := range placements {
-		nodes = append(nodes, node)
-	}
-	sort.Strings(nodes)
-	files := map[string][]byte{}
-	for _, node := range nodes {
-		p := placements[node]
-		p.Revision = "" // only the indexer writes a revision, into the key
-		if _, err := delivery.EncodePlacement(p); err != nil {
-			return nil, fmt.Errorf("%s: %w", node, err)
-		}
-		p.V = delivery.Version
-		body, err := json.MarshalIndent(p, "", "  ")
-		if err != nil {
-			return nil, err
-		}
-		path := filepath.Join(root, filepath.FromSlash(delivery.PlacementFile(node)))
-		if _, err := os.Stat(path); err == nil {
-			return nil, fmt.Errorf("%s is already there; the seed is written once (ADR 0549 §4)", path)
-		} else if !errors.Is(err, os.ErrNotExist) {
-			return nil, err
-		}
-		files[path] = append(body, '\n')
-	}
-	var written []string
-	for _, node := range nodes {
-		path := filepath.Join(root, filepath.FromSlash(delivery.PlacementFile(node)))
-		if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
-			return written, err
-		}
-		if err := os.WriteFile(path, files[path], 0o644); err != nil {
-			return written, err
-		}
-		written = append(written, path)
-	}
-	return written, nil
-}
-
-// read is the export as the verb prints it, or wrapped as a verb's answer (the controller's verbAnswer: its JSON under
-// "answer").
-func read(raw []byte) (map[string]delivery.Placement, error) {
-	var wrapped struct {
-		Answer json.RawMessage `json:"answer"`
-	}
-	if json.Unmarshal(raw, &wrapped) == nil && len(wrapped.Answer) > 0 {
-		raw = wrapped.Answer
-	}
-	var byNode map[string]json.RawMessage
-	if err := json.Unmarshal(raw, &byNode); err != nil {
-		return nil, fmt.Errorf("the export is not {<node>: <placement>}: %w", err)
-	}
-	if len(byNode) == 0 {
-		return nil, errors.New("the export names no node")
-	}
-	out := map[string]delivery.Placement{}
-	for node, body := range byNode {
-		p, err := delivery.DecodePlacement(body)
-		if err != nil {
-			return nil, fmt.Errorf("%s: %w", node, err)
-		}
-		if p.Node != node {
-			return nil, fmt.Errorf("the export's placement of %s names the node %q", node, p.Node)
-		}
-		out[node] = p
-	}
-	return out, nil
-}

go/cmd/placement-seed/main_test.go

@@ -1,61 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-
-	"git.novox.be/novox/mesh-sdk/go/compose"
-	"git.novox.be/novox/mesh-sdk/go/compose/frombus"
-	"git.novox.be/novox/mesh-sdk/go/delivery"
-)
-
-// Issue 1126 (ADR 0549 §4, ADR 0555 §6): the seed writes one placement file per node of the export, as the catalogue's
-// check and the indexer read it, from the verb's answer bare or wrapped; it writes nothing for an export the check
-// refuses, and never over a file already there.
-func TestTheSeedWritesEachNodesPlacementFileOnce(t *testing.T) {
-	export := `{"answer":{"ace":{"v":1,"node":"ace","revision":"x","decided":{"address":"10.77.0.2"},"modules":[{"module":"plex","ports":{"32400":32400}}]},` +
-		`"novox":{"v":1,"node":"novox","decided":{"hub":true,"address":"10.77.0.1"},"modules":[]}}}`
-	root := t.TempDir()
-	written, err := Seed(strings.NewReader(export), root)
-	if err != nil || len(written) != 2 {
-		t.Fatalf("written %v, %v", written, err)
-	}
-	raw, err := os.ReadFile(filepath.Join(root, "placement", "ace.json"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	p, err := delivery.DecodePlacement(raw)
-	if err != nil || p.Node != "ace" || p.Revision != "" || p.HostPorts()["plex"][32400] != 32400 {
-		t.Errorf("ace's file reads %+v, %v", p, err)
-	}
-	if _, err := Seed(strings.NewReader(export), root); err == nil || !strings.Contains(err.Error(), "already there") {
-		t.Errorf("a second seed over the files: %v", err)
-	}
-	clash := `{"ace":{"v":1,"node":"ace","decided":{"address":"10.77.0.1"},"modules":[]},"novox":{"v":1,"node":"novox","decided":{"address":"10.77.0.1"},"modules":[]}}`
-	other := t.TempDir()
-	if _, err := Seed(strings.NewReader(clash), other); err == nil || !strings.Contains(err.Error(), "both have the address") {
-		t.Errorf("an export the check refuses: %v", err)
-	}
-	if entries, _ := os.ReadDir(filepath.Join(other, "placement")); len(entries) != 0 {
-		t.Errorf("a refused export wrote %v", entries)
-	}
-	// What the controller's placement-export prints, frombus.Export per node, is what the seed takes: a node with no
-	// module placed included.
-	in := compose.Input{Nodes: []compose.Node{{Name: "solo", Place: compose.Place{Hub: true, Address: "10.77.0.9"}}}}
-	exported, err := frombus.Export(in, "solo")
-	if err != nil {
-		t.Fatal(err)
-	}
-	answer, _ := json.Marshal(map[string]any{"answer": map[string]delivery.Placement{"solo": exported}})
-	if written, err := Seed(strings.NewReader(string(answer)), t.TempDir()); err != nil || len(written) != 1 {
-		t.Errorf("Export's answer %s was not seeded: %v, %v", answer, written, err)
-	}
-	for _, bad := range []string{`[]`, `{}`, `{"ace":{"v":1,"node":"novox","modules":[]}}`} {
-		if _, err := Seed(strings.NewReader(bad), t.TempDir()); err == nil {
-			t.Errorf("%s was seeded", bad)
-		}
-	}
-}

go/compose/composed.go

@@ -4,21 +4,28 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"slices"
 	"sort"
 	"strings"
 
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"git.novox.be/novox/mesh-sdk/go/declaration"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/overlay"
 )
 
 // Compositions is one node's compositions (novox/hq ADR 0539 clauses 1 and 2): its declaration composed over in, as
 // the controller composes it, split into each module's composition at the fingerprint fps gives it and the node's own
 // (`<node>.node`), by key (delivery.ComposedKey). Each resource says its module, whatever the node reported it reads.
 // A module fps gives no fingerprint for is not composed and is named in skipped, so a caller composing one module
-// (mesh-hand-compose) gets that one. Each module's Data says whether its manifest declares data. The compositions are not
+// (mesh-hand-compose) gets that one; but for a module the node runs inside its own composition (Node.InOwn, and the
+// private network's always), which fps names at no fingerprint of the new form: its resources go into the node's own,
+// their module taken off and their ids still naming it, and its filled paths with them, as the controller's composed
+// writer folds them (issue 1126). Each module's Data says whether its manifest declares data. The compositions are not
 // signed and not yet by digest: the writer does both (delivery.SignComposed, Composed.ByDigest).
 func Compositions(in Input, node string, fps map[string]string, mode Mode) (out map[string]delivery.Composed, skipped []string, err error) {
-	return compositions(in, node, fps, mode, false)
+	out, skipped, _, err = compositions(in, node, fps, mode, false)
+	return out, skipped, err
 }
 
 // ErrStoodIn is a composition that holds a stand-in for a value the input does not carry (an own secret, a grant's
@@ -34,50 +41,127 @@ const BusUsersStandIn = "the bus's user list"
 // ErrStoodIn, naming each, so a stand-in is never applied as if it were the value; but for the bus's user list
 // (BusUsersStandIn), which the bus node holds out of every apply of a composition it made itself.
 func CompositionsApplied(in Input, node string, fps map[string]string) (map[string]delivery.Composed, []string, error) {
-	return compositions(in, node, fps, Reading, true)
+	out, skipped, _, err := compositions(in, node, fps, Reading, true)
+	return out, skipped, err
 }
 
-func compositions(in Input, node string, fps map[string]string, mode Mode, applied bool) (out map[string]delivery.Composed, skipped []string, err error) {
+// CompositionsShadow is CompositionsApplied for a composition that is compared and never applied (a node's answer to a
+// placement candidate, novox/hq ADR 0559 §4): composed in the Foreseeing mode, so an own secret never issued (a module
+// the candidate adds) is a named stand-in rather than an error, and what it stands in for is answered (stood, sorted,
+// the bus's user list left out) rather than refused, so the caller judges each stand-in: a value not yet issued for a
+// module the candidate adds, or one missing for a module the node runs. A module whose every value is held composes
+// as CompositionsApplied composes it: the modes differ only in an own secret never issued.
+func CompositionsShadow(in Input, node string, fps map[string]string) (out map[string]delivery.Composed, skipped, stood []string, err error) {
+	return compositions(in, node, fps, Foreseeing, false)
+}
+
+// CompositionsIn is the node's compositions in mode with what they stand in for answered (stood, sorted, the bus's user
+// list left out) rather than refused: CompositionsShadow in Foreseeing, and in Reading what CompositionsApplied refuses
+// before it is refused, so a caller that applies refuses each stand-in to the module it is for alone (issue 1126).
+func CompositionsIn(in Input, node string, fps map[string]string, mode Mode) (out map[string]delivery.Composed, skipped, stood []string, err error) {
+	return compositions(in, node, fps, mode, false)
+}
+
+func compositions(in Input, node string, fps map[string]string, mode Mode, applied bool) (out map[string]delivery.Composed, skipped, stood []string, err error) {
 	reading := in
 	reading.Nodes = append([]Node(nil), in.Nodes...)
 	found := false
+	inOwn := map[string]bool{}
+	held := map[string]bool{}
 	for i := range reading.Nodes {
 		if reading.Nodes[i].Name == node {
 			reading.Nodes[i].ReadsModules = true
 			found = true
+			for m, ok := range reading.Nodes[i].InOwn {
+				inOwn[m] = ok
+			}
+			for m, ok := range reading.Nodes[i].Held {
+				held[m] = ok
+			}
 		}
 	}
+	// The private network's module is built by nobody: no fingerprint of the new form ever names it.
+	inOwn[overlay.Name] = true
+	folds := func(module string) bool {
+		return module != "" && inOwn[module] && !strings.HasPrefix(fps[module], delivery.SourcePrefix2)
+	}
 	if !found {
-		return nil, nil, fmt.Errorf("compose: the mesh has no node %q", node)
+		return nil, nil, nil, fmt.Errorf("compose: the mesh has no node %q", node)
+	}
+	// A folded module built by a build of the old form (Node.RunsOwn) is left to the node: composed from what runs of it
+	// (Carried), so what it provides and requires still shapes the rest and what the others read of it (its published
+	// ports, the paths it owns) is what runs, and its resources are then the ones the node runs.
+	carried := map[string]bool{}
+	var runsOwn *delivery.Composed
+	for i := range reading.Nodes {
+		n := &reading.Nodes[i]
+		if n.Name != node || n.RunsOwn == nil {
+			continue
+		}
+		runsOwn = n.RunsOwn
+		candidates := map[string]bool{}
+		for m := range inOwn {
+			candidates[m] = true
+		}
+		for m := range held {
+			candidates[m] = true
+		}
+		for m := range candidates {
+			// A held module is carried as it runs wherever the node's own runs it, folded or leaving the fold for a
+			// composition of its own (its want new, its names still unset): its stub is never what the node's own applies,
+			// and what the node's own applies never drops what runs of it (issue 1126, review of the apply; issue 1945).
+			heldHere := held[m] && RunsAnyOf(runsOwn, m)
+			if !folds(m) && !heldHere {
+				continue
+			}
+			man, ok := n.Kept[m]
+			if !ok {
+				man, ok = reading.Catalogue[m]
+			}
+			if !ok || (!NamesBuild(man) && !held[m]) {
+				continue
+			}
+			carried[m] = true
+			kept := make(map[string]catalogue.Manifest, len(n.Kept)+1)
+			for k, v := range n.Kept {
+				kept[k] = v
+			}
+			kept[m] = Carried(man, m, runsOwn)
+			n.Kept = kept
+		}
+	}
+	isCarried := func(module, id string) bool {
+		if module == "" {
+			module, _ = declaration.ModuleGuess(id)
+		}
+		return carried[module]
 	}
 	d, problems, err := ComposeIn(reading, node, mode)
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	if len(problems) > 0 {
-		return nil, nil, fmt.Errorf("compose: %s's declaration is refused by the node-engine's validator: %v", node, problems)
+		return nil, nil, nil, fmt.Errorf("compose: %s's declaration is refused by the node-engine's validator: %v", node, problems)
 	}
-	if applied {
-		var stood []string
-		for _, x := range d.StoodIn {
-			// The bus's user list is the bus node's own to follow, written alone and never from a composition the node
-			// made itself (ADR 0547 §7, §8): its stand-in is held out of the apply, not applied.
-			if x != BusUsersStandIn {
-				stood = append(stood, x)
-			}
-		}
-		stood = append(stood, d.Foreseen...)
-		for _, p := range d.ForeseenPorts {
-			stood = append(stood, "port "+p)
-		}
-		if len(stood) > 0 {
-			sort.Strings(stood)
-			return nil, nil, fmt.Errorf("%w on %s: %s", ErrStoodIn, node, strings.Join(stood, ", "))
+	for _, x := range d.StoodIn {
+		// The bus's user list is the bus node's own to follow, written alone and never from a composition the node
+		// made itself (ADR 0547 §7, §8): its stand-in is held out of the apply, not applied.
+		if x != BusUsersStandIn {
+			stood = append(stood, x)
 		}
 	}
+	stood = append(stood, d.Foreseen...)
+	for _, p := range d.ForeseenPorts {
+		stood = append(stood, "port "+p)
+	}
+	sort.Strings(stood)
+	stood = slices.Compact(stood) // an own secret is both stood in for and foreseen
+	if applied && len(stood) > 0 {
+		return nil, nil, nil, fmt.Errorf("%w on %s: %s", ErrStoodIn, node, strings.Join(stood, ", "))
+	}
 	body, err := d.Body()
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	var envelope struct {
 		Resources   []json.RawMessage     `json:"resources"`
@@ -86,19 +170,41 @@ func compositions(in Input, node string, fps map[string]string, mode Mode, appli
 		Provisioner string                `json:"provisioner_account"`
 	}
 	if err := json.Unmarshal(body, &envelope); err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	var kept []json.RawMessage
 	keptPaths := map[string]bool{}
+	foldedPaths := map[string]bool{}
 	left := map[string]bool{}
 	for _, raw := range envelope.Resources {
 		var head struct {
+			ID     string `json:"id"`
 			Module string `json:"module"`
 			Type   string `json:"type"`
 			Path   string `json:"path"`
 		}
 		if err := json.Unmarshal(raw, &head); err != nil {
-			return nil, nil, err
+			return nil, nil, nil, err
+		}
+		if isCarried(head.Module, head.ID) {
+			continue // what the stub composed of it: the node's own carries what runs of it instead
+		}
+		if folds(head.Module) {
+			// Into the node's own, in its place among the node's resources, its module taken off (mesh-controller's
+			// compositionsOf): the node's own composition is then the controller's, byte for byte.
+			var fields map[string]json.RawMessage
+			if err := json.Unmarshal(raw, &fields); err != nil {
+				return nil, nil, nil, err
+			}
+			delete(fields, "module")
+			if raw, err = json.Marshal(fields); err != nil {
+				return nil, nil, nil, err
+			}
+			if head.Type == string(declaration.TypeFile) {
+				foldedPaths[head.Path] = true
+			}
+			kept = append(kept, raw)
+			continue
 		}
 		if _, ok := fps[head.Module]; head.Module != "" && !ok {
 			left[head.Module] = true
@@ -109,18 +215,48 @@ func compositions(in Input, node string, fps map[string]string, mode Mode, appli
 		}
 		kept = append(kept, raw)
 	}
-	var filled []string
+	// What runs of each carried module, in the node's own composition, each after the resource it runs after.
+	if len(carried) > 0 {
+		var err error
+		if kept, foldedPaths, err = carry(kept, foldedPaths, runsOwn, isCarried); err != nil {
+			return nil, nil, nil, err
+		}
+		for _, p := range runsOwn.Filled {
+			if foldedPaths[p] && !slices.Contains(envelope.Filled, p) {
+				envelope.Filled = append(envelope.Filled, p)
+			}
+		}
+	}
+	// A filled file of a module's own composition goes with that module (SplitComposed); one of a folded module goes with
+	// the node's own, after them, in the declaration's order; one of a module left out is dropped.
+	var filled, ownFilled []string
 	for _, p := range envelope.Filled {
-		if keptPaths[p] {
+		switch {
+		case foldedPaths[p]:
+			ownFilled = append(ownFilled, p)
+		case keptPaths[p]:
 			filled = append(filled, p)
 		}
 	}
 	out, err = delivery.SplitComposed(node, kept, fps, filled,
 		delivery.NodeOwn{Adoption: envelope.Adoption, Provisioner: envelope.Provisioner})
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
+	}
+	if len(ownFilled) > 0 {
+		own, err := delivery.ComposedNodeKey(node)
+		if err != nil {
+			return nil, nil, nil, err
+		}
+		c := out[own]
+		c.Filled = append(c.Filled, ownFilled...)
+		out[own] = c
 	}
 	for key, c := range out {
+		if held[c.Module] {
+			delete(out, key) // its stub's: the node keeps what it last applied of it (Node.Held)
+			continue
+		}
 		if m, ok := in.Catalogue[c.Module]; ok && c.Module != "" {
 			c.Data = len(m.DataItems()) > 0
 			out[key] = c
@@ -130,5 +266,167 @@ func compositions(in Input, node string, fps map[string]string, mode Mode, appli
 		skipped = append(skipped, m)
 	}
 	sort.Strings(skipped)
-	return out, skipped, nil
+	return out, skipped, stood, nil
+}
+
+// RunsAnyOf says runs (a composition as it runs) holds a resource of module, by its module or the module its id names.
+func RunsAnyOf(runs *delivery.Composed, module string) bool {
+	if runs == nil {
+		return false
+	}
+	for _, raw := range runs.Resources {
+		var head struct {
+			ID     string `json:"id"`
+			Module string `json:"module"`
+		}
+		if json.Unmarshal(raw, &head) != nil {
+			continue
+		}
+		owner := head.Module
+		if owner == "" {
+			owner, _ = declaration.ModuleGuess(head.ID)
+		}
+		if owner == module {
+			return true
+		}
+	}
+	return false
+}
+
+// NamesBuild says a manifest names what a build makes: its build, or a resource naming an artifact. A node cannot
+// compose such a module folded into its own composition: the build of the old form it runs is held by the controller
+// alone (issue 1126).
+func NamesBuild(m catalogue.Manifest) bool {
+	if m.Build != nil {
+		return true
+	}
+	for _, r := range m.Resources {
+		if _, ok := r["artifact"]; ok {
+			return true
+		}
+	}
+	return false
+}
+
+// Stub is m with nothing to build and no resource but its directories: what it provides, requires, serves and grants
+// still shape the rest of the composition, the places its own secrets, data and grants name (${dir:…}) still resolve,
+// and nothing else of its own is composed (issue 1126: nats's ${dir:mesh-state} on novox). A module refused in a
+// node's answer is composed so; a folded one the node runs is Carried.
+func Stub(m catalogue.Manifest) catalogue.Manifest {
+	// The paths it owns stay its manifest's, as the controller tells the holder of node-files them (issue 1126, seed-8).
+	if m.OwnsPaths == nil {
+		m.OwnsPaths = catalogue.DeclaredPaths(m)
+	}
+	m.Build = nil
+	var dirs []map[string]any
+	for _, r := range m.Resources {
+		if r["type"] == "directory" {
+			dirs = append(dirs, r)
+		}
+	}
+	m.Resources = dirs
+	return m
+}
+
+// Carried is m, folded into its node's own composition at a build of the old form, as the node runs it (issue 1126,
+// C5): nothing to build; its containers and directories those the node's own composition (runs) carries of it, their
+// module's word taken off their ids, with the manifest's directories it does not run. So what other modules read of it
+// is what runs: the machine ports its containers publish (the filter's rules, the routes reaching it: MachineSide). The
+// paths it owns, which the holder of node-files is told, are its manifest's, as for its Stub: the controller composes
+// them from the manifest, not from every path a resource of it runs at (issue 1126, seed-8: f1-circuits, snake and
+// txt-game on ace, whose manifests leave their directories to the mesh). Its other resources are not taken, since the
+// composition makes some of them again from its manifest (its secrets' files) and one id twice is refused; none of them
+// is composed into what is applied either way (compositions leaves a carried module's out, and carries the ones that
+// run). What it provides, requires, listens on and grants is its manifest's. A module whose resources runs holds none
+// of is its Stub, as before.
+func Carried(m catalogue.Manifest, module string, runs *delivery.Composed) catalogue.Manifest {
+	if runs == nil {
+		return Stub(m)
+	}
+	var taken []map[string]any
+	runsAny := false
+	ids := map[string]bool{}
+	for _, raw := range runs.Resources {
+		var r map[string]any
+		if json.Unmarshal(raw, &r) != nil {
+			continue
+		}
+		id, _ := r["id"].(string)
+		owner, _ := r["module"].(string)
+		if owner == "" {
+			owner, _ = declaration.ModuleGuess(id)
+		}
+		if owner != module {
+			continue
+		}
+		runsAny = true
+		if typ := r["type"]; typ != "container" && typ != "directory" {
+			continue
+		}
+		r["id"] = strings.TrimPrefix(id, module+".")
+		delete(r, "module")
+		ids[r["id"].(string)] = true
+		taken = append(taken, r)
+	}
+	if !runsAny {
+		return Stub(m)
+	}
+	stub := Stub(m)
+	for _, r := range stub.Resources {
+		if id, _ := r["id"].(string); !ids[id] {
+			taken = append(taken, r)
+		}
+	}
+	stub.Resources = taken
+	return stub
+}
+
+// carry puts into the node's resources (kept, in the declaration's order) the resources of the node's own composition as
+// it runs (runs) that belong to a carried module, each after the resource it runs after, or first when that one is
+// not among them; a file among them is a folded path.
+func carry(kept []json.RawMessage, foldedPaths map[string]bool, runs *delivery.Composed, carried func(module, id string) bool) ([]json.RawMessage, map[string]bool, error) {
+	idOf := func(raw json.RawMessage) (string, string, string, string, error) {
+		var head struct {
+			ID     string `json:"id"`
+			Module string `json:"module"`
+			Type   string `json:"type"`
+			Path   string `json:"path"`
+		}
+		err := json.Unmarshal(raw, &head)
+		return head.ID, head.Module, head.Type, head.Path, err
+	}
+	present := map[string]bool{}
+	for _, raw := range kept {
+		if id, module, _, _, err := idOf(raw); err == nil && module == "" {
+			present[id] = true
+		}
+	}
+	// By the id of the resource of the node's own it runs after, "" for first: the last one before it that is composed.
+	after := map[string][]json.RawMessage{}
+	anchor := ""
+	for _, raw := range runs.Resources {
+		id, module, typ, path, err := idOf(raw)
+		if err != nil {
+			return nil, nil, fmt.Errorf("compose: a resource the node runs in its own composition: %w", err)
+		}
+		if !carried(module, id) {
+			if module == "" && present[id] {
+				anchor = id
+			}
+			continue
+		}
+		after[anchor] = append(after[anchor], raw)
+		if typ == string(declaration.TypeFile) {
+			foldedPaths[path] = true
+		}
+	}
+	out := make([]json.RawMessage, 0, len(kept)+len(runs.Resources))
+	out = append(out, after[""]...)
+	for _, raw := range kept {
+		out = append(out, raw)
+		if id, module, _, _, err := idOf(raw); err == nil && module == "" {
+			out = append(out, after[id]...)
+		}
+	}
+	return out, foldedPaths, nil
 }

go/compose/composed_test.go

@@ -58,15 +58,41 @@ func TestCompositionsAreTheDeclarationSplitByModule(t *testing.T) {
 		t.Errorf("the compositions hold %v, the declaration %v", got, want)
 	}
 
-	one, skipped, err := Compositions(in, "laptop", map[string]string{"files": fpFor('b')}, Foreseeing)
-	if err != nil || strings.Join(skipped, ",") != "mesh-wireguard" {
+	one, skipped, err := Compositions(in, "laptop", map[string]string{"mesh-wireguard": fpFor('a')}, Foreseeing)
+	if err != nil || strings.Join(skipped, ",") != "files" {
 		t.Fatalf("one module: %v, skipped %v", err, skipped)
 	}
 	for _, c := range one {
-		if c.Module == "mesh-wireguard" {
+		if c.Module == "files" {
 			t.Errorf("a module given no fingerprint was composed")
 		}
 	}
+
+	// Issue 1126: a module the node runs inside its own composition (Node.InOwn), and the private network's always,
+	// given no fingerprint of the new form, is folded into the node's own as the controller's composed writer folds it:
+	// every resource in its place, its module taken off, its id still naming it, nothing skipped.
+	folding := in
+	folding.Nodes = append([]Node(nil), in.Nodes...)
+	for i := range folding.Nodes {
+		if folding.Nodes[i].Name == "laptop" {
+			folding.Nodes[i].InOwn = map[string]bool{"files": true}
+		}
+	}
+	all, skipped, err := Compositions(folding, "laptop", nil, Foreseeing)
+	nodeKey, _ := delivery.ComposedNodeKey("laptop")
+	if err != nil || len(skipped) != 0 || len(all) != 1 || len(all[nodeKey].Resources) != len(want) {
+		t.Fatalf("folded: %v, skipped %v, %d compositions, %d of %d resources in the node's own", err, skipped, len(all), len(all[nodeKey].Resources), len(want))
+	}
+	for i, raw := range all[nodeKey].Resources {
+		var r map[string]any
+		_ = json.Unmarshal(raw, &r)
+		if _, says := r["module"]; says || r["id"] != d.Resources[i]["id"] {
+			t.Errorf("folded resource %d is %v, the declaration's %v", i, r["id"], d.Resources[i]["id"])
+		}
+	}
+	if _, err := delivery.EncodeComposed(all[nodeKey]); err != nil {
+		t.Errorf("the node's own with the folded modules: %v", err)
+	}
 	if _, _, err := Compositions(in, "nowhere", fps, Foreseeing); err == nil {
 		t.Errorf("a node the mesh does not have was composed")
 	}

go/compose/frombus/answer.go

@@ -0,0 +1,584 @@
+package frombus
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"slices"
+	"sort"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/declaration"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// Answer is a node's answer to its proposal's placement candidates (novox/hq ADR 0567 §3, ADR 0559 §4): s.Node composed in shadow with
+// s.Placements laid over the trunk's placement (compose.CompositionsShadow, its own sealed values and boxes through r as
+// for its own composition), compared with what it runs (delivery.CompareComposed). It applies nothing and writes
+// nothing; the proposal and the revision are the candidate's, said back in the answer.
+//
+// The node's own composition is compared only where the node runs one. fps gives the build each module is composed at: what the node runs, and for a module the candidate places that the
+// node does not run, the build the trunk holds; a placed module with none is added, with no build of it known. What the
+// composition stands in for is judged: a value of a module the proposal adds (on this node or another: its credential, own
+// secrets and boxes are made only once it is placed, ADR 0549 §5) is not yet issued, which is no refusal; any other
+// stand-in is a value missing for a module the node runs, a refusal naming it ("node" when it is the node's own).
+func Answer(ctx context.Context, r Reader, mesh Mesh, s Scope, fps map[string]string, running []delivery.Composed, proposal string, revision uint64) delivery.CandidateAnswer {
+	a := delivery.CandidateAnswer{Proposal: proposal, Revision: revision}
+	refuse := func(err error) delivery.CandidateAnswer {
+		a.Refused = err.Error()
+		a.Verdict = delivery.CandidateRefused
+		return a
+	}
+	trunk, err := r.Placements(ctx)
+	if err != nil {
+		return refuse(fmt.Errorf("frombus: placement: %w", err))
+	}
+	if s.Running == nil {
+		s.Running = running
+	}
+	// Every module it cannot compose is named, not the first only (issue 1126): a build it cannot read or take in, and
+	// below, a module the composition refuses, each composed as a stub so the rest is composed and compared.
+	failed := map[string]string{}
+	in, err := input(ctx, r, mesh, s, func(module string, err error) { failed[module] = err.Error() })
+	if err != nil {
+		return refuse(err)
+	}
+	asConsumer, asProvider, err := compose.CredentialsNeeded(in, s.Node)
+	if err != nil {
+		return refuse(err)
+	}
+	// What the node runs, by module. A consumer's credential is asked only for a module it runs: the vault refuses the
+	// whole ask for a consuming module not assigned to the node (mesh-vault's own), and a module the candidate adds is
+	// assigned only after the merge (ADR 0549 §5), so its credential is left missing, a stand-in answered as not yet
+	// issued under Added (review of L2b, round 1, finding 1).
+	runs := map[string]bool{}
+	for _, c := range running {
+		if c.Module != "" {
+			runs[c.Module] = true
+		}
+	}
+	var consumed []compose.CredentialKey
+	for _, k := range asConsumer {
+		if runs[k.ConsumerModule] {
+			consumed = append(consumed, k)
+		}
+	}
+	asConsumer = consumed
+	if len(asConsumer)+len(asProvider) > 0 {
+		if in.Credentials, in.Issued, err = r.Credentials(ctx, s.Node, asConsumer, asProvider); err != nil {
+			return refuse(fmt.Errorf("frombus: the credentials of %s: %w", s.Node, err))
+		}
+	}
+	composed, skipped, stood, err := composeEach(in, s.Node, fps, false, s.Running, failed)
+	if err != nil {
+		// Not one module's: the node's own (a value served elsewhere, the mesh's network), said once as the node's.
+		if len(failed) == 0 {
+			return refuse(err)
+		}
+		failed[delivery.HaveNodeWord] = err.Error()
+		composed, skipped, stood = nil, nil, nil
+	}
+	// The node's own composition is judged only where the node runs one: one that runs none applies it only once a want
+	// names it (the node agent's own composer hands it on that want alone), so a candidate does not add it.
+	runsOwn := false
+	for _, c := range running {
+		runsOwn = runsOwn || c.Module == ""
+	}
+	if !runsOwn {
+		for key, c := range composed {
+			if c.Module == "" {
+				delete(composed, key)
+			}
+		}
+	}
+	if _, whole := failed[delivery.HaveNodeWord]; whole {
+		// Nothing composed to compare: every refusal is said, and nothing else.
+		for _, m := range sortedKeys(failed) {
+			a.Refusals = append(a.Refusals, delivery.ModuleRefused{Module: m, Why: failed[m]})
+		}
+		a.Verdict = delivery.VerdictOf(a)
+		return a
+	}
+	// A module the composition folds inside the node's own is judged there: the agent also says it runs by module, from
+	// the declaration it kept before the switch (agent.Everything), which is no removal (issue 1126, seed #531).
+	if len(s.InOwn) > 0 {
+		var judged []delivery.Composed
+		for _, c := range running {
+			if c.Module == "" || !slices.Contains(s.InOwn, c.Module) {
+				judged = append(judged, c)
+			}
+		}
+		running = judged
+	}
+	cmp := delivery.CompareComposedWith(composed, running, s.SameValue)
+	// The answer rides in the node's have key: its shown bodies are bounded, the rest named only.
+	budget := MaxShown
+	for i := range cmp.Differs {
+		kept := cmp.Differs[i].Bodies[:0]
+		for _, b := range cmp.Differs[i].Bodies {
+			if n := len(b.Composed) + len(b.Running); n <= budget {
+				budget -= n
+				kept = append(kept, b)
+			} else {
+				kept = append(kept, delivery.ResourceBodies{ID: b.ID, Why: b.Why})
+				a.Note = "some differing resources are named without their bodies: the answer holds at most " +
+					fmt.Sprint(MaxShown) + " bytes of them"
+			}
+		}
+		cmp.Differs[i].Bodies = kept
+	}
+	// A refused module was composed as a stub: what it composed is no difference; its refusal is said.
+	notFailed := func(m string) bool { _, ok := failed[m]; return !ok }
+	a.Same = slices.DeleteFunc(cmp.Same, func(m string) bool { return !notFailed(m) })
+	a.Removed = slices.DeleteFunc(cmp.Removed, func(m string) bool { return !notFailed(m) })
+	a.Differs = slices.DeleteFunc(cmp.Differs, func(d delivery.ModuleDiffers) bool { return !notFailed(d.Module) })
+	cmp.Added = slices.DeleteFunc(cmp.Added, func(d delivery.ModuleAdded) bool { return !notFailed(d.Module) })
+	skipped = slices.DeleteFunc(skipped, func(m string) bool { return !notFailed(m) })
+
+	// What the proposal adds, by node and module: placed by a candidate and not by the trunk on that node.
+	added := map[string]bool{}
+	for node, p := range s.Placements {
+		if p == nil {
+			continue
+		}
+		was := map[string]bool{}
+		for _, m := range trunk[node].Modules {
+			was[m.Module] = true
+		}
+		for _, m := range p.Modules {
+			if !was[m.Module] {
+				added[node+"/"+m.Module] = true
+			}
+		}
+	}
+	unissued := map[string][]string{}
+	refusals := map[string][]string{}
+	for _, x := range stood {
+		node, module := standsInFor(x, s.Node)
+		switch {
+		case node == s.Node && runs[module]:
+			// A value missing for a module the node runs is a refusal, whatever the trunk places (the seed's trunk is
+			// empty, and every module counts as the group's).
+			refusals[module] = append(refusals[module], x)
+		case module != "" && added[node+"/"+module]:
+			if node == s.Node {
+				unissued[module] = append(unissued[module], x)
+			} // another node's addition: the module here that carries it differs, which the assigner judges
+		case module == "" || node != s.Node:
+			// The node's own, or a value this node holds for a module elsewhere (a grant it provides): said as the node's.
+			refusals[delivery.HaveNodeWord] = append(refusals[delivery.HaveNodeWord], x)
+		default:
+			refusals[module] = append(refusals[module], x)
+		}
+	}
+	addedHere := map[string]delivery.ModuleAdded{}
+	for _, m := range cmp.Added {
+		addedHere[m.Module] = m
+	}
+	for _, m := range skipped { // placed, and no build given to compose it at
+		addedHere[m] = delivery.ModuleAdded{Module: m, Unissued: []string{"no build of " + m + " is known to compose it at"}}
+	}
+	for m, xs := range unissued {
+		got := addedHere[m]
+		got.Module = m
+		got.Unissued = append(got.Unissued, xs...)
+		addedHere[m] = got
+	}
+	for _, m := range sortedKeys(addedHere) {
+		a.Added = append(a.Added, addedHere[m])
+	}
+	for _, m := range sortedKeys(refusals) {
+		if _, isAdded := addedHere[m]; isAdded {
+			continue // a module the candidate adds here: what it lacks is said under Added
+		}
+		if _, isFailed := failed[m]; isFailed {
+			continue // said below, as why it could not be composed
+		}
+		a.Refusals = append(a.Refusals, delivery.ModuleRefused{Module: m, Why: "stands in for " + strings.Join(refusals[m], ", ")})
+	}
+	for _, m := range sortedKeys(failed) {
+		a.Refusals = append(a.Refusals, delivery.ModuleRefused{Module: m, Why: failed[m]})
+	}
+	sort.Slice(a.Refusals, func(i, j int) bool { return a.Refusals[i].Module < a.Refusals[j].Module })
+	a.Verdict = delivery.VerdictOf(a)
+	return a
+}
+
+// maxCulprits bounds the modules one refusal is tried on, each a whole composition.
+const maxCulprits = 8
+
+// MaxShown bounds the bytes of shown resource bodies in one answer (delivery.ModuleDiffers.Bodies).
+const MaxShown = 256 << 10
+
+var (
+	grantStandIn = regexp.MustCompile(`^the grant of \S+ for (\S+) on (\S+)$`)
+	needsStandIn = regexp.MustCompile(`^(\S+) on (\S+) needs `)
+)
+
+// standsInFor is the node and module a stand-in of compose's words is for: an own secret `module/name`, a port
+// `port module:port`, a grant `the grant of <provision> for <module> on <node>`, a need `<module> on <node> needs ...`;
+// the module empty when the words name none (the certificate, the authority).
+func standsInFor(x, node string) (string, string) {
+	if m := grantStandIn.FindStringSubmatch(x); m != nil {
+		return m[2], m[1]
+	}
+	if m := needsStandIn.FindStringSubmatch(x); m != nil {
+		return m[2], m[1]
+	}
+	if rest, ok := strings.CutPrefix(x, "port "); ok {
+		if module, _, ok := strings.Cut(rest, ":"); ok {
+			return node, module
+		}
+	}
+	if module, _, ok := strings.Cut(x, "/"); ok && !strings.Contains(x, " ") {
+		return node, module
+	}
+	return node, ""
+}
+
+// composeEach is the one rule, for the node that applies and for its answer to a candidate alike, by which a module's
+// own refusal refuses that module and never the node (issue 1126: seed-8 fixed it in the answer alone, and the
+// applying path still refused all of novox for de-spiegel's unset route names). The node is composed; a refusal is laid
+// on the module whose stub (compose.Stub) changes it (culprit), that module is held (compose.Node.Held) and said in
+// failed with the refusal's words, and the rest is composed again, until it composes or the refusal is no single
+// module's, which is answered as the node's (err). Applied composes as the node applies (compose.Reading) and holds the
+// module placed here each stand-in is for; one for no module placed here (the node's own, a value this node holds for a
+// module elsewhere) refuses the node (compose.ErrStoodIn). Not applied, it composes in compose.Foreseeing and answers
+// every stand-in for the caller to judge (Answer).
+//
+// **A held module is what runs of it** (review of the apply, round 1): composed from what running holds of it
+// (compose.Carried of its own composition there; the node's own carries it wherever it runs there), so what the others
+// read of it (the machine ports its containers publish, the routes reaching it) is what runs, and none of its own
+// composition is in out: the node keeps what it last applied. **What depends on how it is held is held too:** a module
+// whose composition differs when the held ones are composed as their stubs instead is held with them, and a node's own
+// composition that differs (but for the held modules' own resources) refuses the node. And since a held module is
+// composed from its new manifest, which may not be the build's that runs, what reads that manifest is held with it
+// (dependents): the providers of what it contributes to (the proxy its routes), and, when it listens, the filter.
+func composeEach(in compose.Input, node string, fps map[string]string, applied bool, running []delivery.Composed, failed map[string]string) (out map[string]delivery.Composed, skipped, stood []string, err error) {
+	mode := compose.Foreseeing
+	if applied {
+		mode = compose.Reading
+	}
+	runs := map[string]*delivery.Composed{}
+	for i := range running {
+		if m := running[i].Module; m != "" {
+			runs[m] = &running[i]
+		}
+	}
+	src := map[string]catalogue.Manifest{} // each held module's manifest before it was held
+	bareOf := map[string]bool{}
+	var hold func(m, why string, bare bool)
+	hold = func(m, why string, bare bool) {
+		if _, done := failed[m]; !done {
+			failed[m] = why // a held module tried bare keeps the words it was first held for
+		}
+		first := false
+		if _, ok := src[m]; !ok {
+			man, ok := manifestOn(in, node, m)
+			if !ok {
+				return
+			}
+			src[m], first = man, true
+		}
+		bareOf[m] = bareOf[m] || bare
+		in = heldAs(in, node, m, src[m], bareOf[m], runs[m])
+		if !first {
+			return
+		}
+		// What the others read of its manifest (what it contributes, what it listens on) is its new manifest's, not
+		// necessarily the build's that runs: what reads it is held with it (review of the apply, round 2).
+		for _, r := range dependents(in, node, src[m], failed) {
+			hold(r, "it reads what "+m+" contributes or listens on, and "+m+" is held", false)
+		}
+	}
+	for _, m := range sortedKeys(failed) {
+		hold(m, failed[m], false)
+	}
+	for {
+		out, skipped, stood, err = compose.CompositionsIn(in, node, fps, mode)
+		if err != nil {
+			module, bare := culprit(in, node, fps, mode, failed, err)
+			if module == "" {
+				return nil, nil, nil, err
+			}
+			hold(module, err.Error(), bare)
+			continue
+		}
+		again := false
+		if applied && len(stood) > 0 {
+			placed := map[string]bool{}
+			for _, m := range assignedOn(in, node) {
+				placed[m] = true
+			}
+			of := map[string][]string{}
+			var nodes []string
+			for _, x := range stood {
+				if n, m := standsInFor(x, node); n == node && placed[m] {
+					of[m] = append(of[m], x)
+				} else {
+					nodes = append(nodes, x)
+				}
+			}
+			for _, m := range sortedKeys(of) {
+				if _, done := failed[m]; !done {
+					hold(m, "stands in for "+strings.Join(of[m], ", "), false)
+					again = true
+				}
+			}
+			if !again && len(nodes) > 0 {
+				return nil, nil, nil, fmt.Errorf("%w on %s: %s", compose.ErrStoodIn, node, strings.Join(nodes, ", "))
+			}
+		}
+		if !again && len(failed) > 0 {
+			dependent, own := dependsOnHeld(in, node, fps, mode, out, src, bareOf, failed)
+			if own {
+				return nil, nil, nil, fmt.Errorf("frombus: %s's own composition depends on how %s, held, is composed, and is not applied",
+					node, strings.Join(sortedKeys(failed), ", "))
+			}
+			for _, m := range dependent {
+				hold(m, "what it composes of "+strings.Join(sortedKeys(failed), ", ")+", held, is not what runs of them", false)
+				again = true
+			}
+		}
+		if !again {
+			break
+		}
+	}
+	skipped = slices.DeleteFunc(skipped, func(m string) bool { _, held := failed[m]; return held })
+	return out, skipped, stood, nil
+}
+
+// dependsOnHeld composes in again with each held module as its stub rather than as what runs of it, and answers the
+// modules, not held, whose composition differs between the two (sorted), and own when the node's own composition does
+// but for the held modules' own resources. A composition of stubs that fails says nothing more: what runs composed.
+func dependsOnHeld(in compose.Input, node string, fps map[string]string, mode compose.Mode, asRuns map[string]delivery.Composed,
+	src map[string]catalogue.Manifest, bareOf map[string]bool, failed map[string]string) (dependent []string, own bool) {
+	stubs := in
+	for _, m := range sortedKeys(failed) {
+		if man, ok := src[m]; ok {
+			stubs = heldAs(stubs, node, m, man, bareOf[m], nil)
+		}
+	}
+	asStubs, _, _, err := compose.CompositionsIn(stubs, node, fps, mode)
+	if err != nil {
+		return nil, false
+	}
+	isHeld := func(m string) bool { _, ok := failed[m]; return ok }
+	keys := map[string]bool{}
+	for k := range asRuns {
+		keys[k] = true
+	}
+	for k := range asStubs {
+		keys[k] = true
+	}
+	for _, k := range sortedKeys(keys) {
+		a, inA := asRuns[k]
+		b, inB := asStubs[k]
+		m := a.Module
+		if !inA {
+			m = b.Module
+		}
+		if m != "" && isHeld(m) {
+			continue
+		}
+		if m == "" {
+			a, b = withoutHeld(a, isHeld), withoutHeld(b, isHeld)
+		}
+		da, errA := delivery.ComposedDigestOf(a)
+		db, errB := delivery.ComposedDigestOf(b)
+		if inA == inB && errA == nil && errB == nil && da == db {
+			continue
+		}
+		if m == "" {
+			own = true
+			continue
+		}
+		dependent = append(dependent, m)
+	}
+	return dependent, own
+}
+
+// withoutHeld is the node's own composition c without the resources of a held module (its id naming it) and without
+// its filled paths, for comparing the rest.
+func withoutHeld(c delivery.Composed, isHeld func(string) bool) delivery.Composed {
+	out := c
+	out.Filled = nil
+	out.Resources = nil
+	for _, raw := range c.Resources {
+		var head struct {
+			ID     string `json:"id"`
+			Module string `json:"module"`
+		}
+		_ = json.Unmarshal(raw, &head)
+		owner := head.Module
+		if owner == "" {
+			owner, _ = declaration.ModuleGuess(head.ID)
+		}
+		if owner != "" && isHeld(owner) {
+			continue
+		}
+		out.Resources = append(out.Resources, raw)
+	}
+	return out
+}
+
+// dependents is, of the modules placed on node and not held, those that read what man says to them: each that provides
+// what man contributes to (the proxy its routes), and, when man listens on a port, each that holds the filter (the
+// openings).
+func dependents(in compose.Input, node string, man catalogue.Manifest, failed map[string]string) []string {
+	to := map[string]bool{}
+	for p := range man.Contributes {
+		to[p] = true
+	}
+	for p := range man.ContributesMany {
+		to[p] = true
+	}
+	listens := len(man.Listens) > 0
+	if len(to) == 0 && !listens {
+		return nil
+	}
+	var out []string
+	for _, m := range assignedOn(in, node) {
+		if _, held := failed[m]; held || m == man.Module {
+			continue
+		}
+		pm, ok := manifestOn(in, node, m)
+		if !ok {
+			continue
+		}
+		if listens && pm.Filtering != nil {
+			out = append(out, m)
+			continue
+		}
+		for _, o := range pm.Provides {
+			if to[o.Name] {
+				out = append(out, m)
+				break
+			}
+		}
+	}
+	return out
+}
+
+// assignedOn is the modules placed on node, in placement order.
+func assignedOn(in compose.Input, node string) []string {
+	for _, n := range in.Nodes {
+		if n.Name == node {
+			return n.Assigned
+		}
+	}
+	return nil
+}
+
+// manifestOn is the manifest node composes module from: its Kept, else the catalogue's.
+func manifestOn(in compose.Input, node, module string) (catalogue.Manifest, bool) {
+	for _, n := range in.Nodes {
+		if n.Name == node {
+			if man, ok := n.Kept[module]; ok {
+				return man, true
+			}
+		}
+	}
+	man, ok := in.Catalogue[module]
+	return man, ok
+}
+
+// culprit is the module placed on node whose composition the error is of: the first, in placement order, whose stub
+// (compose.Stub) makes the composition in mode succeed or fail otherwise; empty when none does (the error is not one
+// module's). Modules already refused are passed over. A module whose stub still fails the same is tried bare (its stub
+// contributing nothing, bare true): a refusal of what it contributes is its own, which the stub keeps (issue 1126,
+// seed-8: de-spiegel's route names on novox, an unset required value, refused the whole node).
+func culprit(in compose.Input, node string, fps map[string]string, mode compose.Mode, failed map[string]string, err error) (string, bool) {
+	var assigned []string
+	for _, n := range in.Nodes {
+		if n.Name == node {
+			assigned = n.Assigned
+		}
+	}
+	// Only the modules the error names: the words of a module's refusal name it. Each try is a whole composition, so a
+	// refusal naming none is no module's, answered at once rather than after a composition per module (issue 1126: ace's
+	// answer took 7m46s).
+	var order []string
+	for _, m := range assigned {
+		if strings.Contains(err.Error(), m) && len(order) < maxCulprits {
+			order = append(order, m)
+		}
+	}
+	changes := func(m string, bare bool) bool {
+		_, _, _, again := compose.CompositionsIn(stubbed(in, node, m, bare), node, fps, mode)
+		return again == nil || again.Error() != err.Error()
+	}
+	for _, m := range order {
+		if _, done := failed[m]; done {
+			continue
+		}
+		if changes(m, false) {
+			return m, false
+		}
+	}
+	var kept map[string]catalogue.Manifest
+	for _, n := range in.Nodes {
+		if n.Name == node {
+			kept = n.Kept
+		}
+	}
+	for _, m := range order {
+		// One already held is tried bare too, once: held for its build, its stub may still refuse (its own secret
+		// never issued, issue 1126).
+		if _, done := failed[m]; done && isBare(kept[m]) {
+			continue
+		}
+		if changes(m, true) {
+			return m, true
+		}
+	}
+	return "", false
+}
+
+// isBare says a stub contributes nothing and declares no own secret (stubbed, bare).
+func isBare(m catalogue.Manifest) bool {
+	return len(m.Contributes) == 0 && len(m.ContributesMany) == 0 && len(m.OwnSecrets) == 0
+}
+
+// stubbed is in with module held on node as its stub alone (heldAs, nothing of it running), from the manifest node
+// composes it from: a culprit's try.
+func stubbed(in compose.Input, node, module string, bare bool) compose.Input {
+	man, ok := manifestOn(in, node, module)
+	if !ok {
+		return in
+	}
+	return heldAs(in, node, module, man, bare, nil)
+}
+
+// heldAs is in with module held on node (compose.Node.Held): composed from man as what runs of it (compose.Carried of
+// runs; its stub, compose.Stub, when runs is nil or holds nothing of it), as node's Kept; bare, contributing nothing to
+// what it requires and declaring no own secret: none of a held module's own composition is applied, so what it has not
+// been issued (restic's repository on a node it never ran on) is no refusal of the rest.
+func heldAs(in compose.Input, node, module string, man catalogue.Manifest, bare bool, runs *delivery.Composed) compose.Input {
+	out := in
+	out.Nodes = append([]compose.Node(nil), in.Nodes...)
+	for i := range out.Nodes {
+		if out.Nodes[i].Name != node {
+			continue
+		}
+		if bare {
+			man.Contributes, man.ContributesMany, man.OwnSecrets = nil, nil, nil
+		}
+		kept := make(map[string]catalogue.Manifest, len(out.Nodes[i].Kept)+1)
+		for k, v := range out.Nodes[i].Kept {
+			kept[k] = v
+		}
+		kept[module] = compose.Carried(man, module, runs)
+		out.Nodes[i].Kept = kept
+		held := make(map[string]bool, len(out.Nodes[i].Held)+1)
+		for k, v := range out.Nodes[i].Held {
+			held[k] = v
+		}
+		held[module] = true
+		out.Nodes[i].Held = held
+	}
+	return out
+}

go/compose/frombus/answer_rows_test.go

@@ -0,0 +1,491 @@
+package frombus
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"reflect"
+	"slices"
+	"strings"
+	"testing"
+
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/overlay"
+)
+
+// Issue 1126 (the seed's shadow, round 2): a node's answer names every module it cannot compose, not the first only;
+// and a module folded into its own composition that names a build of the old form (de-spiegel on novox, nats, photos,
+// systemd-resolved: their haves name a build-... id and no fingerprint) is left to the node, carried as it runs.
+func answerNamesEveryRefusalAndLeavesAnOldBuildToTheNode(t *testing.T) {
+	ctx := context.Background()
+	image := "alpine@sha256:" + strings.Repeat("a", 64)
+	manifest := func(module string) []byte {
+		// Its data names its directory, as nats's names ${dir:mesh-state} (issue 1126: novox's own composition refused
+		// "nats says ${dir:mesh-state}, and nats declares no directory mesh-state" when its stub held no directory).
+		return []byte(`{"module":"` + module + `","version":"1","capabilities":["container-runtime"],` +
+			`"own-secrets":{"token":"${dir:state}/token"},` +
+			`"resources":[{"id":"state","type":"directory","path":"/var/lib/` + module + `","mode":"0700"},` +
+			`{"id":"server","type":"container","name":"` + module + `","artifact":"site"}],` +
+			`"build":{"artifacts":[{"name":"site","kind":"upstream","from":"` + image + `"}]}}`)
+	}
+	lemurs := []byte(`{"module":"lemurs","version":"1","resources":[{"id":"service","type":"service","unit":"lemurs.service","state":"running","boot":"enabled"}]}`)
+	fp := func(c string) string { return "src2:" + strings.Repeat(c, 64) }
+	mk := func(placed ...string) *bus {
+		p := delivery.Placement{Node: "n1", Decided: delivery.NodeDecided{Hub: true, Address: "10.77.0.1"}}
+		for _, m := range placed {
+			p.Modules = append(p.Modules, delivery.PlacedModule{Module: m})
+		}
+		b := &bus{placements: map[string]delivery.Placement{"n1": p},
+			records:   map[string]delivery.NodeRecord{"n1": {Node: "n1", TunnelKey: publicKey(t), SealingKey: "sk", Capabilities: []string{"systemd", "container-runtime"}}},
+			modules:   map[string]delivery.Module{"lemurs": {Manifest: delivery.ManifestDigest(lemurs)}},
+			manifests: map[string][]byte{delivery.ManifestDigest(lemurs): lemurs},
+			builds:    map[string]*delivery.BuilderBuild{}}
+		for _, m := range []string{"web", "api", "spiegel"} {
+			b.own = append(b.own, compose.OwnSecretRow{Node: "n1", Module: m, Name: "token", Origin: "made", SealedTo: "sk", Sealed: `"box"`})
+		}
+		for _, m := range []string{"web", "api", "spiegel"} {
+			raw := manifest(m)
+			b.manifests[delivery.ManifestDigest(raw)] = raw
+			b.modules[m] = delivery.Module{Manifest: delivery.ManifestDigest(raw)}
+		}
+		// web and api are built, their keys done and waiting for the reference of their image; spiegel has no build of
+		// the new form at all.
+		for i, m := range []string{"web", "api"} {
+			mod := b.modules[m]
+			mod.FP2 = fp(string(rune('1' + i)))
+			b.modules[m] = mod
+			b.builds[m+" "+mod.FP2] = &delivery.BuilderBuild{State: delivery.BuildDone, Manifest: mod.Manifest,
+				Artifacts: []delivery.BuiltArtifact{{Name: "site", Kind: "image", Digest: "sha256:" + strings.Repeat("b", 64)}}}
+		}
+		return b
+	}
+	given := func(b *bus) map[string]*delivery.Placement {
+		p := b.placements["n1"]
+		return map[string]*delivery.Placement{"n1": &p}
+	}
+
+	// Every refusal: two builds taken in, and a module the composition refuses (its image never built), each named.
+	b := mk("lemurs", "web", "api", "spiegel")
+	a := Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given(b)},
+		map[string]string{"lemurs": fp("e"), "web": fp("1"), "api": fp("2"), "spiegel": fp("3")}, nil, "p-h1", 3)
+	var refused []string
+	for _, r := range a.Refusals {
+		refused = append(refused, r.Module)
+	}
+	if a.Verdict != delivery.CandidateRefused || a.Refused != "" || !reflect.DeepEqual(refused, []string{"api", "spiegel", "web"}) {
+		t.Errorf("every refusal: %+v, want api, spiegel and web refused, each named", a)
+	}
+	for _, r := range a.Refusals {
+		want := map[string]string{"api": "waits for the reference of site", "web": "waits for the reference of site",
+			"spiegel": "spiegel has not been built for this mesh"}[r.Module]
+		if !strings.Contains(r.Why, want) {
+			t.Errorf("%s refused as %q, want %q", r.Module, r.Why, want)
+		}
+	}
+	if raw, err := delivery.EncodeHaveNode(delivery.HaveNode{Candidates: map[string]delivery.CandidateAnswer{"g": a}}); err != nil {
+		t.Errorf("the answer is not one a have holds: %v (%s)", err, raw)
+	}
+	if lemursOK := slices.ContainsFunc(a.Added, func(m delivery.ModuleAdded) bool { return m.Module == "lemurs" }); !lemursOK {
+		t.Errorf("lemurs, which composes, is not answered beside the refusals: %+v", a)
+	}
+
+	// The fold: spiegel runs inside the node's own composition at a build of the old form. Its resources are carried as
+	// they run, each after the one it runs after: the node's own is the one it runs, and the node composes itself.
+	b = mk("lemurs", overlay.Name, "spiegel")
+	p := b.placements["n1"]
+	p.Decided.Endpoint = "n1.example:51820"
+	b.placements["n1"] = p
+	fps := map[string]string{"lemurs": fp("e")}
+	stub := Scope{Node: "n1"}
+	in, err := Input(ctx, b, Mesh{}, stub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	in.Nodes[0].Kept = map[string]catalogue.Manifest{"spiegel": compose.Stub(in.Catalogue["spiegel"])}
+	base, _, err := compose.Compositions(in, "n1", fps, compose.Reading)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// A refusal naming no module placed here is no module's: no compose is spent stubbing each in turn (issue 1126: ace's
+	// answer took 7m46s, one compose per module), though here a stub would compose.
+	if m, _ := culprit(in, "n1", fps, compose.Foreseeing, map[string]string{}, fmt.Errorf("nothing in this mesh provides \"artifact-store\"")); m != "" {
+		t.Errorf("a refusal naming no placed module was laid on %s", m)
+	}
+	ownKey, _ := delivery.ComposedNodeKey("n1")
+	own := base[ownKey]
+	carriedRes := []json.RawMessage{
+		json.RawMessage(`{"id":"spiegel.state","type":"directory","path":"/var/lib/spiegel","mode":"0700"}`),
+		json.RawMessage(`{"id":"spiegel.server","type":"container","name":"spiegel","image":"registry.example/spiegel@sha256:` + strings.Repeat("c", 64) + `"}`)}
+	// They run after the node's first own resource.
+	own.Resources = append(append(append([]json.RawMessage{}, own.Resources[:1]...), carriedRes...), own.Resources[1:]...)
+	var running []delivery.Composed
+	for k, c := range base {
+		if k == ownKey {
+			c = own
+		}
+		running = append(running, c)
+	}
+	scope := Scope{Node: "n1", InOwn: []string{"spiegel"}, Running: running}
+	got, _, held, err := Compose(ctx, b, Mesh{}, scope, fps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatalf("the node does not compose itself with spiegel folded at a build of the old form: %v", err)
+	}
+	gotOwn, _ := json.Marshal(got[ownKey].Resources)
+	wantOwn, _ := json.Marshal(own.Resources)
+	if string(gotOwn) != string(wantOwn) {
+		t.Errorf("the node's own composition is\n%s\nwant what runs\n%s", gotOwn, wantOwn)
+	}
+	a = Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given(b), InOwn: []string{"spiegel"}}, fps, running, "p-h1", 3)
+	if a.Verdict != delivery.CandidateSame {
+		t.Errorf("the fold's answer: %+v, want the same", a)
+	}
+	// (A) The agent also says spiegel runs by module, from the declaration kept before the switch (agent.Everything): a
+	// module the composition folds is judged inside the node's own, not as removed (issue 1126, seed #531's answer).
+	keptToo := append(append([]delivery.Composed{}, running...), delivery.Composed{Node: "n1", Module: "spiegel", Resources: carriedRes})
+	if a = Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given(b), InOwn: []string{"spiegel"}}, fps, keptToo, "p-h1", 3); a.Verdict != delivery.CandidateSame || len(a.Removed) != 0 {
+		t.Errorf("a folded module running from the kept declaration is answered %+v, want the same", a)
+	}
+	// (B) The node's own composition carries its bus membership as it runs it (the controller's, from its store): composed
+	// the same, not 'in what runs, not composed' (seed #531, novox).
+	membership := json.RawMessage(`{"id":"bus-membership","type":"file","path":"` + catalogue.BusMembershipPath + `","sealed":"{\"box\":\"m\"}","mode":"0600"}`)
+	withMembership := make([]delivery.Composed, 0, len(running))
+	for _, c := range running {
+		if c.Module == "" {
+			c.Resources = append(append([]json.RawMessage{}, c.Resources...), membership)
+		}
+		withMembership = append(withMembership, c)
+	}
+	if a = Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given(b), InOwn: []string{"spiegel"}}, fps, withMembership, "p-h1", 3); a.Verdict != delivery.CandidateSame {
+		t.Errorf("the node's own with its bus membership is answered %+v, want the same", a)
+	}
+	// Without what runs, the fold composes spiegel from its manifest, as before, and the composition refuses it.
+	if _, _, held, err := Compose(ctx, b, Mesh{}, Scope{Node: "n1", InOwn: []string{"spiegel"}}, fps); err != nil ||
+		!strings.Contains(held["spiegel"], "spiegel has not been built for this mesh") {
+		t.Errorf("composed spiegel without what runs: %v %v, want spiegel held alone", err, held)
+	}
+
+	// (C) Issue 1126, C5: what the others read of a module carried as it runs is what runs, never its stub's: the filter
+	// opens the machine port its running container publishes (de-spiegel's 20005 on novox, not its software's 8080; a
+	// stub had no container, so snake's 80 on ace was opened beside the route proxy's). And C6: the operator export's file
+	// a module that keeps it runs is carried as it runs (mesh-vault.kept on novox), since the node holds no export.
+	listening := []byte(`{"module":"spiegel","version":"1","capabilities":["container-runtime"],` +
+		`"listens":[{"port":8080,"from":"mesh","why":"the site"}],"own-secrets":{"token":"${dir:state}/token"},` +
+		`"resources":[{"id":"state","type":"directory","path":"/var/lib/spiegel","mode":"0700"},` +
+		`{"id":"server","type":"container","name":"spiegel","artifact":"site","ports":["8080"]}],` +
+		`"build":{"artifacts":[{"name":"site","kind":"upstream","from":"` + image + `"}]}}`)
+	nft := []byte(`{"module":"nft","version":"1","capabilities":["systemd"],"filtering":{"into":"/etc/nftables.conf"}}`)
+	vault := []byte(`{"module":"vault","version":"1","capabilities":["systemd"],"keeps":"/var/lib/vault/root",` +
+		`"resources":[{"id":"service","type":"service","unit":"vault.service","state":"running","boot":"enabled"}]}`)
+	b = mk("lemurs", overlay.Name, "spiegel", "nft", "vault")
+	for m, raw := range map[string][]byte{"spiegel": listening, "nft": nft, "vault": vault} {
+		b.manifests[delivery.ManifestDigest(raw)] = raw
+		b.modules[m] = delivery.Module{Manifest: delivery.ManifestDigest(raw)}
+	}
+	p = b.placements["n1"]
+	p.Decided.Endpoint = "n1.example:51820"
+	for i := range p.Modules {
+		if p.Modules[i].Module == "spiegel" {
+			p.Modules[i].Ports = map[string]int{"8080": 20005}
+		}
+	}
+	b.placements["n1"] = p
+	rec := b.records["n1"]
+	rec.OutwardLinks = []string{"eth0"}
+	b.records["n1"] = rec
+	fps = map[string]string{"lemurs": fp("e"), "nft": fp("f"), "vault": fp("9")}
+	if in, err = Input(ctx, b, Mesh{}, stub); err != nil {
+		t.Fatal(err)
+	}
+	in.Nodes[0].Kept = map[string]catalogue.Manifest{"spiegel": compose.Stub(in.Catalogue["spiegel"])}
+	if base, _, err = compose.Compositions(in, "n1", fps, compose.Reading); err != nil {
+		t.Fatal(err)
+	}
+	keptFile := json.RawMessage(`{"digest":"sha256:` + strings.Repeat("d", 64) + `","id":"vault.kept","mode":"0600","module":"vault","path":"/var/lib/vault/root/export.json","size":143604,"type":"file"}`)
+	running = nil
+	for _, c := range base {
+		switch c.Module {
+		case "":
+			c.Resources = append(append([]json.RawMessage{}, c.Resources...),
+				json.RawMessage(`{"id":"spiegel.state","type":"directory","path":"/var/lib/spiegel","mode":"0700"}`),
+				json.RawMessage(`{"id":"spiegel.server","type":"container","name":"spiegel","image":"registry.example/spiegel@sha256:`+strings.Repeat("c", 64)+`","ports":["10.77.0.1:20005:8080"]}`),
+				json.RawMessage(`{"id":"spiegel.server-env","type":"file","path":"/var/lib/spiegel/server.env","mode":"0600","content":"A=1\n"}`))
+		case "vault":
+			c.Resources = append(append([]json.RawMessage{}, c.Resources...), keptFile)
+		}
+		running = append(running, c)
+	}
+	got, _, held, err = Compose(ctx, b, Mesh{}, Scope{Node: "n1", InOwn: []string{"spiegel"}, Running: running}, fps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatalf("the node does not compose itself with spiegel carried: %v", err)
+	}
+	var rules string
+	var keptComposed json.RawMessage
+	for _, c := range got {
+		for _, raw := range c.Resources {
+			var r struct {
+				ID      string `json:"id"`
+				Content string `json:"content"`
+			}
+			_ = json.Unmarshal(raw, &r)
+			switch r.ID {
+			case "nft." + catalogue.FilteringID():
+				rules = r.Content
+			case "vault." + catalogue.KeptID():
+				keptComposed = raw
+			}
+		}
+	}
+	if !strings.Contains(rules, "# spiegel — the site") || !strings.Contains(rules, "dport 20005 accept") || strings.Contains(rules, "dport 8080") {
+		t.Errorf("the filter does not open the machine port spiegel runs at:\n%s", rules)
+	}
+	// The paths a carried module owns are its manifest's, as the controller composes them, never what runs of it (issue
+	// 1126, seed-8 #542: on ace, the folded f1-circuits, snake and txt-game, whose manifests leave their directories and
+	// files to ${dir:…}, owned their /var/lib paths on the node and none on the controller, shifting node-tools'
+	// MESH_OWNED_PATHS). f1-circuits' manifest at the indexer's commit (c0ea2c94) is captured; what runs of it is
+	// composed from that manifest by the controller's rule (the directory at /var/lib/f1-circuits, its file, its container).
+	for _, c := range running {
+		if c.Module == "" && !reflect.DeepEqual(compose.Carried(in.Catalogue["spiegel"], "spiegel", &c).OwnsPaths, []string{"/var/lib/spiegel"}) {
+			t.Errorf("spiegel carried owns %v, want its manifest's /var/lib/spiegel alone", compose.Carried(in.Catalogue["spiegel"], "spiegel", &c).OwnsPaths)
+		}
+	}
+	f1raw, err := os.ReadFile("testdata/f1-circuits-c0ea2c94.module.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	f1, err := catalogue.ParseManifest(f1raw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	f1runs := delivery.Composed{Node: "ace", Resources: []json.RawMessage{
+		json.RawMessage(`{"id":"f1-circuits.state","module":"f1-circuits","type":"directory","path":"/var/lib/f1-circuits","mode":"0700"}`),
+		json.RawMessage(`{"id":"f1-circuits.cache","module":"f1-circuits","type":"directory","path":"/var/lib/f1-circuits/cache","mode":"0700"}`),
+		json.RawMessage(`{"id":"f1-circuits.site-env","module":"f1-circuits","type":"file","path":"/var/lib/f1-circuits/site.env","mode":"0644","content":"F1_CIRCUITS_BASE_URL=https://f1.example\n"}`),
+		json.RawMessage(`{"id":"f1-circuits.server","module":"f1-circuits","type":"container","name":"f1-circuits","image":"registry.example/f1@sha256:` + strings.Repeat("c", 64) + `"}`)}}
+	if got, want := catalogue.DeclaredPaths(compose.Carried(f1, "f1-circuits", &f1runs)), catalogue.DeclaredPaths(f1); !reflect.DeepEqual(got, want) {
+		t.Errorf("f1-circuits carried owns %v, want what the controller composes from its manifest, %v", got, want)
+	}
+	var k1, k2 any
+	_ = json.Unmarshal(keptComposed, &k1)
+	_ = json.Unmarshal(keptFile, &k2)
+	if !reflect.DeepEqual(k1, k2) {
+		t.Errorf("the operator export is composed as %s, want the file that runs %s", keptComposed, keptFile)
+	}
+
+	// (D) Issue 1126, seed-8 (mesh-catalog #542): a module's own refusal refuses that module, never the node. novox runs
+	// de-spiegel folded, and its manifest at the indexer's commit (e25e1beb, captured) asks four required config values
+	// for its route names that nothing sets. novox answered the whole candidate refused ("de-spiegel contributing
+	// praktijk to route says ${setting:praktijk-name} ...": its stub still contributed the route). Only de-spiegel is
+	// refused, in the config form's words, and proxy, which receives its routes (what it would compose lacks them: review
+	// of the apply, round 1); the rest is judged.
+	spiegel, err := os.ReadFile("testdata/de-spiegel-e25e1beb.module.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	proxy := []byte(`{"module":"proxy","version":"1","capabilities":["systemd"],"provides":[{"name":"route","scope":"mesh"},{"name":"smtp","scope":"mesh"}],` +
+		`"resources":[{"id":"service","type":"service","unit":"proxy.service","state":"running","boot":"enabled"}]}`)
+	b = mk("lemurs", overlay.Name, "proxy", "de-spiegel")
+	for m, raw := range map[string][]byte{"de-spiegel": spiegel, "proxy": proxy} {
+		b.manifests[delivery.ManifestDigest(raw)] = raw
+		b.modules[m] = delivery.Module{Manifest: delivery.ManifestDigest(raw)}
+	}
+	p = b.placements["n1"]
+	p.Decided.Endpoint = "n1.example:51820"
+	b.placements["n1"] = p
+	fps = map[string]string{"lemurs": fp("e"), "proxy": fp("f")}
+	a = Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given(b), InOwn: []string{"de-spiegel"}}, fps, nil, "p-h1", 3)
+	refused = nil
+	for _, r := range a.Refusals {
+		refused = append(refused, r.Module)
+		if r.Module == "de-spiegel" && (!strings.Contains(r.Why, "${config:praktijk-name}") || strings.Contains(r.Why, "${setting:")) {
+			t.Errorf("de-spiegel is refused in other words than its config form's: %s", r.Why)
+		}
+	}
+	if a.Refused != "" || !reflect.DeepEqual(refused, []string{"de-spiegel", "proxy"}) {
+		t.Errorf("a module's own refusal: %+v, want de-spiegel refused with proxy, which receives its routes, the node not", a)
+	}
+	if !slices.ContainsFunc(a.Added, func(m delivery.ModuleAdded) bool { return m.Module == "lemurs" }) {
+		t.Errorf("lemurs, which composes, is not judged beside de-spiegel's refusal: %+v", a)
+	}
+
+	// (E) Issue 1126, the applying path (review of the seed): the composition novox applies follows the same rule. It
+	// composed with no culprit, so de-spiegel's unset route names refused the whole node and every module it runs was
+	// marked not composed. Now de-spiegel is held, its refusal said in its config form's words, with proxy, which
+	// receives its routes; lemurs composes, and the node's own composition carries de-spiegel as it runs, so applying it
+	// removes nothing of it.
+	spiegelRuns := []json.RawMessage{
+		json.RawMessage(`{"id":"de-spiegel.state","type":"directory","path":"/var/lib/de-spiegel","mode":"0755"}`),
+		json.RawMessage(`{"id":"de-spiegel.server-env","type":"file","path":"/var/lib/de-spiegel/server.env","mode":"0600","content":"A=1\n"}`),
+		json.RawMessage(`{"id":"de-spiegel.server","type":"container","name":"de-spiegel","image":"registry.example/de-spiegel@sha256:` + strings.Repeat("c", 64) + `"}`)}
+	if in, err = Input(ctx, b, Mesh{}, stub); err != nil {
+		t.Fatal(err)
+	}
+	in.Nodes[0].Kept = map[string]catalogue.Manifest{"de-spiegel": compose.Stub(in.Catalogue["de-spiegel"])}
+	in.Nodes[0].Kept["de-spiegel"] = func(m catalogue.Manifest) catalogue.Manifest {
+		m.Contributes, m.ContributesMany = nil, nil
+		return m
+	}(in.Nodes[0].Kept["de-spiegel"])
+	if base, _, err = compose.Compositions(in, "n1", fps, compose.Reading); err != nil {
+		t.Fatal(err)
+	}
+	running = nil
+	for _, c := range base {
+		if c.Module == "" {
+			c.Resources = append(append([]json.RawMessage{}, c.Resources...), spiegelRuns...)
+		}
+		running = append(running, c)
+	}
+	got, _, held, err = Compose(ctx, b, Mesh{}, Scope{Node: "n1", InOwn: []string{"de-spiegel"}, Running: running}, fps)
+	if err != nil {
+		t.Fatalf("de-spiegel's own refusal refuses the node's whole composition: %v", err)
+	}
+	if len(held) != 2 || !strings.Contains(held["de-spiegel"], "${config:praktijk-name}") || !strings.Contains(held["proxy"], "de-spiegel") {
+		t.Errorf("held %v, want de-spiegel in its config form's words, and proxy for its routes", held)
+	}
+	lemursKey, _ := delivery.ComposedKey("n1", "lemurs", fps["lemurs"])
+	proxyKey, _ := delivery.ComposedKey("n1", "proxy", fps["proxy"])
+	if _, ok := got[lemursKey]; !ok {
+		t.Errorf("lemurs, which composes, is not composed beside de-spiegel's refusal: %v", sortedKeys(got))
+	}
+	if _, ok := got[proxyKey]; ok {
+		t.Errorf("proxy is composed without the routes of held de-spiegel: %v", sortedKeys(got))
+	}
+	carries := func(c delivery.Composed, what string) {
+		t.Helper()
+		ownRes, _ := json.Marshal(c.Resources)
+		for _, raw := range spiegelRuns {
+			var r struct{ ID string }
+			_ = json.Unmarshal(raw, &r)
+			if !strings.Contains(string(ownRes), `"id":"`+r.ID+`"`) {
+				t.Errorf("%s: the node's own composition drops %s, which de-spiegel runs: %s", what, r.ID, ownRes)
+			}
+		}
+	}
+	carries(got[ownKey], "folded")
+	// (F) Leaving the fold (review of the apply, round 1, finding 1): de-spiegel's want names a build of the new form,
+	// so it is no longer folded, while its names are still unset and the node's own still runs it. Held, it is carried
+	// in the node's own as it runs until a composition of its own is handed: else the node's own apply removes its
+	// container, files and units (issue 1945 by a new path).
+	fps["de-spiegel"] = fp("7")
+	got, _, held, err = Compose(ctx, b, Mesh{}, Scope{Node: "n1", Running: running}, fps)
+	if err != nil || !strings.Contains(held["de-spiegel"], "${config:praktijk-name}") {
+		t.Fatalf("de-spiegel leaving the fold: %v, held %v", err, held)
+	}
+	spiegelKey, _ := delivery.ComposedKey("n1", "de-spiegel", fps["de-spiegel"])
+	if _, ok := got[spiegelKey]; ok {
+		t.Errorf("held de-spiegel's own composition is handed")
+	}
+	carries(got[ownKey], "leaving the fold")
+
+	// (G) A held module that runs a composition of its own (review of the apply, round 1, finding 2): what the others
+	// compose of it is what runs, never its stub's. site listens on 8080, placed at the machine's 20005, and its own
+	// secret was never issued here: held, the filter must not open 8080 and drop the 20005 that runs. A module whose
+	// composition depends on how site is held (here the filter) is held with it.
+	site := []byte(`{"module":"site","version":"1","capabilities":["container-runtime"],` +
+		`"listens":[{"port":8080,"from":"mesh","why":"the site"}],"own-secrets":{"key":"${dir:state}/key"},` +
+		`"resources":[{"id":"state","type":"directory","path":"/var/lib/site","mode":"0700"},` +
+		`{"id":"server","type":"container","name":"site","image":"registry.example/site@sha256:` + strings.Repeat("c", 64) + `","ports":["8080"]}]}`)
+	b = mk("lemurs", overlay.Name, "site", "nft")
+	for m, raw := range map[string][]byte{"site": site, "nft": nft} {
+		b.manifests[delivery.ManifestDigest(raw)] = raw
+		b.modules[m] = delivery.Module{Manifest: delivery.ManifestDigest(raw)}
+	}
+	p = b.placements["n1"]
+	p.Decided.Endpoint = "n1.example:51820"
+	for i := range p.Modules {
+		if p.Modules[i].Module == "site" {
+			p.Modules[i].Ports = map[string]int{"8080": 20005}
+		}
+	}
+	b.placements["n1"] = p
+	rec = b.records["n1"]
+	rec.OutwardLinks = []string{"eth0"}
+	b.records["n1"] = rec
+	fps = map[string]string{"lemurs": fp("e"), "nft": fp("f"), "site": fp("8")}
+	siteRuns := delivery.Composed{Node: "n1", Module: "site", FP: fps["site"], Resources: []json.RawMessage{
+		json.RawMessage(`{"id":"site.state","module":"site","type":"directory","path":"/var/lib/site","mode":"0700"}`),
+		json.RawMessage(`{"id":"site.server","module":"site","type":"container","name":"site","image":"registry.example/site@sha256:` + strings.Repeat("c", 64) + `","ports":["10.77.0.1:20005:8080"]}`)}}
+	got, _, held, err = Compose(ctx, b, Mesh{}, Scope{Node: "n1", Running: []delivery.Composed{siteRuns}}, fps)
+	if err != nil || held["site"] == "" || held["nft"] == "" {
+		t.Fatalf("site, its own secret never issued: %v, held %v; want site held, and the filter, which depends on it", err, held)
+	}
+	for key, c := range got {
+		for _, raw := range c.Resources {
+			if strings.Contains(string(raw), "dport 8080") || (c.Module == "nft" && !strings.Contains(string(raw), "dport 20005") && strings.Contains(string(raw), "# site")) {
+				t.Errorf("%s composes held site from its stub, not from what runs: %s", key, raw)
+			}
+		}
+	}
+	// (H) Review of the apply, round 2: a held module is composed from its new manifest, so what the others read of its
+	// manifest (its listens, what it contributes) may not be what runs. site's new manifest moves it to 9090 while the
+	// build that runs listens on 8080: the filter, the holder of what site listens on, is held with it, and nothing
+	// applied opens 9090.
+	moved := []byte(strings.Replace(string(site), `"port":8080`, `"port":9090`, 1))
+	b.manifests[delivery.ManifestDigest(moved)] = moved
+	b.modules["site"] = delivery.Module{Manifest: delivery.ManifestDigest(moved)}
+	for i := range p.Modules {
+		p.Modules[i].Ports = nil
+	}
+	b.placements["n1"] = p
+	siteRuns.Resources[1] = json.RawMessage(`{"id":"site.server","module":"site","type":"container","name":"site","image":"registry.example/site@sha256:` + strings.Repeat("c", 64) + `","ports":["8080"]}`)
+	got, _, held, err = Compose(ctx, b, Mesh{}, Scope{Node: "n1", Running: []delivery.Composed{siteRuns}}, fps)
+	if err != nil || held["site"] == "" || held["nft"] == "" {
+		t.Errorf("site moved to 9090 in its new manifest: %v, held %v; want site held, and the filter with it", err, held)
+	}
+	for key, c := range got {
+		for _, raw := range c.Resources {
+			if strings.Contains(string(raw), "dport 9090") {
+				t.Errorf("%s opens 9090, which held site's new manifest names and nothing runs: %s", key, raw)
+			}
+		}
+	}
+}
+
+// A module another node cannot run in this composition offers nothing in it: the refusal names it and why
+// (issue 1126, probe #532: ace and g14 answered "nothing in this mesh provides artifact-store … assign distribution to a
+// node" while novox runs it). And a refusal no module's stub changes is answered at once, not after a compose per module
+// (ace took 7m46s).
+func otherNodeNotResolvedIsNamed(t *testing.T) {
+	ctx := context.Background()
+	prov := []byte(`{"module":"prov","version":"1","capabilities":["container-runtime"],"provides":[{"name":"thing","scope":"mesh"}]}`)
+	cons := []byte(`{"module":"cons","version":"1","requires":["thing"]}`)
+	// n2 runs prov, which needs a container runtime n2's record does not say it has: n2's set does not resolve here.
+	b := &bus{placements: map[string]delivery.Placement{
+		"n1": {Node: "n1", Decided: delivery.NodeDecided{Hub: true, Address: "10.77.0.1", Endpoint: "n1.example:51820"}, Modules: []delivery.PlacedModule{{Module: "cons"}, {Module: overlay.Name}}},
+		"n2": {Node: "n2", Decided: delivery.NodeDecided{Address: "10.77.0.2"}, Modules: []delivery.PlacedModule{{Module: "prov"}, {Module: overlay.Name}}}},
+		records:   map[string]delivery.NodeRecord{"n1": {Node: "n1", TunnelKey: publicKey(t)}, "n2": {Node: "n2", TunnelKey: publicKey(t)}},
+		modules:   map[string]delivery.Module{"prov": {Manifest: delivery.ManifestDigest(prov)}, "cons": {Manifest: delivery.ManifestDigest(cons)}},
+		manifests: map[string][]byte{delivery.ManifestDigest(prov): prov, delivery.ManifestDigest(cons): cons}}
+	given := map[string]*delivery.Placement{}
+	for n, p := range b.placements {
+		p := p
+		given[n] = &p
+	}
+	a := Answer(ctx, b, Mesh{}, Scope{Node: "n1", Placements: given}, map[string]string{"cons": "src2:" + strings.Repeat("1", 64)}, nil, "p-h1", 1)
+	if a.Verdict != delivery.CandidateRefused || !strings.Contains(a.Refused, "prov on n2 lacks container-runtime") {
+		t.Errorf("a refusal for want of n2's provider = %+v", a)
+	}
+}
+
+// A node that reaches no artifact store says what its composition holds of one (issue 1126: ace and g14 answered
+// "reaches no artifact store", and nothing said why).
+func noStoreReachedSaysWhy(t *testing.T) {
+	in := compose.Input{Catalogue: map[string]catalogue.Manifest{
+		"distribution": {Module: "distribution", Serves: map[string]map[string]any{catalogue.ArtifactStoreProvision: {"port": 5000}}}},
+		Nodes: []compose.Node{{Name: "g14", Assigned: []string{"adwaita"}}, {Name: "novox", Assigned: []string{"distribution"}}}}
+	if got := storeSought(in); got != "the composition holds g14, novox; artifact-store is served by distribution on novox, none of it on the private network with a port" {
+		t.Errorf("said %q", got)
+	}
+	in.Nodes = in.Nodes[:1]
+	if got := storeSought(in); got != "the composition holds g14; no module placed there serves artifact-store" {
+		t.Errorf("said %q", got)
+	}
+}

go/compose/frombus/export.go

@@ -10,9 +10,10 @@ import (
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
-// Export is one node's placement file as the composition input the controller fills says it (novox/hq ADR 0555 §6,
-// issue 1126): the inverse of Input for what a person decides, so the controller's one read-only verb
-// `placement-export` answers, from its own store by its own code, exactly what the seed writes into the catalogue.
+// Export is one node's placement as the composition input the controller fills says it (novox/hq ADR 0555 §6, ADR 0567
+// §7): the inverse of Input for what a person decides, so the controller's one read-only verb `placement-export`
+// answers, from its own store by its own code, exactly what the seat's adopt proposes as the seed. Its answer must stay
+// stable for the same store, since adopt checks its digest again at the warrant.
 // What the machine observes (its record) is not in it.
 func Export(in compose.Input, node string) (delivery.Placement, error) {
 	var n *compose.Node
@@ -24,8 +25,8 @@ func Export(in compose.Input, node string) (delivery.Placement, error) {
 	if n == nil {
 		return delivery.Placement{}, fmt.Errorf("frombus: the input has no node %q", node)
 	}
-	// At the version the placement file is read at, with a list of modules even when none is placed: the export is the
-	// file the seed writes (cmd/placement-seed), and the reader refuses a value of version 0 or without its modules.
+	// At the version a placement key is read at, with a list of modules even when none is placed: the export is the
+	// seed's value, and the reader refuses a value of version 0 or without its modules.
 	p := delivery.Placement{V: delivery.Version, Node: node, Modules: []delivery.PlacedModule{}, Decided: delivery.NodeDecided{
 		Endpoint: n.Place.Endpoint, Site: n.Place.Site, Hub: n.Place.Hub, Address: n.Place.Address,
 		PublicDomain: n.PublicDomain, Account: n.Account, AccountHome: n.AccountHome, AgentAccount: n.AgentAccount,

go/compose/frombus/frombus.go

@@ -2,28 +2,31 @@
 // and the grants part compose with one composer over the same inputs (novox/hq ADR 0547 §2, ADR 0549 §3; issue 1126).
 //
 // **One composer, three callers.** compose.Compositions is the composer; Input is how each caller fills its
-// compose.Input from the bus: the node agent for its own node (ADR 0547 §2), the assigner's composition check for every
-// node (ADR 0539 §6's check, ADR 0547 §4), and the grants part (ADR 0547 §5). Each reads the bus with its own credential
+// compose.Input from the bus: the node agent for its own node (ADR 0547 §2), the seat mesh-placement's holder judging a
+// proposal for every node (ADR 0567 §4), and the grants part (ADR 0547 §5). Each reads the bus with its own credential
 // through a Reader, so this package holds no bus client, no store and no timer: what it is given is all it reads.
 //
 // **What it reads, and from whom.**
 //   - which modules run on each node, with their pins, holdings, host ports, bindings and settings placement: the
-//     indexer's state `placement`, one key per node (ADR 0549 §2);
+//     seat mesh-placement's state `placement`, one key per node (ADR 0567 §1);
 //   - what a person decided of each node (its endpoint, site, hub, address on the private network, public domain and
 //     accounts): the same placement key, Placement.Decided;
 //   - what each node observes of itself (its tunnel key, capabilities, keys, certificate, links and networks): the
 //     node's own have key, `<node>.node` (HaveNode.Record); the tunnel found at a node's adoption and the names of the hub's peers are decided,
 //     in its placement, and whether the hub took the tunnel over and who enrolled under a peer's key are read from both;
-//   - every module's manifest: the indexer's `modules.<module>` and its manifests by digest, or the digest the
-//     composing node's want names where it runs another build (Scope.Kept);
+//   - every module's manifest: the indexer's `modules.<module>` and its manifests by digest; for each module placed on
+//     the composing node, its built manifest instead: the builder's done key at the trunk's FP2, or at the fingerprint
+//     the node's want names where it runs another build (Scope.KeptAt), resolved by the controller's own take-in rule
+//     (takein.Manifest), a moved module's templates archive read in the artifact store (issue 1126);
 //   - each module's config values on a node: mesh-config's resolved state, the composing node's slice alone unless the
-//     caller composes every node (ADR 0547 §2, the prepare step's L4).
+//     caller composes every node (ADR 0547 §2, the prepare step's L4); of another node, only the keys its modules'
+//     served values fill (catalogue.ServedSettings), which every consumer is told (issue 1126).
 //
 // **Own secrets and pair credentials** come from the vault sealed to the composing node's key (OwnSecrets, Credentials),
 // for that node alone: as a consumer and as a provider, exactly the keys compose.CredentialsNeeded names. **Not yet
 // read** (each a later subtask of issue 1126): licences (none is placed today) and core boxes. Without one
-// the composition stands in for it, and Compose refuses a composition that stands in for anything (compose.ErrStoodIn):
-// a node never applies a stand-in. No node is joining before ADR 0547's third milestone (ADR 0550 §6), so Joining is
+// the composition stands in for it, and Compose holds the module it stands in for (or refuses the node, for a stand-in
+// of no module placed there; compose.ErrStoodIn): a node never applies a stand-in. No node is joining before ADR 0547's third milestone (ADR 0550 §6), so Joining is
 // always empty.
 package frombus
 
@@ -32,13 +35,16 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/netip"
+	"slices"
 	"sort"
 	"strings"
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/declaration"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 	"git.novox.be/novox/mesh-sdk/go/overlay"
+	"git.novox.be/novox/mesh-sdk/go/takein"
 )
 
 // Reader is the bus as a caller reads it with its own credential. Each method reads one part's state; an error is a
@@ -63,6 +69,18 @@ type Reader interface {
 	// and each it grants as a provider, with the copy sealed to it (the vault's `own` with the keys, ADR 0550 §5). A key
 	// the vault holds no value for is left out; the composition then stands in for it, and Compose refuses it.
 	Credentials(ctx context.Context, node string, asConsumer, asProvider []compose.CredentialKey) ([]compose.Credential, []compose.Issued, error)
+	// Build is a module's build at a fingerprint, the builder's key (delivery.BuilderBuildsBucket, BuilderBuildKey); nil
+	// when the builder holds none. The composing node composes each of its modules from its build (issue 1126).
+	Build(ctx context.Context, module, fp string) (*delivery.BuilderBuild, error)
+	// Archive is the archive at url, a kept reference routed to the artifact store as the composing node reaches it
+	// (catalogue.Routed), checked against digest: a moved module's templates archive, read back for its texts as the
+	// controller's take-in reads it (takein.Built).
+	Archive(ctx context.Context, url, digest string) ([]byte, error)
+	// Served is, of one module's config values on another node than the composing one (mesh-config's state `resolved`,
+	// keys `<node>.<module>.<key>`), the keys named, decoded: the keys its served values and zone name fill
+	// (catalogue.ServedSettings), which every consumer is told and so every node may read (issue 1126). Nil when none
+	// is set.
+	Served(ctx context.Context, node, module string, keys []string) (map[string]any, error)
 }
 
 // Mesh is what is true of the whole mesh and is no part's state on the bus yet: the private network's range and the
@@ -78,20 +96,101 @@ type Mesh struct {
 }
 
 // Scope says who composes. Node is the node composing; only its config values are read unless Every is set, as the
-// composition check sets it to compose every node. Kept is, by module, the manifest digest the composing node's wants
-// name where it differs from the indexer's trunk: that node composes the module as it runs it.
+// composition check sets it to compose every node (of another node's modules, only the values their served values fill
+// are read, Reader.Served). KeptAt is, by module, the fingerprint the composing node's want names where it differs from
+// the indexer's trunk: that node composes the module from its build at that fingerprint, as it runs it.
+//
+// **Composed from its build** (issue 1126): each module placed on the composing node, and each in KeptAt, composes from
+// its built manifest (takein.Manifest over the builder's done key at the trunk's FP2 or the kept fingerprint), as the
+// controller composes from the manifest its take-in resolved: so a moved module is handed to the provisioner, a resource
+// naming an artifact names what was built, and a templated file has its text. A placed module the builder holds no done
+// build of at the trunk's FP2 composes from the indexer's manifest, as before. Every leaves the catalogue as the indexer
+// read it: the check of every node judges placement, and reads no archive.
+//
+// Placements, when set, stands in for the placement of the nodes it names: a proposal's candidates
+// (delivery.PlacementCandidate), so a node composes in shadow with a proposal laid over and compares the result with
+// what it runs (ADR 0567 §3); a nil value removes the node's placement. The rest is read as always.
+//
+// InOwn is the modules the composing node runs inside its own composition (InOwn of what it runs), composed there again
+// (compose.Node.InOwn) rather than cut out as modules no build is given for (issue 1126).
+//
+// Running is what the composing node runs; of it, its own composition (`<node>.node`) is given to the composition
+// (compose.Node.RunsOwn), so a module folded there that names a build of the old form is left to the node, carried
+// as it runs (issue 1126). Nil composes every folded module from its manifest.
 type Scope struct {
-	Node  string
-	Every bool
-	Kept  map[string]string
+	Node       string
+	Every      bool
+	KeptAt     map[string]string
+	Placements map[string]*delivery.Placement
+	InOwn      []string
+	Running    []delivery.Composed
+	// SameValue, in an answer, says whether two sealed values open to the same value (the node opens them with its own
+	// key), so a differing resource shows a value sealed again as such (delivery.CompareComposedWith). Nil shows them
+	// as differing.
+	SameValue func(a, b string) (same, known bool)
+}
+
+// InOwn is, of the modules p places on its node, those whose resources the node's own composition it runs
+// (`<node>.node` in running) carries, by the module their ids name (declaration.ModuleGuess), sorted: the modules the
+// controller's composed writer folded there because no fingerprint of the new form names them (mesh-wireguard, a module
+// run at a build of the old form; issue 1126). A node composing itself passes it as Scope.InOwn, so its own
+// composition keeps them as it runs them until a want names a build of the new form for one.
+func InOwn(running []delivery.Composed, p delivery.Placement) []string {
+	placed := map[string]bool{}
+	for _, m := range p.Modules {
+		placed[m.Module] = true
+	}
+	in := map[string]bool{}
+	for _, c := range running {
+		if c.Module != "" {
+			continue
+		}
+		for _, raw := range c.Resources {
+			var head struct {
+				ID     string `json:"id"`
+				Module string `json:"module"`
+			}
+			if json.Unmarshal(raw, &head) != nil || head.Module != "" {
+				continue
+			}
+			if m, ok := declaration.ModuleGuess(head.ID); ok && placed[m] {
+				in[m] = true
+			}
+		}
+	}
+	return sortedKeys(in)
 }
 
 // Input is the composition input for s, read through r.
 func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, error) {
+	return input(ctx, r, mesh, s, nil)
+}
+
+// input is Input; with refuse set, a module placed on the composing node whose build cannot be read or taken in is
+// handed to refuse and composed as a stub (compose.Stub, kept for that node alone) rather than ending the read, so a
+// node's answer names every module it cannot compose (issue 1126).
+func input(ctx context.Context, r Reader, mesh Mesh, s Scope, refuse func(module string, err error)) (compose.Input, error) {
 	placements, err := r.Placements(ctx)
 	if err != nil {
 		return compose.Input{}, fmt.Errorf("frombus: placement: %w", err)
 	}
+	if len(s.Placements) > 0 {
+		given := make(map[string]delivery.Placement, len(placements)+len(s.Placements))
+		for node, p := range placements {
+			given[node] = p
+		}
+		for node, p := range s.Placements {
+			if p == nil {
+				delete(given, node)
+				continue
+			}
+			if p.Node != node {
+				return compose.Input{}, fmt.Errorf("frombus: the placement given for %s names the node %q", node, p.Node)
+			}
+			given[node] = *p
+		}
+		placements = given
+	}
 	records, err := r.Records(ctx)
 	if err != nil {
 		return compose.Input{}, fmt.Errorf("frombus: node records: %w", err)
@@ -120,15 +219,18 @@ func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, er
 			}
 		}
 	}
+	parse := func(raw []byte) (catalogue.Manifest, error) {
+		if mesh.Predefined != nil {
+			return catalogue.ParseManifestWith(raw, mesh.Predefined)
+		}
+		return catalogue.ParseManifestForInputs(raw)
+	}
 	read := func(module, digest string) (catalogue.Manifest, error) {
 		raw, err := r.Manifest(ctx, digest)
 		if err != nil {
 			return catalogue.Manifest{}, fmt.Errorf("frombus: the manifest of %s (digest %s): %w", module, digest, err)
 		}
-		if mesh.Predefined != nil {
-			return catalogue.ParseManifestWith(raw, mesh.Predefined)
-		}
-		return catalogue.ParseManifestForInputs(raw)
+		return parse(raw)
 	}
 	for _, name := range sortedKeys(modules) {
 		m := modules[name]
@@ -172,6 +274,13 @@ func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, er
 				if values, err = r.Values(ctx, node, m.Module); err != nil {
 					return compose.Input{}, fmt.Errorf("frombus: %s's config values on %s: %w", m.Module, node, err)
 				}
+			} else if keys := catalogue.ServedSettings(in.Catalogue[m.Module]); len(keys) > 0 {
+				// What a provider elsewhere serves from its settings is told to every consumer: the composing node reads
+				// those keys of it, and no other (issue 1126: mailu's smtp domain, a consumer's on shanks).
+				if values, err = r.Served(ctx, node, m.Module, keys); err != nil {
+					return compose.Input{}, fmt.Errorf("frombus: what %s serves on %s (%s): %w", m.Module, node,
+						strings.Join(keys, ", "), err)
+				}
 			}
 			if layers := m.Layers(node, values); layers != nil {
 				if n.Settings == nil {
@@ -181,15 +290,42 @@ func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, er
 			}
 		}
 		if node == s.Node {
-			for _, module := range sortedKeys(s.Kept) {
-				man, err := read(module, s.Kept[module])
-				if err != nil {
-					return compose.Input{}, err
+			for _, module := range s.InOwn {
+				if n.InOwn == nil {
+					n.InOwn = map[string]bool{}
 				}
-				if n.Kept == nil {
-					n.Kept = map[string]catalogue.Manifest{}
+				n.InOwn[module] = true
+			}
+			for i := range s.Running {
+				// The operator export as the vault runs it: the controller composes it from its store, which the node
+				// does not read; until the export is on the bus, the node carries the file it runs (issue 1126, C6:
+				// mesh-vault.kept on novox, "in what runs, and not composed").
+				if m := s.Running[i].Module; m != "" {
+					if kept := keptOf(s.Running[i]); kept != nil {
+						if in.KeptRuns == nil {
+							in.KeptRuns = map[string]map[string]map[string]any{}
+						}
+						if in.KeptRuns[s.Node] == nil {
+							in.KeptRuns[s.Node] = map[string]map[string]any{}
+						}
+						in.KeptRuns[s.Node][m] = kept
+					}
+					continue
+				}
+				if s.Running[i].Module == "" {
+					own := s.Running[i]
+					n.RunsOwn = &own
+					// Its bus membership as it runs it: the controller composes it from its store, which the node does
+					// not read; until the grants part hands memberships sealed to the node, the node's own composition
+					// carries the one it runs (issue 1126, seed #531 on novox: "bus-membership in what runs, not
+					// composed", which applied would have taken the node's bus credential away).
+					if sealed := membershipOf(own); sealed != "" {
+						if in.BusMemberships == nil {
+							in.BusMemberships = map[string]string{}
+						}
+						in.BusMemberships[s.Node] = sealed
+					}
 				}
-				n.Kept[module] = man
 			}
 		}
 		in.Nodes = append(in.Nodes, n)
@@ -220,6 +356,9 @@ func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, er
 		if _, ok := records[s.Node]; !ok {
 			return compose.Input{}, fmt.Errorf("frombus: %s has written no record of itself yet", s.Node)
 		}
+		if err := fromBuilds(ctx, r, &in, s, placements[s.Node], modules, read, parse, refuse); err != nil {
+			return compose.Input{}, err
+		}
 		// Its own modules' secrets, sealed to its own key by the vault: a composition carries them sealed (ADR 0550 §5).
 		// Asked only when a module placed on it declares one: a node none of whose modules has a secret composes
 		// whether or not the vault answers.
@@ -240,25 +379,162 @@ func Input(ctx context.Context, r Reader, mesh Mesh, s Scope) (compose.Input, er
 	return in, nil
 }
 
-// Compose is the node's compositions over the bus (ADR 0547 §2): Input for s, then compose.CompositionsApplied at the
-// fingerprints fps gives each module: composed in the Reading mode as the controller composes them, and refused when it
-// stands in for anything the input does not carry (compose.ErrStoodIn), since the node applies what it composed.
-func Compose(ctx context.Context, r Reader, mesh Mesh, s Scope, fps map[string]string) (map[string]delivery.Composed, []string, error) {
-	in, err := Input(ctx, r, mesh, s)
+// Compose is the node's compositions over the bus (ADR 0547 §2): input for s, then composed at the fingerprints fps
+// gives each module in the Reading mode, as the controller composes them, by the one rule its answer to a candidate
+// follows too (composeEach, issue 1126): a module refused alone (its build unread or not taken in, its composition
+// refused, a stand-in for a value of its own the input does not carry, compose.ErrStoodIn) is held, named in held with
+// why, and none of its own composition is in out, so the node keeps what it last applied of it and applies the rest; a
+// node never applies a stand-in. Only a refusal that is no single module's (the node's own resources, a value served
+// elsewhere, a stand-in for the node's own) refuses the node, err.
+func Compose(ctx context.Context, r Reader, mesh Mesh, s Scope, fps map[string]string) (out map[string]delivery.Composed, skipped []string, held map[string]string, err error) {
+	held = map[string]string{}
+	in, err := input(ctx, r, mesh, s, func(module string, err error) { held[module] = err.Error() })
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, held, err
 	}
 	// The pair credentials its composition reads, asked of the vault sealed to it (ADR 0550 §5).
 	asConsumer, asProvider, err := compose.CredentialsNeeded(in, s.Node)
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, held, err
 	}
 	if len(asConsumer)+len(asProvider) > 0 {
 		if in.Credentials, in.Issued, err = r.Credentials(ctx, s.Node, asConsumer, asProvider); err != nil {
-			return nil, nil, fmt.Errorf("frombus: the credentials of %s: %w", s.Node, err)
+			return nil, nil, held, fmt.Errorf("frombus: the credentials of %s: %w", s.Node, err)
 		}
 	}
-	return compose.CompositionsApplied(in, s.Node, fps)
+	out, skipped, _, err = composeEach(in, s.Node, fps, true, s.Running, held)
+	return out, skipped, held, err
+}
+
+// fromBuilds puts in the built manifest of each module placed on the composing node, at the trunk's FP2, and of each
+// module it keeps at another build (Scope.KeptAt, into its node's Kept), read from the builder's done key and resolved
+// by the one take-in rule (takein.Manifest), a templates archive read in the artifact store as the node reaches it
+// (issue 1126).
+func fromBuilds(ctx context.Context, r Reader, in *compose.Input, s Scope, p delivery.Placement, modules map[string]delivery.Module,
+	read func(module, digest string) (catalogue.Manifest, error), parse func([]byte) (catalogue.Manifest, error),
+	refuse func(module string, err error)) error {
+	// stub keeps a refused module in the composition as a stub for this node alone (compose.Stub): what it provides
+	// and requires still shapes the rest.
+	stub := func(module string, err error) {
+		refuse(module, err)
+		for i := range in.Nodes {
+			if in.Nodes[i].Name != s.Node {
+				continue
+			}
+			man, ok := in.Nodes[i].Kept[module]
+			if !ok {
+				man, ok = in.Catalogue[module]
+			}
+			if !ok {
+				return
+			}
+			if in.Nodes[i].Kept == nil {
+				in.Nodes[i].Kept = map[string]catalogue.Manifest{}
+			}
+			in.Nodes[i].Kept[module] = compose.Stub(man)
+		}
+	}
+	address, addressErr := "", error(nil)
+	addressed := false
+	archive := func(ctx context.Context, reference, digest string) ([]byte, error) {
+		if !addressed {
+			address, addressErr = compose.ArtifactStoreAddress(*in, s.Node)
+			addressed = true
+		}
+		switch {
+		case addressErr != nil:
+			return nil, addressErr
+		case address == "":
+			return nil, fmt.Errorf("%s reaches no artifact store (%s)", s.Node, storeSought(*in))
+		}
+		return r.Archive(ctx, catalogue.Routed(reference, address), digest)
+	}
+	built := func(module, fp string, b *delivery.BuilderBuild) (catalogue.Manifest, error) {
+		if b.Manifest == "" {
+			return catalogue.Manifest{}, fmt.Errorf("frombus: the build of %s at %s names no manifest", module, fp)
+		}
+		src, err := read(module, b.Manifest)
+		if err != nil {
+			return catalogue.Manifest{}, err
+		}
+		resolved, err := takein.Manifest(ctx, src, *b, archive)
+		if err != nil {
+			return catalogue.Manifest{}, fmt.Errorf("frombus: %s at %s: %w", module, fp, err)
+		}
+		// Read back as the mesh holds a built manifest (the controller keeps the resolved manifest's bytes and reads them
+		// as any manifest): a template's text is then in the manifest's own words, its ${config:…} in the settings form.
+		raw, err := json.Marshal(resolved)
+		if err != nil {
+			return catalogue.Manifest{}, err
+		}
+		if resolved, err = parse(raw); err != nil {
+			return catalogue.Manifest{}, fmt.Errorf("frombus: the built manifest of %s at %s: %w", module, fp, err)
+		}
+		return resolved, nil
+	}
+	for _, pm := range p.Modules {
+		m, ok := modules[pm.Module]
+		if !ok || m.FP2 == "" || s.KeptAt[pm.Module] != "" || slices.Contains(s.InOwn, pm.Module) {
+			// A module it runs inside its own composition is composed there as before: no build of the new form is what
+			// it runs (Scope.InOwn).
+			continue
+		}
+		if man, ok := in.Catalogue[pm.Module]; !ok || (man.Build == nil && !man.Templated()) {
+			continue // nothing is built of it: its manifest is what it composes from
+		}
+		b, err := r.Build(ctx, pm.Module, m.FP2)
+		if err != nil {
+			err = fmt.Errorf("frombus: the build of %s at %s: %w", pm.Module, m.FP2, err)
+			if refuse == nil {
+				return err
+			}
+			stub(pm.Module, err)
+			continue
+		}
+		if b == nil || b.State != delivery.BuildDone {
+			continue // no done build at the trunk's: composed from the indexer's manifest, as before
+		}
+		resolved, err := built(pm.Module, m.FP2, b)
+		if err != nil {
+			if refuse == nil {
+				return err
+			}
+			stub(pm.Module, err)
+			continue
+		}
+		in.Catalogue[pm.Module] = resolved
+	}
+	for i := range in.Nodes {
+		if in.Nodes[i].Name != s.Node {
+			continue
+		}
+		for _, module := range sortedKeys(s.KeptAt) {
+			fp := s.KeptAt[module]
+			b, err := r.Build(ctx, module, fp)
+			switch {
+			case err != nil:
+				err = fmt.Errorf("frombus: the build of %s at %s: %w", module, fp, err)
+			case b == nil || b.State != delivery.BuildDone:
+				err = fmt.Errorf("frombus: %s is wanted at %s, of which the builder holds no done build", module, fp)
+			}
+			var resolved catalogue.Manifest
+			if err == nil {
+				resolved, err = built(module, fp, b)
+			}
+			if err != nil {
+				if refuse == nil {
+					return err
+				}
+				stub(module, err)
+				continue
+			}
+			if in.Nodes[i].Kept == nil {
+				in.Nodes[i].Kept = map[string]catalogue.Manifest{}
+			}
+			in.Nodes[i].Kept[module] = resolved
+		}
+	}
+	return nil
 }
 
 // declaresOwnSecrets says a module assigned to node declares an own secret, in the manifest the node composes it from.
@@ -283,16 +559,14 @@ func declaresOwnSecrets(in compose.Input, node string) bool {
 // nodeOf is the composition's node from its record (what the machine observes) and its placement (what a person
 // decided of it, and where its modules run).
 func nodeOf(rec delivery.NodeRecord, p delivery.Placement) compose.Node {
-	d := p.Decided
 	n := compose.Node{
-		Name:     rec.Node,
-		Place:    compose.Place{Key: rec.TunnelKey, Endpoint: d.Endpoint, Site: d.Site, Hub: d.Hub, Address: d.Address},
-		Assigned: p.Assigned(), PublicDomain: d.PublicDomain,
-		Account: d.Account, AccountHome: d.AccountHome, AgentAccount: d.AgentAccount, AgentAccountHome: d.AgentHome,
-		Adopted: d.Adopted, Taken: d.Taken, Pins: p.ChosenPins(), Bound: p.Bound(), Ports: p.HostPorts(), SealingKey: rec.SealingKey,
+		Name:         rec.Node,
+		Place:        compose.Place{Key: rec.TunnelKey},
+		SealingKey:   rec.SealingKey,
 		OutwardLinks: rec.OutwardLinks, Networks: rec.Networks, NetworksSaid: rec.NetworksSaid,
 		ServingKey: rec.ServingKey, Certificate: rec.Certificate, Contract: rec.Contract, Stated: rec.Contract > 0,
 	}
+	placeNode(&n, p)
 	if len(rec.Capabilities) > 0 {
 		n.Capabilities = make(map[string]bool, len(rec.Capabilities))
 		for _, c := range rec.Capabilities {
@@ -302,6 +576,80 @@ func nodeOf(rec delivery.NodeRecord, p delivery.Placement) compose.Node {
 	return n
 }
 
+// placeNode sets what a person decided of n and where its modules run, from its placement; what the machine observes
+// (its keys, links, networks, certificate) and its settings layers are left as they are.
+func placeNode(n *compose.Node, p delivery.Placement) {
+	d := p.Decided
+	n.Place = compose.Place{Key: n.Place.Key, Endpoint: d.Endpoint, Site: d.Site, Hub: d.Hub, Address: d.Address}
+	n.Assigned, n.PublicDomain = p.Assigned(), d.PublicDomain
+	n.Account, n.AccountHome, n.AgentAccount, n.AgentAccountHome = d.Account, d.AccountHome, d.AgentAccount, d.AgentHome
+	n.Adopted, n.Taken = d.Adopted, d.Taken
+	n.Pins, n.Bound, n.Ports = p.ChosenPins(), p.Bound(), p.HostPorts()
+}
+
+// Placed is in with the placements given standing in for those of the nodes they name (issue 1126): each such node's
+// decided parts, modules, pins, bindings, host ports, settings placement and holdings are the given placement's, its
+// config values those in already carries for it (the layer of the node's own name), and what the machine observes is
+// kept. A nil placement leaves the node in the mesh with nothing placed on it. A node in does not hold is refused: it has
+// no record to compose it from. The found tunnel and the hub's peers are read from in as they are, not from the given
+// placement. It is how a check composes a change's own placement over an input already filled (composer.Case's
+// Placements).
+func Placed(in compose.Input, placements map[string]*delivery.Placement) (compose.Input, error) {
+	if len(placements) == 0 {
+		return in, nil
+	}
+	out := in
+	out.Nodes = append([]compose.Node(nil), in.Nodes...)
+	index := map[string]int{}
+	for i, n := range out.Nodes {
+		index[n.Name] = i
+	}
+	for _, node := range sortedKeys(placements) {
+		p := placements[node]
+		i, ok := index[node]
+		if !ok {
+			return compose.Input{}, fmt.Errorf("frombus: a placement is given for %s, which the input holds no node for", node)
+		}
+		if p == nil {
+			p = &delivery.Placement{Node: node}
+		}
+		if p.Node != node {
+			return compose.Input{}, fmt.Errorf("frombus: the placement given for %s names the node %q", node, p.Node)
+		}
+		n := out.Nodes[i]
+		placeNode(&n, *p)
+		settings := map[string][]catalogue.Layer{}
+		for _, m := range p.Modules {
+			var values map[string]any
+			for _, l := range n.Settings[m.Module] {
+				if l.From == node {
+					values = l.Values
+				}
+			}
+			if layers := m.Layers(node, values); layers != nil {
+				settings[m.Module] = layers
+			}
+		}
+		n.Settings = nil
+		if len(settings) > 0 {
+			n.Settings = settings
+		}
+		out.Nodes[i] = n
+	}
+	out.Holdings = nil
+	for _, h := range in.Holdings {
+		if _, given := placements[h.Node]; !given {
+			out.Holdings = append(out.Holdings, h)
+		}
+	}
+	for _, node := range sortedKeys(placements) {
+		if p := placements[node]; p != nil {
+			out.Holdings = append(out.Holdings, p.Held()...)
+		}
+	}
+	return out, nil
+}
+
 func tunnelOf(t delivery.RecordTunnel) compose.Tunnel {
 	out := compose.Tunnel{Interface: t.Interface, Unit: t.Unit, Config: t.Config, Port: t.Port, MTU: t.MTU,
 		Address: t.Address, Range: t.Range, PublicKey: t.PublicKey}
@@ -356,3 +704,53 @@ func sortedKeys[V any](m map[string]V) []string {
 	sort.Strings(out)
 	return out
 }
+
+// storeSought says, for a node that reaches no artifact store, what the composition holds of one: the nodes it holds and
+// where each module serving the artifact store is placed, so the refusal names why (issue 1126).
+func storeSought(in compose.Input) string {
+	var nodes, where []string
+	for _, n := range in.Nodes {
+		nodes = append(nodes, n.Name)
+		for _, a := range n.Assigned {
+			if m, ok := in.Catalogue[a]; ok {
+				if _, serves := m.Serves[catalogue.ArtifactStoreProvision]; serves {
+					where = append(where, a+" on "+n.Name)
+				}
+			}
+		}
+	}
+	sort.Strings(nodes)
+	sort.Strings(where)
+	said := "the composition holds " + strings.Join(nodes, ", ")
+	if len(where) == 0 {
+		return said + "; no module placed there serves " + catalogue.ArtifactStoreProvision
+	}
+	return said + "; " + catalogue.ArtifactStoreProvision + " is served by " + strings.Join(where, ", ") +
+		", none of it on the private network with a port"
+}
+
+// keptOf is the operator export's file (catalogue.KeptID) of a module's composition as it runs, or nil.
+func keptOf(c delivery.Composed) map[string]any {
+	for _, raw := range c.Resources {
+		var r map[string]any
+		if json.Unmarshal(raw, &r) == nil && r["id"] == c.Module+"."+catalogue.KeptID() {
+			return r
+		}
+	}
+	return nil
+}
+
+// membershipOf is the sealed value of the bus membership resource (catalogue.BusMembershipID) of a node's own
+// composition, or "".
+func membershipOf(own delivery.Composed) string {
+	for _, raw := range own.Resources {
+		var r struct {
+			ID     string `json:"id"`
+			Sealed string `json:"sealed"`
+		}
+		if json.Unmarshal(raw, &r) == nil && r.ID == catalogue.BusMembershipID() {
+			return r.Sealed
+		}
+	}
+	return ""
+}

go/compose/frombus/frombus_test.go

@@ -1,14 +1,19 @@
 package frombus
 
 import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
 	"context"
 	"crypto/ecdh"
 	"crypto/rand"
 	"encoding/base64"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"os"
 	"reflect"
+	"slices"
 	"strings"
 	"testing"
 
@@ -28,6 +33,42 @@ type bus struct {
 	valuesRead []string
 	own        []compose.OwnSecretRow
 	ownErr     error
+	// asked is every consumer credential asked; the fake refuses the whole ask, as the vault's own does, for a consuming
+	// module its placement does not put on the node.
+	asked []compose.CredentialKey
+	// builds are the builder's keys, by "<module> <fp>"; archives the artifact store's blobs, by digest, and fetched
+	// every URL asked; served another node's values by "<node>.<module>", and servedRead every ask with its keys.
+	builds     map[string]*delivery.BuilderBuild
+	archives   map[string][]byte
+	fetched    []string
+	served     map[string]map[string]any
+	servedRead []string
+	buildsRead []string
+}
+
+func (b *bus) Build(_ context.Context, module, fp string) (*delivery.BuilderBuild, error) {
+	b.buildsRead = append(b.buildsRead, module)
+	return b.builds[module+" "+fp], nil
+}
+
+func (b *bus) Archive(_ context.Context, url, digest string) ([]byte, error) {
+	b.fetched = append(b.fetched, url)
+	body, ok := b.archives[digest]
+	if !ok {
+		return nil, errors.New("the store holds no such blob")
+	}
+	return body, nil
+}
+
+func (b *bus) Served(_ context.Context, node, module string, keys []string) (map[string]any, error) {
+	b.servedRead = append(b.servedRead, node+"."+module+":"+strings.Join(keys, ","))
+	out := map[string]any{}
+	for _, k := range keys {
+		if v, ok := b.served[node+"."+module][k]; ok {
+			out[k] = v
+		}
+	}
+	return out, nil
 }
 
 func (b *bus) Placements(context.Context) (map[string]delivery.Placement, error) {
@@ -46,7 +87,17 @@ func (b *bus) OwnSecrets(context.Context, string) ([]compose.OwnSecretRow, error
 	return b.own, b.ownErr
 }
 
-func (b *bus) Credentials(context.Context, string, []compose.CredentialKey, []compose.CredentialKey) ([]compose.Credential, []compose.Issued, error) {
+func (b *bus) Credentials(_ context.Context, node string, asConsumer, _ []compose.CredentialKey) ([]compose.Credential, []compose.Issued, error) {
+	b.asked = append(b.asked, asConsumer...)
+	for _, k := range asConsumer {
+		placed := false
+		for _, m := range b.placements[node].Modules {
+			placed = placed || m.Module == k.ConsumerModule
+		}
+		if !placed {
+			return nil, nil, fmt.Errorf("%s is not on %s: neither assigned there nor required by a module there", k.ConsumerModule, node)
+		}
+	}
 	return nil, nil, nil
 }
 
@@ -68,6 +119,11 @@ func publicKey(t *testing.T) string {
 // controller's store fills for compose's own two-machine mesh (compose's aMesh: anchor the hub, laptop), and that Input
 // composes; a node reads only its own config values; what cannot be composed is refused, naming it.
 func TestInput(t *testing.T) {
+	// Issue 1126, the seed's shadow: every refusal named, an old-form module left to the node, and no store reached
+	// saying why (answer_rows_test.go).
+	t.Run("every refusal, and an old build left to the node", answerNamesEveryRefusalAndLeavesAnOldBuildToTheNode)
+	t.Run("no store reached says why", noStoreReachedSaysWhy)
+	t.Run("another node not resolved is named", otherNodeNotResolvedIsNamed)
 	ctx := context.Background()
 	xterm, err := os.ReadFile("../../catalogue/testdata/catalogue-835bf22b-xterm.module.json")
 	if err != nil {
@@ -167,7 +223,10 @@ func TestInput(t *testing.T) {
 	// The same composer over both: the compositions from the bus are the store's, byte for byte.
 	fps := map[string]string{overlay.Name: "src2:" + strings.Repeat("a", 64), "xterm": "src2:" + strings.Repeat("b", 64),
 		"media": "src2:" + strings.Repeat("c", 64)}
-	fromBus, _, err := Compose(ctx, mk(), Mesh{}, Scope{Node: "laptop"}, fps)
+	fromBus, _, held, err := Compose(ctx, mk(), Mesh{}, Scope{Node: "laptop"}, fps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -179,6 +238,233 @@ func TestInput(t *testing.T) {
 		t.Fatalf("compositions differ or are empty: %d from the bus, %d from the store", len(fromBus), len(fromStore))
 	}
 
+	// Issue 1126: a candidate placement equal to the node's composes what it runs, and CompareComposed says so; one
+	// thing changed in the group's candidate of another node (the hub's endpoint) names exactly the module it moves
+	// here. Placed puts the same placement over the store's input unchanged.
+	running := make([]delivery.Composed, 0, len(fromBus))
+	for _, c := range fromBus {
+		running = append(running, c)
+	}
+	laptop := mk().placements["laptop"]
+	asIs, _, held, err := Compose(ctx, mk(), Mesh{}, Scope{Node: "laptop", Placements: map[string]*delivery.Placement{"laptop": &laptop}}, fps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c := delivery.CompareComposed(asIs, running); len(c.Differs)+len(c.Added)+len(c.Removed) != 0 || len(c.Same) != len(running) {
+		t.Errorf("the candidate equal to the placement: %+v", c)
+	}
+	moved := mk().placements["anchor"]
+	moved.Decided.Endpoint = "anchor.example:51821"
+	changed, _, held, err := Compose(ctx, mk(), Mesh{}, Scope{Node: "laptop", Placements: map[string]*delivery.Placement{"laptop": &laptop, "anchor": &moved}}, fps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c := delivery.CompareComposed(changed, running); len(c.Differs) != 1 || c.Differs[0].Module != overlay.Name || c.Differs[0].Resource != overlay.Name+".overlay-config" {
+		t.Errorf("the hub's endpoint changed: %+v, want %s alone, naming its config", c, overlay.Name)
+	}
+	if c := delivery.CompareComposed(changed, running[:0]); len(c.Added) != len(changed) {
+		t.Errorf("nothing runs: %+v", c)
+	}
+
+	// ADR 0559 §4, the node's answer: the same; one module differing; a module the group adds, whose own secret is not
+	// yet issued (no refusal); a value missing for a module the node runs (a refusal); a module the candidate removes.
+	keeper := []byte(`{"module":"keeper","version":"1","own-secrets":{"password":"/var/lib/mesh/keeper/password"},` +
+		`"resources":[{"id":"state","type":"directory","path":"/var/lib/mesh/keeper","mode":"0700"}]}`)
+	lemurs := []byte(`{"module":"lemurs","version":"1","capabilities":["systemd"],"resources":[{"id":"service","type":"service","unit":"lemurs.service","state":"running","boot":"enabled"}]}`)
+	// A provider and a consumer of a pair credential on the one node (compose's objects and files).
+	objects, _ := json.Marshal(catalogue.Manifest{Module: "objects", Version: "1",
+		Provides: []catalogue.Offer{{Name: "s3-bucket", Scope: catalogue.ScopeMesh, Identity: &catalogue.OfferIdentity{Max: 20, In: "an S3 access key"}}},
+		Receives: map[string]string{"s3-bucket": "/var/lib/mesh/objects/mesh.json"}})
+	files, _ := json.Marshal(catalogue.Manifest{Module: "files", Version: "1", Requires: []string{"s3-bucket"},
+		Resources: []map[string]any{{"id": "config", "type": "file", "path": "/etc/files/config.json", "mode": "0600", "content": "{}", "merge": "json"}}})
+	one := func(placed ...string) *bus {
+		p := delivery.Placement{Node: "n1", Decided: delivery.NodeDecided{Hub: true, Address: "10.77.0.1"}}
+		for _, m := range placed {
+			p.Modules = append(p.Modules, delivery.PlacedModule{Module: m})
+		}
+		return &bus{placements: map[string]delivery.Placement{"n1": p},
+			records: map[string]delivery.NodeRecord{"n1": {Node: "n1", TunnelKey: keys["anchor"], SealingKey: "sk", Capabilities: []string{"systemd"}}},
+			modules: map[string]delivery.Module{"keeper": {Manifest: delivery.ManifestDigest(keeper)}, "lemurs": {Manifest: delivery.ManifestDigest(lemurs)},
+				"objects": {Manifest: delivery.ManifestDigest(objects)}, "files": {Manifest: delivery.ManifestDigest(files)}},
+			manifests: map[string][]byte{delivery.ManifestDigest(keeper): keeper, delivery.ManifestDigest(lemurs): lemurs,
+				delivery.ManifestDigest(objects): objects, delivery.ManifestDigest(files): files},
+			own: []compose.OwnSecretRow{{Node: "n1", Module: "keeper", Name: "password", Origin: "made", SealedTo: "sk", Sealed: `"box"`}}}
+	}
+	oneFps := map[string]string{"keeper": "src2:" + strings.Repeat("d", 64), "lemurs": "src2:" + strings.Repeat("e", 64),
+		"objects": "src2:" + strings.Repeat("f", 64), "files": "src2:" + strings.Repeat("0", 64)}
+	runs, _, held, err := Compose(ctx, one("keeper", "lemurs"), Mesh{}, Scope{Node: "n1"}, oneFps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	var runsNow []delivery.Composed
+	for _, c := range runs {
+		runsNow = append(runsNow, c)
+	}
+	objectsRun, _, held, err := Compose(ctx, one("objects"), Mesh{}, Scope{Node: "n1"}, oneFps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	var consumerRuns []delivery.Composed
+	for _, c := range objectsRun {
+		consumerRuns = append(consumerRuns, c)
+	}
+	withoutOwn := func(cs []delivery.Composed) []delivery.Composed {
+		var out []delivery.Composed
+		for _, c := range cs {
+			if c.Module != "" {
+				out = append(out, c)
+			}
+		}
+		return out
+	}
+	// What the controller runs on n1 for a module no want names (lemurs, at a build of the old form) and the private
+	// network's (built by nobody): its composed writer (mesh-controller compositionsOf) folds their resources into the
+	// node's own, each in its place, its module taken off; the rest split by module.
+	tunnelled := func() *bus {
+		b := one("keeper", "lemurs", overlay.Name)
+		p := b.placements["n1"]
+		p.Decided.Endpoint = "n1.example:51820"
+		b.placements["n1"] = p
+		return b
+	}
+	tunnelledAs := func() map[string]*delivery.Placement {
+		p := tunnelled().placements["n1"]
+		return map[string]*delivery.Placement{"n1": &p}
+	}
+	folded := func() []delivery.Composed {
+		b := tunnelled()
+		in, err := Input(ctx, b, Mesh{}, Scope{Node: "n1"})
+		if err != nil {
+			t.Fatal(err)
+		}
+		reading := in
+		reading.Nodes = append([]compose.Node(nil), in.Nodes...)
+		reading.Nodes[0].ReadsModules = true
+		d, _, err := compose.ComposeIn(reading, "n1", compose.Reading)
+		if err != nil {
+			t.Fatal(err)
+		}
+		body, err := d.Body()
+		if err != nil {
+			t.Fatal(err)
+		}
+		var envelope struct {
+			Resources []map[string]json.RawMessage `json:"resources"`
+		}
+		if err := json.Unmarshal(body, &envelope); err != nil {
+			t.Fatal(err)
+		}
+		var resources []json.RawMessage
+		for _, r := range envelope.Resources {
+			var module string
+			_ = json.Unmarshal(r["module"], &module)
+			if module == "lemurs" || module == overlay.Name {
+				delete(r, "module")
+			}
+			raw, _ := json.Marshal(r)
+			resources = append(resources, raw)
+		}
+		split, err := delivery.SplitComposed("n1", resources, map[string]string{"keeper": oneFps["keeper"]}, nil, delivery.NodeOwn{})
+		if err != nil {
+			t.Fatal(err)
+		}
+		var out []delivery.Composed
+		for _, c := range split {
+			out = append(out, c)
+		}
+		return out
+	}()
+	if got := InOwn(folded, tunnelled().placements["n1"]); !reflect.DeepEqual(got, []string{"lemurs", overlay.Name}) {
+		t.Errorf("InOwn of the controller's composition = %v, want lemurs and %s", got, overlay.Name)
+	}
+	placedAs := func(modules ...string) map[string]*delivery.Placement {
+		p := one(modules...).placements["n1"]
+		return map[string]*delivery.Placement{"n1": &p}
+	}
+	for name, c := range map[string]struct {
+		b       *bus
+		given   map[string]*delivery.Placement
+		running []delivery.Composed
+		verdict string
+		check   func(delivery.CandidateAnswer) bool
+	}{
+		"the same": {one("keeper", "lemurs"), placedAs("keeper", "lemurs"), runsNow, delivery.CandidateSame,
+			func(a delivery.CandidateAnswer) bool {
+				return len(a.Same) == 3 && a.Proposal == "p-h1" && a.Revision == 7
+			}},
+		"the node runs no own composition": {one("keeper", "lemurs"), placedAs("keeper", "lemurs"), withoutOwn(runsNow), delivery.CandidateSame,
+			func(a delivery.CandidateAnswer) bool { return len(a.Same) == 2 && len(a.Added) == 0 }},
+		"one removed": {one("keeper", "lemurs"), placedAs("keeper"), runsNow, delivery.CandidateDiffers,
+			func(a delivery.CandidateAnswer) bool { return reflect.DeepEqual(a.Removed, []string{"lemurs"}) }},
+		"one added, its secret not yet issued": {func() *bus { b := one("lemurs"); b.own = nil; return b }(), placedAs("keeper", "lemurs"),
+			nil, delivery.CandidateDiffers, func(a delivery.CandidateAnswer) bool {
+				for _, m := range a.Added {
+					if m.Module == "keeper" {
+						return reflect.DeepEqual(m.Unissued, []string{"keeper/password"}) && len(a.Refusals) == 0
+					}
+				}
+				return false
+			}},
+		"a value missing for a module that runs": {func() *bus { b := one("keeper", "lemurs"); b.own = nil; return b }(), placedAs("keeper", "lemurs"),
+			runsNow, delivery.CandidateRefused, func(a delivery.CandidateAnswer) bool {
+				return len(a.Refusals) == 1 && a.Refusals[0].Module == "keeper" && strings.Contains(a.Refusals[0].Why, "keeper/password")
+			}},
+		// Review of L2b, round 1, finding 1: a consumer the candidate adds has no credential yet, and the vault refuses an
+		// ask for a module not on the node; it is not asked, and the module is added, its credential not yet issued.
+		"a consumer added, the vault not asked for it": {one("objects"), placedAs("objects", "files"), consumerRuns, delivery.CandidateDiffers,
+			func(a delivery.CandidateAnswer) bool {
+				return len(a.Added) == 1 && a.Added[0].Module == "files" && len(a.Added[0].Unissued) > 0 && len(a.Refusals) == 0
+			}},
+		// And with no trunk at all (the seed), a stand-in of a module the node runs is a refusal, not an addition.
+		"the seed, a value missing for a module that runs": {func() *bus { b := one(); b.own = nil; return b }(), placedAs("keeper", "lemurs"),
+			runsNow, delivery.CandidateRefused, func(a delivery.CandidateAnswer) bool {
+				return len(a.Refusals) == 1 && a.Refusals[0].Module == "keeper" && len(a.Added) == 0
+			}},
+		"cannot compose": {one("keeper"), map[string]*delivery.Placement{"n1": {Node: "n2"}}, runsNow, delivery.CandidateRefused,
+			func(a delivery.CandidateAnswer) bool { return a.Refused != "" }},
+		// Issue 1126 (the seed's review): the private network's module and one at a build of the old form, which no want
+		// names and the controller folds into the node's own, are folded there again: the node's own is the same, and
+		// neither is added.
+		"mesh-wireguard and an old-form module, folded": {tunnelled(), tunnelledAs(),
+			folded, delivery.CandidateSame, func(a delivery.CandidateAnswer) bool { return len(a.Same) == 2 && len(a.Added) == 0 }},
+	} {
+		fps := oneFps
+		if name == "mesh-wireguard and an old-form module, folded" {
+			fps = map[string]string{"keeper": oneFps["keeper"]} // the node's wants: no build of lemurs or the private network
+		}
+		a := Answer(ctx, c.b, Mesh{}, Scope{Node: "n1", Placements: c.given, InOwn: InOwn(c.running, *c.given["n1"])}, fps, c.running, "p-h1", 7)
+		if a.Verdict != c.verdict || !c.check(a) {
+			t.Errorf("%s: %+v", name, a)
+		}
+		if raw, err := delivery.EncodeHaveNode(delivery.HaveNode{Candidates: map[string]delivery.CandidateAnswer{"g": a}}); err != nil {
+			t.Errorf("%s: the answer is not one a have holds: %v (%s)", name, err, raw)
+		}
+	}
+	if got, err := Placed(want, map[string]*delivery.Placement{"laptop": &laptop}); err != nil || !reflect.DeepEqual(got, want) {
+		t.Errorf("Placed with the node's own placement changes the input: %v", err)
+	}
+	if got, err := Placed(want, map[string]*delivery.Placement{"laptop": nil}); err != nil || len(got.Nodes[1].Assigned) != 0 || got.Nodes[1].Place.Key != keys["laptop"] {
+		t.Errorf("Placed with no placement: %+v, %v", got.Nodes[1], err)
+	}
+	if _, err := Placed(want, map[string]*delivery.Placement{"stranger": {Node: "stranger"}}); err == nil {
+		t.Error("Placed a node the input holds no node for")
+	}
+	if _, err := Input(ctx, mk(), Mesh{}, Scope{Node: "laptop", Placements: map[string]*delivery.Placement{"laptop": {Node: "anchor"}}}); err == nil {
+		t.Error("a given placement naming another node was taken")
+	}
+
 	// ADR 0555 §6: Export is Input's inverse for what a person decides: the store's input exported, node by node, is the
 	// placement the bus holds, and read back it is the store's input again.
 	for node, placed := range mk().placements {
@@ -215,11 +501,203 @@ func TestInput(t *testing.T) {
 		t.Error("laptop's media, which declares an own secret, composed without the vault")
 	}
 
+	// A module the node's want keeps at another build than the trunk's composes from that build's manifest, resolved with
+	// what it made (issue 1126), on the composing node alone.
 	kept := mk()
-	kept.manifests["old"] = xterm
-	in, err := Input(ctx, kept, Mesh{}, Scope{Node: "laptop", Kept: map[string]string{"xterm": "old"}})
-	if err != nil || !reflect.DeepEqual(in.Nodes[1].Kept, map[string]catalogue.Manifest{"xterm": parsed}) || in.Nodes[0].Kept != nil {
-		t.Errorf("the want's manifest is kept on the composing node alone: %v, %v", in.Nodes, err)
+	oldXterm := []byte(`{"module":"xterm","version":"1","resources":[{"id":"tools","type":"process","name":"xterm-tools",` +
+		`"artifact":"tools","run":["./xterm-tools"]}],"build":{"artifacts":[{"name":"tools","kind":"bundle","language":"go","system":"arch","from":"cmd/xterm-tools","binary":"xterm-tools"}]}}`)
+	kept.manifests["old"] = oldXterm
+	oldFP := "src2:" + strings.Repeat("9", 64)
+	toolsRef := "artifact-store://xterm/tools/blobs/sha256:" + strings.Repeat("1", 64)
+	kept.builds = map[string]*delivery.BuilderBuild{"xterm " + oldFP: {State: delivery.BuildDone, Manifest: "old",
+		Artifacts: []delivery.BuiltArtifact{{Name: "tools", Kind: "bundle", Reference: toolsRef, Digest: "sha256:" + strings.Repeat("1", 64)}}}}
+	parsedOld, err := catalogue.ParseManifestForInputs(oldXterm)
+	if err != nil {
+		t.Fatal(err)
+	}
+	keptBuilt, err := parsedOld.Resolve([]catalogue.Built{{Name: "tools", Kind: "bundle", Reference: toolsRef, Digest: "sha256:" + strings.Repeat("1", 64)}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	in, err := Input(ctx, kept, Mesh{}, Scope{Node: "laptop", KeptAt: map[string]string{"xterm": oldFP}})
+	if err != nil || !reflect.DeepEqual(in.Nodes[1].Kept, map[string]catalogue.Manifest{"xterm": keptBuilt}) || in.Nodes[0].Kept != nil {
+		t.Errorf("the want's build is kept on the composing node alone: %v, %v", in.Nodes, err)
+	}
+
+	// Issue 1126, the seed's refusals. restic and the provisioner's client as the catalogue holds them (mesh-catalog
+	// c05aa5e6), restic moved with an own secret the vault leaves out (it hands it to the client, mesh-vault ownnode.go
+	// handed): composed from the indexer's manifest restic is not handed and stands in for that secret, as novox's,
+	// ace's, g14's and shanks's answers refused; composed from its build, it is handed, its templates archive read
+	// where the node reaches the artifact store, and the composition is the one the controller's take-in gives.
+	resticRaw, err := os.ReadFile("testdata/catalogue-c05aa5e6-restic.module.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	clientRaw, err := os.ReadFile("testdata/catalogue-c05aa5e6-mesh-provisioner-client.module.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	store := []byte(`{"module":"store","version":"1","provides":[{"name":"artifact-store","scope":"mesh"}],` +
+		`"serves":{"artifact-store":{"port":5000}}}`)
+	texts := map[string]string{}
+	var packed bytes.Buffer
+	zw := gzip.NewWriter(&packed)
+	tw := tar.NewWriter(zw)
+	for _, f := range []string{"backups.conf", "data.conf", "retention.conf"} {
+		text, err := os.ReadFile("testdata/catalogue-c05aa5e6-restic.files/" + f)
+		if err != nil {
+			t.Fatal(err)
+		}
+		texts[f] = string(text)
+		if err := tw.WriteHeader(&tar.Header{Name: "./" + f, Mode: 0o644, Size: int64(len(text)), Typeflag: tar.TypeReg}); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := tw.Write(text); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := tw.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatal(err)
+	}
+	archiveDigest := delivery.ManifestDigest(packed.Bytes())
+	digestOf := func(c string) string { return "sha256:" + strings.Repeat(c, 64) }
+	movedFps := map[string]string{"restic": "src2:" + strings.Repeat("3", 64), "mesh-provisioner-client": "src2:" + strings.Repeat("4", 64),
+		"store": "src2:" + strings.Repeat("5", 64)}
+	resticArtifacts := []delivery.BuiltArtifact{{Name: "tools", Kind: "bundle", Reference: "artifact-store://restic/tools/blobs/" + digestOf("6"), Digest: digestOf("6")},
+		{Name: "files", Kind: "archive", Reference: "artifact-store://restic/files/blobs/" + archiveDigest, Digest: archiveDigest}}
+	clientArtifacts := []delivery.BuiltArtifact{{Name: "client", Kind: "bundle", Reference: "artifact-store://mesh-provisioner-client/client/blobs/" + digestOf("7"), Digest: digestOf("7")}}
+	movedMesh := func(built bool) *bus {
+		b := one()
+		p := b.placements["n1"]
+		p.Modules = []delivery.PlacedModule{{Module: "store"}, {Module: "mesh-provisioner-client"}, {Module: "restic"}}
+		p.Decided.Account, p.Decided.AccountHome = "operator", "/home/operator"
+		b.placements["n1"] = p
+		rec := b.records["n1"]
+		rec.Contract, rec.Capabilities = compose.HandedContract, []string{"systemd", "package-manager"}
+		b.records["n1"] = rec
+		b.modules = map[string]delivery.Module{}
+		b.manifests = map[string][]byte{}
+		for module, raw := range map[string][]byte{"restic": resticRaw, "mesh-provisioner-client": clientRaw, "store": store} {
+			b.modules[module] = delivery.Module{FP2: movedFps[module], Manifest: delivery.ManifestDigest(raw)}
+			b.manifests[delivery.ManifestDigest(raw)] = raw
+		}
+		// The vault's own answer: the client's own secret; restic's is the client's to ask, so own leaves it out.
+		b.own = []compose.OwnSecretRow{{Node: "n1", Module: "mesh-provisioner-client", Name: "provisioner-broker", Origin: "made", SealedTo: "sk", Sealed: `"box"`}}
+		if built {
+			b.builds = map[string]*delivery.BuilderBuild{
+				"restic " + movedFps["restic"]:                                   {State: delivery.BuildDone, Manifest: delivery.ManifestDigest(resticRaw), Artifacts: resticArtifacts},
+				"mesh-provisioner-client " + movedFps["mesh-provisioner-client"]: {State: delivery.BuildDone, Manifest: delivery.ManifestDigest(clientRaw), Artifacts: clientArtifacts},
+				"store " + movedFps["store"]:                                     {State: delivery.BuildDone, Manifest: delivery.ManifestDigest(store)},
+			}
+			b.archives = map[string][]byte{archiveDigest: packed.Bytes()}
+		}
+		return b
+	}
+	if out, _, held, err := Compose(ctx, movedMesh(false), Mesh{}, Scope{Node: "n1"}, movedFps); err != nil || !strings.Contains(held["restic"], `restic needs a secret called "repository"`) {
+		t.Errorf("restic composed from the indexer's manifest: %v %v, want its own secret refusing restic alone", err, held)
+	} else {
+		for key, c := range out {
+			if c.Module == "restic" {
+				// Its stub's composition, applied, would remove what restic runs: a held module keeps its last one.
+				t.Errorf("held restic is composed as %s, want none of its own composition handed", key)
+			}
+		}
+	}
+	builtBus := movedMesh(true)
+	fromBuild, _, held, err := Compose(ctx, builtBus, Mesh{}, Scope{Node: "n1"}, movedFps)
+	if err == nil && len(held) > 0 {
+		err = fmt.Errorf("modules held: %v", held)
+	}
+	if err != nil {
+		t.Fatalf("restic composed from its build: %v", err)
+	}
+	if !reflect.DeepEqual(builtBus.fetched, []string{"http://127.0.0.1:5000/v2/restic/files/blobs/" + archiveDigest}) {
+		t.Errorf("the templates archive was read at %v", builtBus.fetched)
+	}
+	resticKey, _ := delivery.ComposedKey("n1", "restic", movedFps["restic"])
+	if c := fromBuild[resticKey]; len(c.Filled) != 4 { // its three templated files and its own secret
+		t.Errorf("restic is not handed to the provisioner: its filled files are %v", c.Filled)
+	}
+	// A done key an artifact of which names no reference is waited for, in the controller's words (ADR 0498 §8).
+	unreferenced := movedMesh(true)
+	unreferenced.builds["restic "+movedFps["restic"]].Artifacts = []delivery.BuiltArtifact{{Name: "tools", Kind: "bundle", Digest: digestOf("6")}, resticArtifacts[1]}
+	if _, _, held, err := Compose(ctx, unreferenced, Mesh{}, Scope{Node: "n1"}, movedFps); err != nil || !strings.Contains(held["restic"], "the build of restic is done and waits for the reference of tools") {
+		t.Errorf("a done key with an unreferenced artifact: %v %v, want restic held alone", err, held)
+	}
+	// A module the node runs inside its own composition (the fold) composes from the indexer's manifest though a done
+	// build of it is at the trunk's FP2: its build is not read.
+	folding := movedMesh(true)
+	foldIn, err := Input(ctx, folding, Mesh{}, Scope{Node: "n1", InOwn: []string{"mesh-provisioner-client"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	clientParsed, err := catalogue.ParseManifestForInputs(clientRaw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if slices.Contains(folding.buildsRead, "mesh-provisioner-client") || !reflect.DeepEqual(foldIn.Catalogue["mesh-provisioner-client"], clientParsed) {
+		t.Errorf("a folded module was taken from its build: builds read %v", folding.buildsRead)
+	}
+	// The controller's: its take-in resolves each manifest with the key's artifacts and the archive's texts, and composes
+	// from those over the same input.
+	storeIn, err := Input(ctx, movedMesh(false), Mesh{}, Scope{Node: "n1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for module, built := range map[string][]catalogue.Built{
+		"restic": {{Name: "tools", Kind: "bundle", Reference: resticArtifacts[0].Reference, Digest: digestOf("6")},
+			{Name: "files", Kind: "archive", Reference: resticArtifacts[1].Reference, Digest: archiveDigest, Texts: texts}},
+		"mesh-provisioner-client": {{Name: "client", Kind: "bundle", Reference: clientArtifacts[0].Reference, Digest: digestOf("7")}},
+	} {
+		resolved, err := storeIn.Catalogue[module].Resolve(built)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// Kept as its bytes and read again, as the controller's store holds a build's manifest.
+		raw, _ := json.Marshal(resolved)
+		if storeIn.Catalogue[module], err = catalogue.ParseManifestForInputs(raw); err != nil {
+			t.Fatal(err)
+		}
+	}
+	storeIn.OwnSecrets = movedMesh(true).own
+	fromStoreMoved, _, err := compose.Compositions(storeIn, "n1", movedFps, compose.Reading)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(fromBuild, fromStoreMoved) {
+		gj, _ := json.MarshalIndent(fromBuild, "", " ")
+		wj, _ := json.MarshalIndent(fromStoreMoved, "", " ")
+		t.Errorf("composed from the build differs from the controller's take-in:\n got %s\nwant %s", gj, wj)
+	}
+
+	// And what a provider on another node serves from its settings (mailu's smtp domain, issue 1126: shanks refused
+	// '${setting:domain} ... nothing sets "domain"'): read for that provider's served keys alone, through Served.
+	mailer := []byte(`{"module":"mailer","version":"1","config":{"domain":{"type":"string","description":"the mail domain","required":true}},` +
+		`"provides":[{"name":"smtp","scope":"mesh"}],"serves":{"smtp":{"port":587,"domain":"${config:domain}"}}}`)
+	withMailer := func(set bool) *bus {
+		b := mk()
+		p := b.placements["anchor"]
+		p.Modules = append(p.Modules, delivery.PlacedModule{Module: "mailer"})
+		b.placements["anchor"] = p
+		b.modules["mailer"] = delivery.Module{Manifest: delivery.ManifestDigest(mailer)}
+		b.manifests[delivery.ManifestDigest(mailer)] = mailer
+		if set {
+			b.served = map[string]map[string]any{"anchor.mailer": {"domain": "example.org"}}
+		}
+		return b
+	}
+	if _, _, _, err := Compose(ctx, withMailer(false), Mesh{}, Scope{Node: "laptop"}, fps); err == nil || !strings.Contains(err.Error(), `nothing sets "domain"`) {
+		t.Errorf("a provider's served setting nobody sets: %v", err)
+	}
+	served := withMailer(true)
+	if _, _, held, err := Compose(ctx, served, Mesh{}, Scope{Node: "laptop"}, fps); err != nil || len(held) > 0 {
+		t.Errorf("laptop with what anchor's mailer serves: %v %v", err, held)
+	}
+	if !reflect.DeepEqual(served.servedRead, []string{"anchor.mailer:domain"}) || slices.Contains(served.valuesRead, "anchor.mailer") {
+		t.Errorf("laptop read %v of other nodes (and %v of config values): the served keys of anchor's mailer alone", served.servedRead, served.valuesRead)
 	}
 
 	for name, c := range map[string]struct {
@@ -227,10 +705,10 @@ func TestInput(t *testing.T) {
 		scope  Scope
 		says   string
 	}{
-		"no record":         {func(b *bus) { delete(b.records, "laptop") }, Scope{Node: "anchor"}, "laptop, whose agent has written no record"},
-		"no placement":      {func(b *bus) {}, Scope{Node: "stranger"}, "stranger has no placement"},
-		"a manifest unread": {func(b *bus) { delete(b.manifests, digest) }, Scope{Node: "laptop"}, "the manifest of xterm"},
-		"a kept one unread": {func(b *bus) {}, Scope{Node: "laptop", Kept: map[string]string{"xterm": "gone"}}, "digest gone"},
+		"no record":          {func(b *bus) { delete(b.records, "laptop") }, Scope{Node: "anchor"}, "laptop, whose agent has written no record"},
+		"no placement":       {func(b *bus) {}, Scope{Node: "stranger"}, "stranger has no placement"},
+		"a manifest unread":  {func(b *bus) { delete(b.manifests, digest) }, Scope{Node: "laptop"}, "the manifest of xterm"},
+		"a kept one unbuilt": {func(b *bus) {}, Scope{Node: "laptop", KeptAt: map[string]string{"xterm": "src2:gone"}}, "holds no done build"},
 	} {
 		b := mk()
 		c.change(b)

go/compose/frombus/testdata/catalogue-c05aa5e6-mesh-provisioner-client.module.json

@@ -0,0 +1,60 @@
+{
+  "module": "mesh-provisioner-client",
+  "version": "1",
+  "claims": [
+    {
+      "name": "node-provisioner",
+      "scope": "node"
+    }
+  ],
+  "own-secrets": {
+    "provisioner-broker": "${dir:state}/broker"
+  },
+  "secrets-owner": "mesh-provisioner-client",
+  "resources": [
+    {
+      "id": "account",
+      "type": "user",
+      "name": "mesh-provisioner-client",
+      "shell": "/usr/bin/nologin",
+      "home": "/var/lib/mesh-provisioner-client"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "mesh-provisioner-client",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "client",
+      "type": "process",
+      "name": "mesh-provisioner-client",
+      "artifact": "client",
+      "run": [
+        "./mesh-provisioner-client"
+      ],
+      "env": {
+        "MESH_PROVISIONER_CREDENTIAL": "${dir:state}/broker",
+        "MESH_PROVISIONER_STATE": "${dir:state}"
+      },
+      "user": "mesh-provisioner-client",
+      "health": {
+        "kind": "unit"
+      }
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "client",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/mesh-provisioner-client",
+        "binary": "mesh-provisioner-client"
+      }
+    ]
+  }
+}

go/compose/frombus/testdata/catalogue-c05aa5e6-restic.files/backups.conf

@@ -0,0 +1,2 @@
+# What the modules on this machine back up, composed by the mesh (novox/hq to-be 43). Do not edit.
+${backup:lines}

go/compose/frombus/testdata/catalogue-c05aa5e6-restic.files/data.conf

@@ -0,0 +1,2 @@
+# The data the modules on this machine declare, composed by the mesh (novox/hq ADR 0233). Do not edit.
+${backup:data}

go/compose/frombus/testdata/catalogue-c05aa5e6-restic.files/retention.conf

@@ -0,0 +1,6 @@
+# How many restore points the night keeps, written by the mesh from this machine's settings keep-daily,
+# keep-weekly, keep-monthly (novox/hq issue 416) and keep-hand-taken-days (novox/hq issue 453). Replaced on every push; change the settings, never this file.
+daily=${config:keep-daily}
+weekly=${config:keep-weekly}
+monthly=${config:keep-monthly}
+hand=${config:keep-hand-taken-days}

go/compose/frombus/testdata/catalogue-c05aa5e6-restic.module.json

@@ -0,0 +1,199 @@
+{
+  "module": "restic",
+  "version": "1",
+  "moved": true,
+  "claims": [
+    {
+      "name": "node-backup",
+      "scope": "node",
+      "serves": [
+        "backed-up",
+        "now",
+        "restore"
+      ]
+    }
+  ],
+  "emits": [
+    "backed-up"
+  ],
+  "tools": [
+    "backup_health",
+    "backup_delete_retired",
+    "backup_deleted"
+  ],
+  "own-secrets": {
+    "repository": "${dir:state}/repository.secret"
+  },
+  "data": {
+    "own": [
+      {
+        "id": "repository",
+        "path": "${dir:repository}",
+        "class": "rebuildable",
+        "backup": "none",
+        "why": "the restore points themselves: a copy of data kept elsewhere on this machine, never the only copy of anything; lost, the history goes and nothing live does"
+      },
+      {
+        "id": "state",
+        "path": "${dir:state}",
+        "class": "cache",
+        "why": "what the last nights and measurements were; the next night writes it again"
+      }
+    ]
+  },
+    "config": {
+      "keep-daily": {
+        "type": "number",
+        "description": "How many nightly restore points are kept, a count from 1 to 9999: two weeks undo a mistake noticed within a fortnight. Read by the night, which thins nothing while it does not read (novox/hq issue 416); lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone.",
+        "minimum": 1,
+        "maximum": 9999,
+        "trusted": true,
+        "default": 14
+      },
+      "keep-weekly": {
+        "type": "number",
+        "description": "How many weekly restore points are kept behind the dailies, a count from 1 to 9999, refused by the night like keep-daily; lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone.",
+        "minimum": 1,
+        "maximum": 9999,
+        "trusted": true,
+        "default": 8
+      },
+      "keep-monthly": {
+        "type": "number",
+        "description": "How many monthly restore points are kept behind the weeklies, a count from 1 to 9999, refused by the night like keep-daily; lowering it deletes the restore points beyond the new count at the next night, and that cannot be undone.",
+        "minimum": 1,
+        "maximum": 9999,
+        "trusted": true,
+        "default": 6
+      },
+      "keep-hand-taken-days": {
+        "type": "number",
+        "description": "How many days a restore point taken by hand (node-backup.now, or the mesh's before a module moves) is kept at least, a count from 1 to 9999; it is kept until a later good night of its module exists, and this many days in any case, so the next thinning never takes the one taken against a risky change (novox/hq issue 453). Lowering it lets go of the older ones taken by hand at the next thinning, and that cannot be undone.",
+        "minimum": 1,
+        "maximum": 9999,
+        "trusted": true,
+        "default": 7
+      }
+    },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": ".",
+      "unknown": "program"
+    },
+    {
+      "id": "repository",
+      "type": "directory",
+      "mode": "0700",
+      "unknown": "program"
+    },
+    {
+      "id": "declared",
+      "type": "file",
+      "path": "${dir:state}/backups.conf",
+      "mode": "0600",
+      "template": "files/backups.conf"
+    },
+    {
+      "id": "data-declared",
+      "type": "file",
+      "path": "${dir:state}/data.conf",
+      "mode": "0600",
+      "template": "files/data.conf"
+    },
+    {
+      "id": "retention",
+      "type": "file",
+      "path": "${dir:state}/retention.conf",
+      "mode": "0644",
+      "trusted": true,
+      "template": "files/retention.conf"
+    },
+    {
+      "id": "tool",
+      "type": "package",
+      "package": "restic"
+    },
+    {
+      "id": "sqlite",
+      "type": "package",
+      "package": "sqlite"
+    },
+    {
+      "id": "night",
+      "type": "process",
+      "name": "restic-night",
+      "artifact": "tools",
+      "run": [
+        "./restic-backups",
+        "night"
+      ],
+      "user": "${machine:account}",
+      "env": {
+        "MESH_BACKUP_DECLARED": "${dir:state}/backups.conf",
+        "MESH_BACKUP_REPOSITORY": "${dir:repository}",
+        "MESH_BACKUP_PASSWORD_FILE": "${dir:state}/repository.secret",
+        "MESH_BACKUP_STATE": "${dir:state}",
+        "MESH_BACKUP_DATA": "${dir:state}/data.conf"
+      },
+      "health": {
+        "kind": "tool",
+        "tool": "backup_health",
+        "interval": "60s",
+        "timeout": "20s",
+        "looks": 2,
+        "grace": "60s"
+      }
+    },
+    {
+      "id": "measure",
+      "type": "process",
+      "name": "restic-measure",
+      "artifact": "tools",
+      "run": [
+        "./restic-backups",
+        "measure"
+      ],
+      "user": "${machine:account}",
+      "env": {
+        "MESH_BACKUP_DECLARED": "${dir:state}/backups.conf",
+        "MESH_BACKUP_REPOSITORY": "${dir:repository}",
+        "MESH_BACKUP_PASSWORD_FILE": "${dir:state}/repository.secret",
+        "MESH_BACKUP_STATE": "${dir:state}",
+        "MESH_BACKUP_DATA": "${dir:state}/data.conf"
+      },
+      "health": {
+        "kind": "unit"
+      }
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/restic-backups",
+        "binary": "restic-backups",
+        "loads": [
+          "restic-backups"
+        ],
+        "env": {
+          "MESH_BACKUP_DECLARED": "${dir:state}/backups.conf",
+          "MESH_BACKUP_REPOSITORY": "${dir:repository}",
+          "MESH_BACKUP_PASSWORD_FILE": "${dir:state}/repository.secret",
+          "MESH_BACKUP_STATE": "${dir:state}",
+          "MESH_BACKUP_DATA": "${dir:state}/data.conf"
+        }
+      },
+      {
+        "name": "files",
+        "kind": "archive",
+        "from": "files"
+      }
+    ]
+  }
+}

go/compose/frombus/testdata/de-spiegel-e25e1beb.module.json

@@ -0,0 +1,129 @@
+{
+  "module": "de-spiegel",
+  "version": "1",
+  "slug": "spiegel",
+  "capabilities": [
+    "container-runtime"
+  ],
+  "requires": [
+    "route",
+    "smtp"
+  ],
+  "contributes": {
+    "route": {
+      "site": {
+        "label": "de-spiegel",
+        "port": 35621
+      },
+      "praktijk": {
+        "name": "${config:praktijk-name}",
+        "port": 35621
+      },
+      "praktijk-www": {
+        "name": "${config:praktijk-www-name}",
+        "redirect": "https://${config:praktijk-name}"
+      },
+      "psychologie": {
+        "name": "${config:psychologie-name}",
+        "port": 35621
+      },
+      "psychologie-www": {
+        "name": "${config:psychologie-www-name}",
+        "redirect": "https://${config:psychologie-name}"
+      }
+    },
+    "smtp": {
+      "account": "de-spiegel"
+    }
+  },
+  "binds": {
+    "route": "/var/lib/de-spiegel/route.json",
+    "smtp": "/var/lib/de-spiegel/smtp.json"
+  },
+  "config": {
+    "praktijk-name": {
+      "type": "string",
+      "description": "The public name the practice's site is served on; the operator's, with no default (novox/hq ADR 0112).",
+      "trusted": true,
+      "required": true
+    },
+    "praktijk-www-name": {
+      "type": "string",
+      "description": "The public name that redirects to the practice's site (its www form); the operator's, with no default (novox/hq ADR 0112).",
+      "trusted": true,
+      "required": true
+    },
+    "psychologie-name": {
+      "type": "string",
+      "description": "The public name the psychology practice's site is served on; the operator's, with no default (novox/hq ADR 0112).",
+      "trusted": true,
+      "required": true
+    },
+    "psychologie-www-name": {
+      "type": "string",
+      "description": "The public name that redirects to the psychology practice's site (its www form); the operator's, with no default (novox/hq ADR 0112).",
+      "trusted": true,
+      "required": true
+    }
+  },
+  "listens": [
+    {
+      "port": 35621,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "the de-spiegel site and its /contact endpoint over http; the practice's three public names are route grants, and the proxy reaches every one of them here"
+    }
+  ],
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "path": "/var/lib/de-spiegel",
+      "mode": "0700"
+    },
+    {
+      "id": "server-env",
+      "type": "file",
+      "path": "/var/lib/de-spiegel/server.env",
+      "mode": "0600",
+      "content": "SMTP_HOST=${bound:smtp:at}\nSMTP_PORT=${bound:smtp:port}\nSMTP_AUTH_USER=de-spiegel@${bound:smtp:domain}\nSMTP_AUTH_PASS=${secret:smtp}\n"
+    },
+    {
+      "id": "net",
+      "type": "network",
+      "name": "de-spiegel"
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "name": "de-spiegel",
+      "artifact": "site",
+      "network": "de-spiegel",
+      "env-file": [
+        "/var/lib/de-spiegel/server.env"
+      ],
+      "ports": [
+        "35621"
+      ],
+      "secrets-in-environment": "the application's own code reads SMTP_AUTH_USER/PASS from the environment (server/index.js); converting is this repository's change"
+    }
+  ],
+  "build": {
+    "on": [
+      {
+        "arg": "NODE_BASE",
+        "image": "node@sha256:48e4b67d85f87bd551df43704e24d252f56cc5f8e9718841aace50f19948f0f9"
+      }
+    ],
+    "artifacts": [
+      {
+        "name": "site",
+        "kind": "image",
+        "from": "Dockerfile"
+      }
+    ]
+  },
+  "secrets": {
+    "smtp": "/var/lib/de-spiegel/smtp.secret"
+  }
+}

go/compose/frombus/testdata/f1-circuits-c0ea2c94.module.json

@@ -0,0 +1,82 @@
+{
+  "module": "f1-circuits",
+  "slug": "f1",
+  "version": "1",
+  "capabilities": [
+    "container-runtime"
+  ],
+  "requires": [
+    "route"
+  ],
+  "contributes": {
+    "route": {
+      "label": "f1-circuits",
+      "endpoint": "web"
+    }
+  },
+  "binds": {
+    "route": "${dir:state}/route.json"
+  },
+  "listens": [
+    {
+      "name": "web",
+      "port": 8000,
+      "protocol": "tcp",
+      "from": "mesh",
+      "why": "the track-layout CDN, the race posters and the Kometa metadata over http; its public name is a route grant and the proxy reaches it here. Kometa fetches the metadata and every poster by that public name"
+    }
+  ],
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "cache",
+      "type": "directory",
+      "mode": "0700"
+    },
+    {
+      "id": "site-env",
+      "type": "file",
+      "path": "${dir:state}/site.env",
+      "mode": "0644",
+      "content": "F1_CIRCUITS_BASE_URL=https://${bound:route:name}\n"
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "name": "f1-circuits",
+      "artifact": "cdn",
+      "ports": [
+        "8000"
+      ],
+      "env-file": [
+        "${dir:state}/site.env"
+      ],
+      "volumes": [
+        "${dir:cache}:/app/cache"
+      ],
+      "restart-on": [
+        "site-env"
+      ]
+    }
+  ],
+  "build": {
+    "on": [
+      {
+        "arg": "PYTHON_BASE",
+        "image": "python@sha256:6d43704baacd1bfbe7c295d7f13079d5d8104ed33568873133f8fc69980419df"
+      }
+    ],
+    "artifacts": [
+      {
+        "name": "cdn",
+        "kind": "image",
+        "from": "service/Dockerfile"
+      }
+    ]
+  }
+}

go/compose/input.go

@@ -23,6 +23,7 @@ import (
 	"strings"
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
 // Input is everything the composition reads. Each field is what one read of the controller's inventory answers, named
@@ -67,6 +68,10 @@ type Input struct {
 	// OperatorExport is every operator-sealed secret in the mesh, for a module that keeps them (inv.OperatorExport): sealed
 	// values the composition carries without opening. Nil when the mesh has no operator key.
 	OperatorExport *catalogue.KeptExport
+	// KeptRuns is, by node and module, the file of the export as that node runs it (its resource of a module's running
+	// composition): what a node composing its own carries where it holds no OperatorExport (catalogue.Rendering.KeptRuns,
+	// issue 1126, C6). Used only while OperatorExport is nil.
+	KeptRuns map[string]map[string]map[string]any
 
 	// Issued is the credentials made for the consumers of each provider (inv.SecretsFrom): one row for each pair credential
 	// that exists, by the provider node it is for. The grants a provider must create are read from these, so a credential not
@@ -189,6 +194,22 @@ type Node struct {
 	// Contract is the contract of its node-engine's newest statement (inv.HealthOf); Stated is whether it ever stated one.
 	Contract int
 	Stated   bool
+	// InOwn is the modules it runs inside its own composition (`<node>.node`), not by a composition of their own, since
+	// no fingerprint of the new form names them where it runs them (novox/hq issue 1126): Compositions folds their
+	// resources into the node's own, as the controller's composed writer does, unless fps gives one of the new form.
+	// The private network's module (overlay.Name), which nobody builds, is folded whether or not it is named here.
+	InOwn map[string]bool
+	// RunsOwn is the node's own composition (`<node>.node`) as it runs, when the node composes itself: a module folded
+	// there (InOwn) whose manifest names a build (NamesBuild) runs a build of the old form only the controller holds,
+	// so it is left to the node: Compositions composes it as a stub (Stub) and carries its resources as they run, each
+	// after the resource it runs after (issue 1126). Nil composes every folded module from its manifest, as before.
+	RunsOwn *delivery.Composed
+	// Held is the modules refused alone on this node, each composed as what runs of it (Carried, in Kept; its Stub when
+	// nothing of it runs) so the rest is composed (novox/hq issue 1126): none of a held module's own composition is in what
+	// Compositions answers, so the node keeps what it last applied of it; one whose resources the node's own runs
+	// (RunsOwn), folded or leaving the fold, is carried there as it runs, whatever its manifest names, so the node's own
+	// never drops it.
+	Held map[string]bool
 }
 
 // Place is where a node is, as its placement says (inv.Overlay).

go/compose/judge/judge.go

@@ -0,0 +1,243 @@
+// Package judge is how the seat mesh-placement's holder judges a proposal (novox/hq ADR 0567 §3, §4): which nodes must
+// answer it and what it changes on each (Intended), and the verdict of their answers (JudgeAnswers). Moved here from
+// the assigner, where it judged a catalogue pull request's placement (ADR 0559 §5), with a proposal in place of a pull
+// request's change. It holds no bus client and no timer: the holder gives it what it read.
+package judge
+
+import (
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// AnswerBound is how long the holder waits for a node's answer after its candidate was written (ADR 0567 §4): the time to
+// live of the node's pulse key (delivery.PulseAnswerKey), whose expiry names it silent, never passed. A variable so a test
+// on the bus can shorten it.
+var AnswerBound = 10 * time.Minute
+
+// Intended is, by node, the modules whose composition the proposal changes, and the nodes that must answer it (§3).
+// current is the composition input with the current placement and laidInput the same with the proposal's placements
+// (laid, by node; nil removes the node's key) laid over it; nodes is every node to look at (every node with a record).
+// A node's set holds the modules the proposal adds, removes or whose placed entry differs on that node, and those whose
+// composition differs between the two inputs (delivery.CompareComposed), the node's own named "node". Must is every node
+// whose key the proposal changes and every other whose set is not empty, sorted. A node that has no key now gets an
+// empty set (§7: the seed is answered as the same). A node whose compositions cannot be made on either side keeps the
+// modules its entries name, said in notes; such a node is in Must only when its key changes.
+func Intended(current, laidInput *compose.Input, currentPlaced map[string]delivery.Placement, laid map[string]*delivery.Placement,
+	nodes []string, fps map[string]string) (intended map[string]map[string]bool, must []string, notes []string) {
+	intended = map[string]map[string]bool{}
+	inMust := map[string]bool{}
+	all := map[string]bool{}
+	for _, n := range nodes {
+		all[n] = true
+	}
+	for n := range laid {
+		all[n] = true
+		inMust[n] = true
+	}
+	names := make([]string, 0, len(all))
+	for n := range all {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	for _, node := range names {
+		before, placed := currentPlaced[node]
+		set := map[string]bool{}
+		after, changesKey := laid[node]
+		if changesKey && !placed {
+			intended[node] = set // a node new to placement: every answer must be the same
+			continue
+		}
+		if changesKey {
+			var afterModules []delivery.PlacedModule
+			if after != nil {
+				afterModules = after.Modules
+			}
+			entries := map[string]delivery.PlacedModule{}
+			for _, m := range before.Modules {
+				entries[m.Module] = m
+			}
+			seen := map[string]bool{}
+			for _, m := range afterModules {
+				seen[m.Module] = true
+				if e, ok := entries[m.Module]; !ok || !reflect.DeepEqual(e, m) {
+					set[m.Module] = true
+				}
+			}
+			for name := range entries {
+				if !seen[name] {
+					set[name] = true
+				}
+			}
+		}
+		if placed && current != nil && laidInput != nil {
+			was, _, _, errB := compose.CompositionsShadow(*current, node, fps)
+			now, _, _, errA := compose.CompositionsShadow(*laidInput, node, fps)
+			if errA == nil && errB == nil {
+				running := make([]delivery.Composed, 0, len(was))
+				for _, c := range was {
+					running = append(running, c)
+				}
+				cmp := delivery.CompareComposed(now, running)
+				for _, d := range cmp.Differs {
+					set[d.Module] = true
+				}
+				for _, d := range cmp.Added {
+					set[d.Module] = true
+				}
+				for _, m := range cmp.Removed {
+					set[m] = true
+				}
+			} else if changesKey {
+				notes = append(notes, fmt.Sprintf("what the proposal changes on %s is read from its placement alone: its "+
+					"compositions cannot be made (now: %v; proposed: %v)", node, errB, errA))
+			}
+		}
+		if len(set) > 0 {
+			inMust[node] = true
+		}
+		if inMust[node] {
+			intended[node] = set
+		}
+	}
+	for n := range inMust {
+		must = append(must, n)
+	}
+	sort.Strings(must)
+	return intended, must, notes
+}
+
+// JudgeAnswers is the verdict of a proposal's answers (§4). answers is by node its HaveNode.Candidates entry for the
+// proposal (nil when it has none) and revisions by node the revision of its candidate key: an answer counts when it
+// names the proposal and that revision. It fails on a refusal by a node that must answer, and on every node of Must with
+// no answer that counts once its pulse key has ended (pulsing false: the bound's expiry, heard on the bus); while it
+// stands it waits for them.
+// A difference fails nothing: one Intended computed is listed under Intended, one it did not under Unintended, both
+// shown in the ask's brief. The seed alone fails on any difference.
+func JudgeAnswers(p delivery.PlacementProposal, intended map[string]map[string]bool, answers map[string]*delivery.CandidateAnswer,
+	revisions map[string]uint64, online map[string]bool, pulsing map[string]bool, now time.Time) delivery.PlacementVerdict {
+	v := delivery.PlacementVerdict{At: now.UTC(), Intended: map[string][]string{}, Unintended: map[string][]string{},
+		Answers: map[string]delivery.CandidateAnswer{}}
+	for node, set := range intended {
+		for m := range set {
+			v.Intended[node] = append(v.Intended[node], m)
+		}
+		sort.Strings(v.Intended[node])
+	}
+	must := p.Must
+	if len(must) == 0 {
+		must = p.Nodes()
+	}
+	for _, node := range must {
+		a := answers[node]
+		if a == nil || a.Proposal != p.ID || a.Revision == 0 || a.Revision != revisions[node] {
+			v.Silent = append(v.Silent, node)
+			continue
+		}
+		v.Answers[node] = *a
+		if a.Refused != "" {
+			v.Fails = append(v.Fails, fmt.Sprintf("%s cannot compose the proposal: %s", node, a.Refused))
+			continue
+		}
+		for _, r := range a.Refusals {
+			v.Fails = append(v.Fails, fmt.Sprintf("%s refuses the proposal for %s: %s", node, r.Module, r.Why))
+		}
+		want := intended[node]
+		differs := func(module, words string) {
+			if p.Seed {
+				v.Fails = append(v.Fails, fmt.Sprintf("%s %s with the seed, which must be the same as what runs", node, words))
+				return
+			}
+			if !want[module] {
+				v.Unintended[node] = append(v.Unintended[node], module)
+			}
+		}
+		for _, d := range a.Differs {
+			differs(d.Module, fmt.Sprintf("composes %s differently (%s)", d.Module, d.Why))
+		}
+		for _, d := range a.Added {
+			differs(d.Module, "would run "+d.Module)
+		}
+		for _, m := range a.Removed {
+			differs(m, "would stop running "+m)
+		}
+		sort.Strings(v.Unintended[node])
+	}
+	if len(v.Intended) == 0 {
+		v.Intended = nil
+	}
+	if len(v.Unintended) == 0 {
+		v.Unintended = nil
+	}
+	if len(v.Answers) == 0 {
+		v.Answers = nil
+	}
+	var waiting, gone []string
+	for _, node := range v.Silent {
+		named := node
+		if online != nil && !online[node] {
+			named += " (offline)"
+		}
+		if pulsing[node] {
+			waiting = append(waiting, named)
+		} else {
+			gone = append(gone, named)
+		}
+	}
+	if len(waiting) > 0 {
+		v.Notes = append(v.Notes, fmt.Sprintf("waits for the answers of %s, each for %s from its candidate's write",
+			strings.Join(waiting, ", "), AnswerBound))
+	}
+	if len(gone) > 0 {
+		v.Fails = append(v.Fails, fmt.Sprintf("%s did not answer within %s of its candidate's write; judged again when it "+
+			"answers", strings.Join(gone, ", "), AnswerBound))
+	}
+	switch {
+	case len(v.Fails) > 0:
+		v.State = delivery.VerdictFail
+	case len(waiting) > 0:
+		v.State = delivery.VerdictWaits
+	default:
+		v.State = delivery.VerdictPass
+	}
+	return v
+}
+
+// Brief is the verdict as the ask's brief shows it, by node (§5): what the proposal changes and what each node answered
+// beside it, marked, with the proposal's why.
+func Brief(p delivery.PlacementProposal, v delivery.PlacementVerdict) string {
+	var b strings.Builder
+	fmt.Fprintf(&b, "%s (proposed by %s)", p.Why, p.By)
+	nodes := map[string]bool{}
+	for n := range v.Intended {
+		nodes[n] = true
+	}
+	for n := range v.Unintended {
+		nodes[n] = true
+	}
+	for _, n := range p.Nodes() {
+		nodes[n] = true
+	}
+	names := make([]string, 0, len(nodes))
+	for n := range nodes {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	for _, n := range names {
+		fmt.Fprintf(&b, "; %s:", n)
+		if m := v.Intended[n]; len(m) > 0 {
+			fmt.Fprintf(&b, " changes %s", strings.Join(m, ", "))
+		} else {
+			b.WriteString(" composes the same")
+		}
+		if m := v.Unintended[n]; len(m) > 0 {
+			fmt.Fprintf(&b, "; also differs, not computed: %s", strings.Join(m, ", "))
+		}
+	}
+	return b.String()
+}

go/compose/judge/judge_test.go

@@ -0,0 +1,68 @@
+package judge
+
+import (
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// ADR 0567 §3, §4 (rows moved from the assigner's check of a pull request's placement, ADR 0559 §5): what a proposal
+// changes by node, and the verdict of the answers: differences shown and failing nothing, a refusal and a silent node
+// failing, a later answer judging again, the seed failing on any difference.
+func TestJudge(t *testing.T) {
+	current := map[string]delivery.Placement{"anchor": {Node: "anchor", Modules: []delivery.PlacedModule{{Module: "mail"}}}, "server": {Node: "server"}}
+	laid := map[string]*delivery.Placement{
+		"anchor": {Node: "anchor", Modules: []delivery.PlacedModule{{Module: "mail", Ports: map[string]int{"25": 2525}}, {Module: "web"}}},
+		"laptop": {Node: "laptop", Modules: []delivery.PlacedModule{{Module: "web"}}}}
+	got, must, _ := Intended(nil, nil, current, laid, []string{"anchor", "laptop", "server"}, nil)
+	if !got["anchor"]["mail"] || !got["anchor"]["web"] || len(got["laptop"]) != 0 || !slices.Equal(must, []string{"anchor", "laptop"}) {
+		t.Errorf("intended = %v, must %v: want anchor's mail and web, nothing on the laptop that has no key, server untouched", got, must)
+	}
+
+	at := time.Date(2026, 10, 27, 2, 0, 0, 0, time.UTC)
+	p := delivery.PlacementProposal{ID: "p-one", By: "op", Why: "move web", Written: at, Base: map[string]uint64{"anchor": 3, "laptop": 0},
+		Must: []string{"anchor", "laptop"}}
+	revisions := map[string]uint64{"anchor": 7, "laptop": 8}
+	intended := map[string]map[string]bool{"anchor": {"web": true}}
+	same := func(rev uint64) *delivery.CandidateAnswer {
+		return &delivery.CandidateAnswer{Proposal: "p-one", Revision: rev, Verdict: delivery.CandidateSame, Same: []string{"mail"}}
+	}
+	differs := func(rev uint64, module string) *delivery.CandidateAnswer {
+		return &delivery.CandidateAnswer{Proposal: "p-one", Revision: rev, Verdict: delivery.CandidateDiffers,
+			Differs: []delivery.ModuleDiffers{{Module: module, Why: "the port differs"}}}
+	}
+	for _, row := range []struct {
+		name    string
+		seed    bool
+		answers map[string]*delivery.CandidateAnswer
+		pulsing map[string]bool
+		state   string
+		words   string
+		marked  string
+	}{
+		{"all the same", false, map[string]*delivery.CandidateAnswer{"anchor": same(7), "laptop": same(8)}, nil, delivery.VerdictPass, "", ""},
+		{"a module added where intended", false, map[string]*delivery.CandidateAnswer{"anchor": {Proposal: "p-one", Revision: 7, Verdict: delivery.CandidateDiffers,
+			Added: []delivery.ModuleAdded{{Module: "web", Unissued: []string{"its own secret"}}}}, "laptop": same(8)}, nil, delivery.VerdictPass, "", ""},
+		{"a difference not computed passes, marked", false, map[string]*delivery.CandidateAnswer{"anchor": differs(7, "mail"), "laptop": same(8)}, nil, delivery.VerdictPass, "", "mail"},
+		{"the seed with a difference", true, map[string]*delivery.CandidateAnswer{"anchor": same(7), "laptop": differs(8, "web")}, nil, delivery.VerdictFail, "laptop composes web differently", ""},
+		{"a refusal", false, map[string]*delivery.CandidateAnswer{"anchor": same(7), "laptop": {Proposal: "p-one", Revision: 8, Verdict: delivery.CandidateRefused,
+			Refusals: []delivery.ModuleRefused{{Module: "web", Why: "no own secret"}}}}, nil, delivery.VerdictFail, "laptop refuses", ""},
+		{"a node not answering, within its bound", false, map[string]*delivery.CandidateAnswer{"anchor": same(7)}, map[string]bool{"laptop": true}, delivery.VerdictWaits, "laptop (offline)", ""},
+		{"an answer of an earlier revision, past its bound", false, map[string]*delivery.CandidateAnswer{"anchor": same(6), "laptop": same(8)}, nil, delivery.VerdictFail, "anchor did not answer", ""},
+		{"its later answer", false, map[string]*delivery.CandidateAnswer{"anchor": same(7), "laptop": same(8)}, nil, delivery.VerdictPass, "", ""},
+	} {
+		q := p
+		q.Seed = row.seed
+		v := JudgeAnswers(q, intended, row.answers, revisions, map[string]bool{"anchor": true}, row.pulsing, at)
+		all := strings.Join(append(append([]string{}, v.Fails...), v.Notes...), "; ")
+		if v.State != row.state || !strings.Contains(all, row.words) {
+			t.Errorf("%s: %s, %q", row.name, v.State, all)
+		}
+		if row.marked != "" && (!slices.Contains(v.Unintended["anchor"], row.marked) || !strings.Contains(Brief(q, v), "not computed: "+row.marked)) {
+			t.Errorf("%s: the difference is not marked: %+v, %s", row.name, v.Unintended, Brief(q, v))
+		}
+	}
+}

go/compose/network.go

@@ -24,6 +24,9 @@ type composer struct {
 	in   Input
 	said []string
 	seen map[string]bool
+	// unhostable is, from the last look at the rest of the mesh, each module assigned to another node that this
+	// composition finds that node cannot run: what it would have offered is missing here (issue 1126, probe #532).
+	unhostable []string
 }
 
 func newComposer(in Input) *composer { return &composer{in: in, seen: map[string]bool{}} }

go/compose/rendering.go

@@ -128,6 +128,9 @@ func (c *composer) places(nodeName string, resolved Resolved) (Placed, error) {
 			continue
 		}
 		r.Kept = c.in.OperatorExport
+		if r.Kept == nil {
+			r.KeptRuns = c.in.KeptRuns[node.Name]
+		}
 		break
 	}
 
@@ -325,6 +328,13 @@ func (c *composer) artifactStoreOnNetwork(on map[string]bool) (node, port string
 	return "", "", false, nil
 }
 
+// ArtifactStoreAddress is the artifact store as node reaches it, by the rule its composition routes every kept reference
+// with (artifactStoreAddress): empty when node reaches none. A node composing its own modules reads a templates archive
+// there (issue 1126).
+func ArtifactStoreAddress(in Input, node string) (string, error) {
+	return newComposer(in).artifactStoreAddress(node)
+}
+
 // artifactStoreAddress is the artifact store as `forNode` reaches it: `<node>.internal:<port>` over the private network, or
 // `127.0.0.1:<port>` for the node that holds the store itself when nothing is on the network yet, and empty for any other
 // (novox/hq 04-ISSUES/102).

go/compose/resolve.go

@@ -3,6 +3,7 @@ package compose
 import (
 	"fmt"
 	"slices"
+	"strings"
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 )
@@ -203,7 +204,7 @@ func (c *composer) resolution(nodeName string) (catalogue.Resolution, error) {
 		return catalogue.Resolution{}, err
 	}
 	shelf := c.shelfFor(node)
-	world, _, _, err := c.theRestOfTheMesh(nodeName)
+	world, _, left, err := c.theRestOfTheMesh(nodeName)
 	if err != nil {
 		return catalogue.Resolution{}, err
 	}
@@ -226,6 +227,19 @@ func (c *composer) resolution(nodeName string) (catalogue.Resolution, error) {
 			Account: node.Account, AccountHome: node.AccountHome,
 			AgentAccount: node.AgentAccount, AgentAccountHome: node.AgentAccountHome}, world)
 	if err != nil {
+		// What another node's set would have offered is missing when that set does not resolve here: said with the
+		// refusal, so "nothing provides" is read beside why (issue 1126, probe #532).
+		if len(left) > 0 {
+			var why []string
+			for _, l := range left {
+				why = append(why, l.String())
+			}
+			err = fmt.Errorf("%w\n\nand %d node(s) offer nothing here, as they could not be resolved: %s", err, len(left), strings.Join(why, "; "))
+		}
+		if len(c.unhostable) > 0 {
+			err = fmt.Errorf("%w\n\nand these modules offer nothing here, as their node cannot run them in this composition: %s",
+				err, strings.Join(c.unhostable, "; "))
+		}
 		// The node's own set does not compose: the only failure a mesh-wide gatherer may pass over.
 		return catalogue.Resolution{}, notResolvable{err}
 	}

go/compose/rest.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"sort"
+	"strings"
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 )
@@ -100,6 +101,7 @@ func (c *composer) theRestOfTheMesh(exclude string) (catalogue.World, Passes, []
 	var left []LeftOut
 	offered := map[string][]catalogue.Provider{}
 	var firstHeld []catalogue.Held
+	c.unhostable = nil
 	for _, o := range others {
 		got, err := catalogue.Resolve(shelf, o.assigned, o.node, catalogue.World{Unchecked: true, Holdings: holdings})
 		if err != nil {
@@ -107,6 +109,9 @@ func (c *composer) theRestOfTheMesh(exclude string) (catalogue.World, Passes, []
 			left = append(left, LeftOut{Node: o.node.Name, Err: err})
 			continue
 		}
+		for _, u := range got.Unhostable {
+			c.unhostable = append(c.unhostable, fmt.Sprintf("%s on %s lacks %s", u.Module, o.node.Name, strings.Join(u.Missing, ", ")))
+		}
 		firstHeld = append(firstHeld, got.Claims...)
 		for _, m := range got.Modules {
 			for _, name := range m.OffersAt(catalogue.ScopeMesh) {

go/composer/composer.go

@@ -17,6 +17,8 @@ import (
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/compose/frombus"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 	"git.novox.be/novox/mesh-sdk/go/sdkversion"
 )
 
@@ -64,10 +66,15 @@ type Request struct {
 }
 
 // Case is one catalogue composed: every module's manifest by name, and per node the manifests kept at the build it runs.
+//
+// Placements are, by node, the placement the case composes that node with in place of what Input says of it: a change's
+// own placement files, so a check composes a catalogue pull request's placement (issue 1126, frombus.Placed); a null
+// placement leaves nothing placed on the node. A case without them composes Input's.
 type Case struct {
-	Name      string                         `json:"name"`
-	Manifests map[string]Manifest            `json:"manifests"`
-	Kept      map[string]map[string]Manifest `json:"kept,omitempty"`
+	Name       string                         `json:"name"`
+	Manifests  map[string]Manifest            `json:"manifests"`
+	Kept       map[string]map[string]Manifest `json:"kept,omitempty"`
+	Placements map[string]*delivery.Placement `json:"placements,omitempty"`
 }
 
 // Manifest is a module's manifest as its repository holds it (Raw, the bytes), or the digest the delivery indexer keeps
@@ -251,7 +258,10 @@ func runCase(r Request, c Case, depth string) (CaseVerdict, error) {
 	if err != nil {
 		return CaseVerdict{}, err
 	}
-	in := r.Input
+	in, err := frombus.Placed(r.Input, c.Placements)
+	if err != nil {
+		return CaseVerdict{}, fmt.Errorf("composer: the case %q: %w", c.Name, err)
+	}
 	in.Catalogue = shelf
 	in.Nodes = slices.Clone(in.Nodes)
 	in.Holdings = slices.Clone(in.Holdings)

go/composer/composer_test.go

@@ -10,6 +10,7 @@ import (
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"git.novox.be/novox/mesh-sdk/go/compose"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
 const demo = `{"module": "demo", "version": "1", "claims": [{"name": "node-files"}]}`
@@ -100,6 +101,19 @@ func TestARequestItCannotRunIsRefused(t *testing.T) {
 	if _, err := Run(Request{V: Version, Depth: "deep"}); err == nil {
 		t.Error("an unknown depth runs")
 	}
+	// A case's own placement (issue 1126) composes over a node the input holds, and is refused for one it does not.
+	placed := Request{V: Version, Input: compose.Input{Nodes: []compose.Node{{Name: "a"}}}, Machines: []string{"a"}, Depth: DepthResolve,
+		Cases: []Case{{Name: "trunk", Manifests: map[string]Manifest{"demo": {Raw: json.RawMessage(demo)}}},
+			{Name: "change", Manifests: map[string]Manifest{"demo": {Raw: json.RawMessage(demo)}},
+				Placements: map[string]*delivery.Placement{"a": {Node: "a", Modules: []delivery.PlacedModule{{Module: "ghost"}}}}}}}
+	if v, err := Run(placed); err != nil || !v.Cases[0].Machines["a"].Composes || v.Cases[1].Machines["a"].Composes ||
+		!strings.Contains(v.Cases[1].Machines["a"].Reason, "ghost") {
+		t.Errorf("a case composes its own placement: %+v, %v", v, err)
+	}
+	placed.Cases[1].Placements = map[string]*delivery.Placement{"z": {Node: "z"}}
+	if _, err := Run(placed); err == nil || !strings.Contains(err.Error(), "holds no node for") {
+		t.Errorf("a case placing a node the input lacks: %v", err)
+	}
 	v, err := Run(Request{V: Version, Cases: []Case{{Name: "only-read", Manifests: map[string]Manifest{"demo": {Raw: json.RawMessage(demo)}}}}})
 	if err != nil || len(v.Cases) != 1 || !v.Cases[0].Manifests["demo"].Accepted || v.Cases[0].Machines != nil || v.SDK == "" {
 		t.Fatalf("a request with no machines: %+v, %v", v, err)

go/delivery/answer_paths.go

@@ -0,0 +1,177 @@
+package delivery
+
+import (
+	"bytes"
+	"encoding/json"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// DifferingPaths is every JSON path at which two bodies of one resource differ, sorted (issue 1126, T1: the shadow
+// shows its work): object keys and list places joined by dots (`content.url`, `links.0`), a string that holds a JSON
+// object or list read as that JSON and walked on (a runtime's config carried as text), a key or place one side alone
+// holds named as it is. A key a secret could be under (secretWords) is named and not walked into. A body that is not
+// JSON differs at "" (the whole), and a resource one side alone holds has none. At most MaxPaths: the last then says how many more there are. A path names keys
+// alone, never a value, so it holds no secret.
+func DifferingPaths(composed, running json.RawMessage) []string {
+	if composed == nil || running == nil {
+		return nil // one side alone holds it: its why says so
+	}
+	var a, b any
+	okA := unmarshalNumbers(composed, &a) == nil
+	okB := unmarshalNumbers(running, &b) == nil
+	if !okA || !okB {
+		if bytes.Equal(composed, running) {
+			return nil
+		}
+		return []string{""}
+	}
+	var out []string
+	walkDiffering(a, b, "", &out)
+	sort.Strings(out)
+	if len(out) > MaxPaths {
+		more := len(out) - (MaxPaths - 1)
+		out = append(out[:MaxPaths-1], "… "+strconv.Itoa(more)+" more")
+	}
+	return out
+}
+
+func unmarshalNumbers(raw []byte, into *any) error {
+	d := json.NewDecoder(bytes.NewReader(raw))
+	d.UseNumber()
+	return d.Decode(into)
+}
+
+// asJSON is a string holding a JSON object or list read as that value; v itself otherwise.
+func asJSON(v any) any {
+	s, ok := v.(string)
+	if !ok {
+		return v
+	}
+	t := strings.TrimSpace(s)
+	if t == "" || (t[0] != '{' && t[0] != '[') {
+		return v
+	}
+	var parsed any
+	if unmarshalNumbers([]byte(t), &parsed) != nil {
+		return v
+	}
+	return parsed
+}
+
+func join(at, key string) string {
+	if at == "" {
+		return key
+	}
+	return at + "." + key
+}
+
+func walkDiffering(a, b any, at string, out *[]string) {
+	a, b = asJSON(a), asJSON(b)
+	ma, isMA := a.(map[string]any)
+	mb, isMB := b.(map[string]any)
+	if isMA && isMB {
+		keys := map[string]bool{}
+		for k := range ma {
+			keys[k] = true
+		}
+		for k := range mb {
+			keys[k] = true
+		}
+		for k := range keys {
+			x, inA := ma[k]
+			y, inB := mb[k]
+			switch {
+			case !inA || !inB:
+				*out = append(*out, join(at, k))
+			case secretKey(k):
+				// A file's secrets (SecretsField) are named entry by entry, each entry never entered; any other
+				// object under a secret key, a vault box included, is one path.
+				sx, isSX := x.(map[string]any)
+				sy, isSY := y.(map[string]any)
+				if k != SecretsField || !isSX || !isSY {
+					if !sameAny(x, y) {
+						*out = append(*out, join(at, k))
+					}
+					continue
+				}
+				for name := range sx {
+					if v, in := sy[name]; !in || !sameAny(sx[name], v) {
+						*out = append(*out, join(join(at, k), name))
+					}
+				}
+				for name := range sy {
+					if _, in := sx[name]; !in {
+						*out = append(*out, join(join(at, k), name))
+					}
+				}
+			default:
+				walkDiffering(x, y, join(at, k), out)
+			}
+		}
+		return
+	}
+	la, isLA := a.([]any)
+	lb, isLB := b.([]any)
+	if isLA && isLB {
+		for i := range max(len(la), len(lb)) {
+			if i >= len(la) || i >= len(lb) {
+				*out = append(*out, join(at, strconv.Itoa(i)))
+				continue
+			}
+			walkDiffering(la[i], lb[i], join(at, strconv.Itoa(i)), out)
+		}
+		return
+	}
+	if !sameAny(a, b) {
+		*out = append(*out, at)
+	}
+}
+
+func sameAny(a, b any) bool {
+	x, errA := json.Marshal(a)
+	y, errB := json.Marshal(b)
+	return errA == nil && errB == nil && bytes.Equal(x, y)
+}
+
+// FitAnswer is a with its shown bodies cut until its JSON is within limit bytes (MaxAnswerBytes for the node's key):
+// first the bodies' texts, from the last differing module back, keeping their paths; then the paths too. What is cut
+// is said in the answer's note. The verdict and every list of modules are never cut.
+func FitAnswer(a CandidateAnswer, limit int) CandidateAnswer {
+	size := func() int {
+		raw, err := json.Marshal(a)
+		if err != nil {
+			return 0
+		}
+		return len(raw)
+	}
+	if size() <= limit {
+		return a
+	}
+	a.Differs = append([]ModuleDiffers(nil), a.Differs...)
+	for i := range a.Differs {
+		a.Differs[i].Bodies = append([]ResourceBodies(nil), a.Differs[i].Bodies...)
+	}
+	cutTexts, cutPaths := false, false
+	for i := len(a.Differs) - 1; i >= 0 && size() > limit; i-- {
+		for j := range a.Differs[i].Bodies {
+			a.Differs[i].Bodies[j].Composed, a.Differs[i].Bodies[j].Running = "", ""
+		}
+		cutTexts = true
+	}
+	for i := len(a.Differs) - 1; i >= 0 && size() > limit; i-- {
+		for j := range a.Differs[i].Bodies {
+			a.Differs[i].Bodies[j].Paths = nil
+		}
+		cutPaths = true
+	}
+	why := "the bodies shown were cut to keep the answer within " + strconv.Itoa(limit>>10) + " KiB"
+	if cutPaths {
+		why += ", their paths too"
+	}
+	if cutTexts {
+		a.Note = strings.TrimPrefix(a.Note+"; ", "; ") + why
+	}
+	return a
+}

go/delivery/assigner.go

@@ -452,6 +452,12 @@ func ParseCompositionKey(key string) (group, headsHash string, err error) {
 	return group, headsHash, nil
 }
 
+// CompositionUnanswered is the Words of a composition that failed only because a node placed at the head or on the
+// trunk did not answer the group's placement candidate within its bound (novox/hq ADR 0559 §5): the checker takes a
+// later passing composition of the same heads in without a new check, since the failure was a part of the mesh not
+// heard, not the change (ADR 0548 §1).
+const CompositionUnanswered = "did not answer the placement candidate within its bound; judged again when it answers"
+
 // CompositionVerdict is the value of a composition key: the group and its heads hash, the State (pass, fail or waits),
 // the Words of a refusal or of what it waits for, the mesh-sdk commit it composed with (the assigner's own, or the
 // group's mesh-sdk member's head, ADR 0482 clause 3), the machines composed, the first machine that failed, the

go/delivery/buildrun/places.go

@@ -4,38 +4,12 @@ import (
 	"context"
 	"fmt"
 	"sort"
-	"strconv"
-	"strings"
 	"sync"
 )
 
 // DefaultCapacity is the build capacity of a node that has no setting: one build step at a time.
 const DefaultCapacity = 1
 
-// ParseCapacity reads a capacity setting: `node=steps` pairs separated by commas, such as
-// `shanks=3,ace=2`. A node without a pair has DefaultCapacity. A pair with no node, a count that is not a whole number of
-// at least 0, and a node named twice are refused. A count of 0 keeps the part off the node: it is never chosen.
-func ParseCapacity(s string) (map[string]int, error) {
-	out := map[string]int{}
-	for _, pair := range strings.Split(s, ",") {
-		pair = strings.TrimSpace(pair)
-		if pair == "" {
-			continue
-		}
-		node, count, ok := strings.Cut(pair, "=")
-		node, count = strings.TrimSpace(node), strings.TrimSpace(count)
-		n, err := strconv.Atoi(count)
-		if !ok || node == "" || err != nil || n < 0 {
-			return nil, fmt.Errorf("the capacity %q is not <node>=<steps at once, 0 or more>", pair)
-		}
-		if _, dup := out[node]; dup {
-			return nil, fmt.Errorf("the capacity names %s twice", node)
-		}
-		out[node] = n
-	}
-	return out, nil
-}
-
 // Places counts the build steps a part runs on each node and holds a lane back while its node is at its
 // capacity (the operator's decision of 2026-10-21; ADR 0478 clause 3). A lane is the fetch and the builds of one build
 // module on one node, run one step at a time, so a lane holds one place while it runs. A node is chosen for a lane by

go/delivery/buildrun/places_test.go

@@ -7,21 +7,6 @@ import (
 	"time"
 )
 
-func TestParseCapacityReadsNodeEqualsCountPairs(t *testing.T) {
-	c, err := ParseCapacity(" shanks=3, ace=2 ")
-	if err != nil || c["shanks"] != 3 || c["ace"] != 2 || len(c) != 2 {
-		t.Errorf("capacity = %v, %v", c, err)
-	}
-	if c, err := ParseCapacity(""); err != nil || len(c) != 0 {
-		t.Errorf("empty: %v, %v", c, err)
-	}
-	for _, bad := range []string{"shanks", "shanks=x", "=2", "a=1,a=2", "shanks=-1"} {
-		if _, err := ParseCapacity(bad); err == nil {
-			t.Errorf("%q accepted", bad)
-		}
-	}
-}
-
 func acquireAsync(p *Places, node string) chan func() {
 	got := make(chan func(), 1)
 	go func() {
@@ -95,17 +80,10 @@ func TestAWaitingStepStopsWhenItsContextEnds(t *testing.T) { // round 3
 
 // The operator's decision of 2026-10-21 13:40: the builder builds on shanks and ace only; a capacity of 0 keeps it off a node.
 func TestACapacityOfZeroKeepsThePartOffTheNodeAndANodeNotNamedKeepsOne(t *testing.T) { // issue 1661
-	c, err := ParseCapacity("shanks=3,ace=2,g14=0,novox=0")
-	if err != nil || c["g14"] != 0 || c["novox"] != 0 || c["shanks"] != 3 || len(c) != 4 {
-		t.Fatalf("capacity = %v, %v", c, err)
-	}
-	p := &Places{Capacity: c}
+	p := &Places{Capacity: map[string]int{"shanks": 3, "ace": 2, "g14": 0, "novox": 0}}
 	if p.CapacityOf("g14") != 0 || p.CapacityOf("novox") != 0 || p.CapacityOf("ace") != 2 || p.CapacityOf("other") != DefaultCapacity {
 		t.Errorf("capacities = %d %d %d %d, want 0 0 2 and the default for a node not named", p.CapacityOf("g14"), p.CapacityOf("novox"), p.CapacityOf("ace"), p.CapacityOf("other"))
 	}
-	if _, err := ParseCapacity("shanks=-1"); err == nil {
-		t.Error("a negative capacity accepted")
-	}
 	entries := tcs("go", "go1.27.1", "ace", "g14", "novox", "shanks", "other")
 	for i := 0; i < 6; i++ {
 		nodes, _, err := ChooseNodes("go", entries, p, nil, 2)
@@ -119,7 +97,7 @@ func TestACapacityOfZeroKeepsThePartOffTheNodeAndANodeNotNamedKeepsOne(t *testin
 		}
 	}
 	// Only nodes of capacity 0 report: nothing qualifies, and the build says why.
-	_, _, err = ChooseNodes("go", tcs("go", "go1.27.1", "g14", "novox"), p, nil, 2)
+	_, _, err := ChooseNodes("go", tcs("go", "go1.27.1", "g14", "novox"), p, nil, 2)
 	if err == nil || !strings.Contains(err.Error(), "capacity") {
 		t.Errorf("only capacity-0 nodes: error = %v, want it to name the capacity", err)
 	}

go/delivery/composed_compare.go

@@ -0,0 +1,387 @@
+package delivery
+
+import (
+	"bytes"
+	"encoding/json"
+	"strconv"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
+)
+
+// Comparison is what CompareComposed finds, module by module: the same, differing, added by what was composed (not run
+// now) and removed by it (run now, not composed). Each list is sorted by module.
+type Comparison struct {
+	Same    []string
+	Differs []ModuleDiffers
+	Added   []ModuleAdded
+	Removed []string
+}
+
+// CompareComposed compares the compositions a node composed (by key, as compose.Compositions answers them) with the ones
+// it runs, as its agent would (ADR 0559 §4: a node's answer to a placement candidate). A module is the same when its
+// composition's digest is the one it runs (ComposedDigestOf, the signature left out), so the agent would apply nothing
+// of it; it differs when the digests differ (both named); it is added when composed and not run, removed when run and
+// not composed. The node's own composition is named HaveNodeWord. The bus's user list (catalogue.BusUsersID) is left out
+// on both sides: the bus node follows it alone and never applies it from a composition it made (ADR 0547 §2, §8). A
+// difference names the first resource, by its id, whose content differs or that one side alone holds; when every
+// resource is equal it says what else differs (their order, the files filled, the data, the node's own parts, a file
+// carried by digest).
+func CompareComposed(composed map[string]Composed, running []Composed) Comparison {
+	return CompareComposedWith(composed, running, nil)
+}
+
+// CompareComposedWith is CompareComposed showing, for each module that differs, every differing resource with both
+// bodies masked (MaskedPair); sameValue, when given, says whether two sealed values open to the same value (the node
+// opens them with its own key), so a value sealed again reads as such.
+func CompareComposedWith(composed map[string]Composed, running []Composed, sameValue func(a, b string) (same, known bool)) Comparison {
+	name := func(c Composed) string {
+		if c.Module == "" {
+			return HaveNodeWord
+		}
+		return c.Module
+	}
+	ours := map[string]Composed{}
+	for _, c := range composed {
+		ours[name(c)] = c
+	}
+	theirs := map[string]Composed{}
+	for _, c := range running {
+		theirs[name(c)] = c
+	}
+	modules := map[string]bool{}
+	for m := range ours {
+		modules[m] = true
+	}
+	for m := range theirs {
+		modules[m] = true
+	}
+	var out Comparison
+	for _, m := range sortedKeys(modules) {
+		a, composedHere := ours[m]
+		b, runs := theirs[m]
+		switch {
+		case !runs:
+			dig, _ := ComposedDigestOf(withoutBusUsers(a))
+			out.Added = append(out.Added, ModuleAdded{Module: m, Composed: dig})
+		case !composedHere:
+			out.Removed = append(out.Removed, m)
+		default:
+			if d, ok := compareOne(m, a, b, sameValue); ok {
+				out.Same = append(out.Same, m)
+			} else {
+				out.Differs = append(out.Differs, d)
+			}
+		}
+	}
+	return out
+}
+
+// compareOne is one module's comparison: true when the digests agree, else what differs first.
+func compareOne(module string, composed, running Composed, sameValue func(a, b string) (bool, bool)) (ModuleDiffers, bool) {
+	composed, running = withoutBusUsers(composed), withoutBusUsers(running)
+	// A sealed value is judged by the value it opens to, slot by slot (issue 1126, C1): a value sealed again at the same
+	// field of the same resource is the box that runs, never a difference; and a box is never matched across resources.
+	composed = KeepSeals(composed, SealsIn(running), sameValue)
+	dc, errC := ComposedDigestOf(composed)
+	dr, errR := ComposedDigestOf(running)
+	if errC != nil {
+		return ModuleDiffers{Module: module, Running: dr, Why: "the composition has no digest: " + errC.Error()}, false
+	}
+	if errR == nil && dc == dr {
+		return ModuleDiffers{}, true
+	}
+	differs := func(resource, why string) (ModuleDiffers, bool) {
+		return ModuleDiffers{Module: module, Composed: dc, Running: dr, Resource: resource, Why: why}, false
+	}
+	// Words for the difference: resource by resource, each side with its large files by digest, so a file carried whole
+	// and the same file carried by digest read as one.
+	a, _, errA := composed.ByDigest()
+	b, _, errB := running.ByDigest()
+	if errA != nil || errB != nil {
+		return differs("", "the compositions differ and cannot be read resource by resource")
+	}
+	ra, rb := resourcesByID(a.Resources), resourcesByID(b.Resources)
+	ids := map[string]bool{}
+	for id := range ra {
+		ids[id] = true
+	}
+	for id := range rb {
+		ids[id] = true
+	}
+	var first ModuleDiffers
+	found := false
+	var bodies []ResourceBodies
+	for _, id := range sortedKeys(ids) {
+		x, inA := ra[id]
+		y, inB := rb[id]
+		why := ""
+		switch {
+		case !inB:
+			why = "composed, and not in what runs"
+		case !inA:
+			why = "in what runs, and not composed"
+		case !bytes.Equal(x, y):
+			why = "the resource differs"
+		default:
+			continue
+		}
+		if !found {
+			first, _ = differs(id, why)
+			found = true
+		}
+		if len(bodies) < MaxBodies {
+			// The paths are found on the whole bodies, before either is cut (issue 1126, T1: three resources over
+			// MaxBody could not be told apart).
+			c, r := MaskedPair(x, y, sameValue)
+			bodies = append(bodies, ResourceBodies{ID: id, Why: why, Paths: DifferingPaths(x, y),
+				Composed: cut(c), Running: cut(r)})
+		}
+	}
+	if found {
+		first.Bodies = bodies
+		return first, false
+	}
+	switch {
+	case !jsonEqual(a.Filled, b.Filled):
+		return differs("", "the files the provisioner fills differ")
+	case a.Data != b.Data:
+		return differs("", "whether it declares data differs")
+	case !jsonEqual(a.Own, b.Own):
+		return differs("", "the node's own parts differ")
+	case a.FP != b.FP:
+		return differs("", "the fingerprint differs")
+	}
+	if dA, err := ComposedDigestOf(a); err == nil {
+		if dB, err := ComposedDigestOf(b); err == nil && dA == dB {
+			return differs("", "the same content, a large file carried whole on one side and by digest on the other")
+		}
+	}
+	return differs("", "the same resources in another order")
+}
+
+// withoutBusUsers is c without the bus's user list resource (its id `bus-users`, or `<module>.bus-users`).
+func withoutBusUsers(c Composed) Composed {
+	out := c
+	out.Resources = nil
+	for _, raw := range c.Resources {
+		var head struct {
+			ID string `json:"id"`
+		}
+		if json.Unmarshal(raw, &head) == nil && (head.ID == catalogue.BusUsersID() || strings.HasSuffix(head.ID, "."+catalogue.BusUsersID())) {
+			continue
+		}
+		out.Resources = append(out.Resources, raw)
+	}
+	return out
+}
+
+// resourcesByID is each resource canonical, by its id (a resource without one by its place).
+func resourcesByID(resources []json.RawMessage) map[string][]byte {
+	out := make(map[string][]byte, len(resources))
+	for i, raw := range resources {
+		var head struct {
+			ID string `json:"id"`
+		}
+		_ = json.Unmarshal(raw, &head)
+		id := head.ID
+		if id == "" {
+			id = "#" + strconv.Itoa(i)
+		}
+		canon, err := canonicalJSON(raw)
+		if err != nil {
+			canon = raw
+		}
+		out[id] = canon
+	}
+	return out
+}
+
+// cut is s cut at MaxBody bytes, saying so.
+func cut(s string) string {
+	if len(s) <= MaxBody {
+		return s
+	}
+	return s[:MaxBody] + "… (cut at " + strconv.Itoa(MaxBody) + " bytes)"
+}
+
+// secretWords are the words of a key whose value may hold a secret or a sealed one: masked in a shown body.
+var secretWords = []string{"sealed", "secret", "password", "passwd", "token", "private", "key", "credential", "jwt", "salt", "hash"}
+
+func secretKey(k string) bool {
+	k = strings.ToLower(k)
+	for _, w := range secretWords {
+		if strings.Contains(k, w) {
+			return true
+		}
+	}
+	return false
+}
+
+// MaskedPair is two bodies of one resource (either may be nil) as JSON text with every value under a key a secret could
+// be in (secretWords, at any depth) masked: "<masked: the same on both sides>", "<masked: another seal of the same
+// value>" or "<masked: another value>" when sameValue says so, "<masked: differs>" otherwise, "<masked>" on one side
+// alone. A body that is not JSON is shown as its length only.
+func MaskedPair(composed, running json.RawMessage, sameValue func(a, b string) (same, known bool)) (string, string) {
+	var a, b any
+	okA := composed != nil && json.Unmarshal(composed, &a) == nil
+	okB := running != nil && json.Unmarshal(running, &b) == nil
+	if okA && okB {
+		a, b = maskBoth(a, b, sameValue)
+	} else if okA {
+		a, _ = maskBoth(a, nil, nil)
+	} else if okB {
+		_, b = maskBoth(nil, b, nil)
+	}
+	show := func(v any, raw json.RawMessage, ok bool) string {
+		if raw == nil {
+			return ""
+		}
+		if !ok {
+			return "<not JSON: " + strconv.Itoa(len(raw)) + " bytes>"
+		}
+		var out bytes.Buffer
+		enc := json.NewEncoder(&out)
+		enc.SetEscapeHTML(false)
+		_ = enc.Encode(v)
+		return strings.TrimSuffix(out.String(), "\n")
+	}
+	return show(a, composed, okA), show(b, running, okB)
+}
+
+func maskBoth(a, b any, sameValue func(a, b string) (bool, bool)) (any, any) {
+	ma, isA := a.(map[string]any)
+	mb, isB := b.(map[string]any)
+	if isA || isB {
+		outA, outB := map[string]any{}, map[string]any{}
+		keys := map[string]bool{}
+		for k := range ma {
+			keys[k] = true
+		}
+		for k := range mb {
+			keys[k] = true
+		}
+		for k := range keys {
+			va, inA := ma[k]
+			vb, inB := mb[k]
+			if secretKey(k) {
+				x, y := maskAll(k, va, vb, inA && inB, sameValue)
+				if inA {
+					outA[k] = x
+				}
+				if inB {
+					outB[k] = y
+				}
+				continue
+			}
+			x, y := maskBoth(va, vb, sameValue)
+			if inA {
+				outA[k] = x
+			}
+			if inB {
+				outB[k] = y
+			}
+		}
+		var ra, rb any
+		if isA {
+			ra = outA
+		} else {
+			ra = a
+		}
+		if isB {
+			rb = outB
+		} else {
+			rb = b
+		}
+		return ra, rb
+	}
+	la, isLA := a.([]any)
+	lb, isLB := b.([]any)
+	if isLA || isLB {
+		outA := make([]any, len(la))
+		outB := make([]any, len(lb))
+		for i := range max(len(la), len(lb)) {
+			var x, y any
+			if i < len(la) {
+				x = la[i]
+			}
+			if i < len(lb) {
+				y = lb[i]
+			}
+			x, y = maskBoth(x, y, sameValue)
+			if i < len(la) {
+				outA[i] = x
+			}
+			if i < len(lb) {
+				outB[i] = y
+			}
+		}
+		var ra, rb any = a, b
+		if isLA {
+			ra = outA
+		}
+		if isLB {
+			rb = outB
+		}
+		return ra, rb
+	}
+	return a, b
+}
+
+// maskAll is a value under a key a secret could be under, masked as one word (maskWord); a file's secrets
+// (SecretsField) alone entry by entry, each its own sealed value: "another seal of the same value" or "another value"
+// per secret, its name shown (issue 1126, C1). Any other object, a vault box included, is one word, judged whole.
+func maskAll(key string, a, b any, both bool, sameValue func(a, b string) (bool, bool)) (any, any) {
+	ma, isA := a.(map[string]any)
+	mb, isB := b.(map[string]any)
+	if key != SecretsField || (!isA && !isB) {
+		w := maskWord(a, b, both, sameValue)
+		return w, w
+	}
+	outA, outB := map[string]any{}, map[string]any{}
+	for k, va := range ma {
+		vb, inB := mb[k]
+		outA[k] = maskWord(va, vb, isB && inB, sameValue)
+	}
+	for k, vb := range mb {
+		va, inA := ma[k]
+		outB[k] = maskWord(va, vb, isA && inA, sameValue)
+	}
+	// A map on one side and another value on the other: the other is one word.
+	var ra, rb any = outA, outB
+	if !isA {
+		ra = maskWord(a, b, both, sameValue)
+	}
+	if !isB {
+		rb = maskWord(a, b, both, sameValue)
+	}
+	return ra, rb
+}
+
+func maskWord(a, b any, both bool, sameValue func(a, b string) (bool, bool)) string {
+	if !both {
+		return "<masked>"
+	}
+	x, _ := json.Marshal(a)
+	y, _ := json.Marshal(b)
+	if bytes.Equal(x, y) {
+		return "<masked: the same on both sides>"
+	}
+	if sameValue != nil {
+		sa, okA := a.(string)
+		sb, okB := b.(string)
+		if !okA {
+			sa = string(x)
+		}
+		if !okB {
+			sb = string(y)
+		}
+		if same, known := sameValue(sa, sb); known {
+			if same {
+				return "<masked: another seal of the same value>"
+			}
+			return "<masked: another value>"
+		}
+	}
+	return "<masked: differs>"
+}

go/delivery/composed_seals.go

@@ -0,0 +1,194 @@
+package delivery
+
+import (
+	"bytes"
+	"encoding/json"
+	"sort"
+	"strconv"
+
+	"git.novox.be/novox/mesh-sdk/go/catalogue"
+)
+
+// Seals is, by slot, each value one composition carries sealed to its node's key (issue 1126, C1): a file's `sealed`
+// a vault box (catalogue.VaultSealedField) and each entry of a file's secrets (SecretsField), as their JSON text (a box is carried as its JSON, a sealed value as
+// the string it is). A slot is one field of one resource of the composition's module (SealSlot): a box is reused only
+// at the slot that holds it, never for another resource whose value opens to the same (a provider's grant and its
+// consumer's secret on one node hold one value).
+type Seals map[string]string
+
+// SealedFields are the fields of a resource that carry a value sealed to the node's key.
+var SealedFields = []string{"sealed", catalogue.VaultSealedField}
+
+// SealSlot is the slot of one sealed field of one resource, by the resource's id (its place, `#<i>`, when it has none).
+// The module is the composition's: a slot is never compared across compositions.
+func SealSlot(resource, field string) string { return resource + "#" + field }
+
+// SecretsField is the field of a file that carries, by name, each sealed value its content asks for
+// (${secret:<name>}, catalogue's intoFile): each entry is a slot of its own (SecretSlotField), so a secret sealed again
+// is judged by the value it opens to, entry by entry, like a file's `sealed` (issue 1126, C1; the seed-7 probe: about 45
+// files on ace and novox differed by their secrets' bytes alone).
+const SecretsField = "secrets"
+
+// SecretSlotField is the field part of the slot of one entry of a file's secrets (SealSlot(id, SecretSlotField(name))).
+func SecretSlotField(name string) string { return SecretsField + "." + name }
+
+// sealAt is one sealed value of a resource: its slot's field, its place (a top-level field, or an entry of the
+// secrets), and its raw JSON.
+type sealAt struct {
+	field, entry string
+	raw          json.RawMessage
+}
+
+// sealsAt is every sealed value of one resource's fields, in a fixed order: SealedFields, then the secrets by name.
+func sealsAt(fields map[string]json.RawMessage) []sealAt {
+	var out []sealAt
+	for _, field := range SealedFields {
+		if f, has := fields[field]; has {
+			out = append(out, sealAt{field: field, raw: f})
+		}
+	}
+	var secrets map[string]json.RawMessage
+	if f, has := fields[SecretsField]; has && json.Unmarshal(f, &secrets) == nil {
+		names := make([]string, 0, len(secrets))
+		for name := range secrets {
+			names = append(names, name)
+		}
+		sort.Strings(names)
+		for _, name := range names {
+			out = append(out, sealAt{field: SecretSlotField(name), entry: name, raw: secrets[name]})
+		}
+	}
+	return out
+}
+
+// SealsIn is every sealed value c carries, by slot; nil when it carries none.
+func SealsIn(c Composed) Seals {
+	var out Seals
+	for i, raw := range c.Resources {
+		id, fields, ok := sealedFieldsOf(raw, i)
+		if !ok {
+			continue
+		}
+		for _, s := range sealsAt(fields) {
+			if text := sealedText(s.raw); text != "" {
+				if out == nil {
+					out = Seals{}
+				}
+				out[SealSlot(id, s.field)] = text
+			}
+		}
+	}
+	return out
+}
+
+// KeepSeals is c with each sealed value replaced by the one kept at the same slot, where same says the two open to the
+// same value (known and same): a value the vault sealed again is then the box that runs, so the composition is the
+// one that runs (ADR 0547 §3, issue 1126). A slot kept holds nothing for, or whose value differs or cannot be opened,
+// keeps c's. Every other byte of a resource is kept as it is; c itself is not changed.
+func KeepSeals(c Composed, kept Seals, same func(a, b string) (same, known bool)) Composed {
+	if len(kept) == 0 || same == nil {
+		return c
+	}
+	out := c
+	out.Resources = nil
+	for i, raw := range c.Resources {
+		id, fields, ok := sealedFieldsOf(raw, i)
+		if ok {
+			for _, s := range sealsAt(fields) {
+				ours := sealedText(s.raw)
+				theirs, held := kept[SealSlot(id, s.field)]
+				if !held || ours == "" || theirs == ours {
+					continue
+				}
+				if opens, known := same(ours, theirs); !known || !opens {
+					continue
+				}
+				value := json.RawMessage(theirs)
+				if s.raw[0] == '"' {
+					value, _ = json.Marshal(theirs)
+				}
+				if s.entry == "" {
+					if swapped, ok := withField(raw, s.field, value); ok {
+						raw = swapped
+					}
+					continue
+				}
+				// An entry of the secrets: swapped inside the secrets as they stand in raw, then the secrets in raw.
+				var now map[string]json.RawMessage
+				if json.Unmarshal(raw, &now) != nil {
+					continue
+				}
+				if secrets, ok := withField(now[SecretsField], s.entry, value); ok {
+					if swapped, ok := withField(raw, SecretsField, secrets); ok {
+						raw = swapped
+					}
+				}
+			}
+		}
+		out.Resources = append(out.Resources, raw)
+	}
+	return out
+}
+
+// sealedFieldsOf is a resource's id (`#<i>` when it has none) and its top-level fields, false when it is no object.
+func sealedFieldsOf(raw json.RawMessage, i int) (string, map[string]json.RawMessage, bool) {
+	var fields map[string]json.RawMessage
+	if json.Unmarshal(raw, &fields) != nil {
+		return "", nil, false
+	}
+	var id string
+	if f, ok := fields["id"]; !ok || json.Unmarshal(f, &id) != nil || id == "" {
+		id = "#" + strconv.Itoa(i)
+	}
+	return id, fields, true
+}
+
+// sealedText is a sealed field as its text: a string as it is, a box as its JSON.
+func sealedText(f json.RawMessage) string {
+	var text string
+	if json.Unmarshal(f, &text) == nil {
+		return text
+	}
+	var compact bytes.Buffer
+	if json.Compact(&compact, f) != nil {
+		return string(f)
+	}
+	return compact.String()
+}
+
+// withField is the object raw with its top-level field replaced by value, every other byte as it was (so a composition
+// whose sealed values are those that run is the one that runs, byte for byte); false when raw is no object holding it.
+func withField(raw json.RawMessage, field string, value json.RawMessage) (json.RawMessage, bool) {
+	d := json.NewDecoder(bytes.NewReader(raw))
+	if t, err := d.Token(); err != nil || t != json.Delim('{') {
+		return nil, false
+	}
+	for d.More() {
+		t, err := d.Token()
+		if err != nil {
+			return nil, false
+		}
+		key, _ := t.(string)
+		before := d.InputOffset()
+		var skip json.RawMessage
+		if err := d.Decode(&skip); err != nil {
+			return nil, false
+		}
+		if key != field {
+			continue
+		}
+		after := d.InputOffset()
+		// The span holds the colon, any space and the value: kept up to the colon, the value replaced.
+		span := raw[before:after]
+		colon := bytes.IndexByte(span, ':')
+		if colon < 0 {
+			return nil, false
+		}
+		out := make([]byte, 0, len(raw)-len(span)+colon+1+len(value))
+		out = append(out, raw[:int(before)+colon+1]...)
+		out = append(out, value...)
+		out = append(out, raw[after:]...)
+		return out, true
+	}
+	return nil, false
+}

go/delivery/delivery.go

@@ -48,6 +48,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"maps"
 	"reflect"
 	"regexp"
 	"slices"
@@ -355,6 +356,10 @@ type Have struct {
 	// after a restart while it opens to the vault's value, so a value sealed again moves no composition. Openable by the
 	// node alone, as the vault hands them over the bus. Empty on every other have.
 	Sealed []string `json:"sealed,omitempty"`
+	// SealedAt is Sealed by slot (Seals: a field of a resource, issue 1126, C1): the composer reuses a box only at the
+	// slot that holds it, so a provider and a consumer of one value on one node each keep their own. Written in Sealed's
+	// place by a node-engine that knows it; Sealed is read only from a have written before.
+	SealedAt Seals `json:"sealed-at,omitempty"`
 }
 
 // UserListWritten is the bus's user list as the node-engine of the bus node wrote it to the bus module's file, applied
@@ -402,8 +407,30 @@ type HaveNode struct {
 	// Record is what the machine observes of itself, typed, for every node and composing part to read (issue 1126,
 	// ADR 0555 §3): the node's record lives in its own have key, so it needs no bucket, writer or grant of its own.
 	Record *NodeRecord `json:"record,omitempty"`
+	// Sealed is, on a node composing its own, each value its own composition carries sealed to the node's key, as
+	// applied (Have.Sealed for the node's own, issue 1126): a value the vault seals again after a restart moves no
+	// composition, so a restart applies nothing again.
+	Sealed []string `json:"sealed,omitempty"`
+	// SealedAt is Sealed by slot (Have.SealedAt).
+	SealedAt Seals `json:"sealed-at,omitempty"`
+	// Candidates is the node's answer to each placement candidate naming it, by proposal id (PlacementCandidate): written by
+	// its shadow composer whenever an answer changes, removed when the candidate key goes. The node applies nothing of a
+	// candidate.
+	Candidates map[string]CandidateAnswer `json:"candidates,omitempty"`
+	// Composes is whose compositions the node applies: its own (ComposesOwn, placement places it) or the
+	// controller's (ComposesController); ComposesWhy says why in words. Written by the node agent at each start, so a
+	// node returning to the controller's compositions when its placement key is deleted says so (issue 1126). Empty
+	// from an engine older than the field.
+	Composes    string `json:"composes,omitempty"`
+	ComposesWhy string `json:"composes-why,omitempty"`
 }
 
+// Whose compositions a node applies (HaveNode.Composes).
+const (
+	ComposesOwn        = "own"
+	ComposesController = "controller"
+)
+
 // Presence is whether a node or a part's instance is online; the entry's own time says since when. The watchman
 // writes it.
 type Presence struct {
@@ -497,17 +524,43 @@ func DecodeHave(data []byte) (Have, error) {
 	return h, nil
 }
 
-// EncodeHaveNode is n as JSON at Version.
+func (n HaveNode) check() error {
+	switch n.Composes {
+	case "", ComposesOwn, ComposesController:
+	default:
+		return fmt.Errorf("delivery: a node composes %q, neither %s nor %s", n.Composes, ComposesOwn, ComposesController)
+	}
+	for group, a := range n.Candidates {
+		if group == "" {
+			return fmt.Errorf("delivery: a node's candidate answer names no group")
+		}
+		if err := a.check(); err != nil {
+			return fmt.Errorf("delivery: the answer to %s's candidate: %w", group, err)
+		}
+	}
+	return nil
+}
+
+// EncodeHaveNode is n as JSON at Version; it refuses a candidate answer CandidateAnswer's rules refuse.
 func EncodeHaveNode(n HaveNode) ([]byte, error) {
+	if err := n.check(); err != nil {
+		return nil, err
+	}
 	n.V = Version
 	return json.Marshal(n)
 }
 
-// DecodeHaveNode reads a node's facts; it refuses an unknown version (ErrUnknownVersion).
+// DecodeHaveNode reads a node's facts; it refuses an unknown version (ErrUnknownVersion) and a candidate answer that
+// is not one.
 func DecodeHaveNode(data []byte) (HaveNode, error) {
 	var n HaveNode
-	err := decode(data, &n)
-	return n, err
+	if err := decode(data, &n); err != nil {
+		return n, err
+	}
+	if err := n.check(); err != nil {
+		return HaveNode{}, err
+	}
+	return n, nil
 }
 
 // EncodePresence is p as JSON at Version.
@@ -540,10 +593,11 @@ func DecodePulse(data []byte) (Pulse, error) {
 func SameHave(a, b Have) bool {
 	ua, ub := a.UserList, b.UserList
 	a.UserList, b.UserList = nil, nil
-	if !slices.Equal(a.Sealed, b.Sealed) {
+	if !slices.Equal(a.Sealed, b.Sealed) || !maps.Equal(a.SealedAt, b.SealedAt) {
 		return false
 	}
 	a.Sealed, b.Sealed = nil, nil
+	a.SealedAt, b.SealedAt = nil, nil
 	if !reflect.DeepEqual(a, b) || (ua == nil) != (ub == nil) {
 		return false
 	}
@@ -560,7 +614,9 @@ func SameHave(a, b Have) bool {
 func SameHaveNode(a, b HaveNode) bool {
 	return a.V == b.V && a.Composed == b.Composed && sameJSON(a.Windows, b.Windows) && sameJSON(a.Busy, b.Busy) &&
 		sameJSON(a.Strays, b.Strays) && sameJSON(a.Filters, b.Filters) && sameJSON(a.Profile, b.Profile) &&
-		(a.Record == nil) == (b.Record == nil) && (a.Record == nil || SameNodeRecord(*a.Record, *b.Record))
+		(a.Record == nil) == (b.Record == nil) && (a.Record == nil || SameNodeRecord(*a.Record, *b.Record)) &&
+		jsonEqual(a.Sealed, b.Sealed) && maps.Equal(a.SealedAt, b.SealedAt) && jsonEqual(a.Candidates, b.Candidates) && a.Composes == b.Composes &&
+		a.ComposesWhy == b.ComposesWhy
 }
 
 // SamePresence says whether two presences are the same value.

go/delivery/forge_inputs_test.go

@@ -9,10 +9,9 @@ const oddManifest = "{\n\t\"module\":   \"a\",\n  \"z\": 1, \"a\": [ \"x\",\"y\"
 
 func mergedWithInputs() Forge {
 	return Forge{Kind: ForgeMerged, Repository: "novox/mesh-sdk", Number: 36, Head: "aaaa", Merge: "cccc", Root: "t0",
-		Trees:      map[string]string{"a": "t1", "b": "t2"},
-		Manifests:  map[string]string{"a": oddManifest},
-		Locks:      map[string]map[string]string{"a": {"go.sum": strings.Repeat("ab", 32)}},
-		Placements: map[string]string{"ace": `{"v":1,"node":"ace","modules":[]}`}, PlacementsRead: true}
+		Trees:     map[string]string{"a": "t1", "b": "t2"},
+		Manifests: map[string]string{"a": oddManifest},
+		Locks:     map[string]map[string]string{"a": {"go.sum": strings.Repeat("ab", 32)}}}
 }
 
 // 1442/AC1
@@ -22,7 +21,7 @@ func TestForgeMergedCarriesManifestsAndLocks(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	for _, frag := range []string{`"manifests":{"a":`, `"locks":{"a":{"go.sum":`, `"placements":{"ace":`, `"placements-read":true`} {
+	for _, frag := range []string{`"manifests":{"a":`, `"locks":{"a":{"go.sum":`} {
 		if !strings.Contains(string(data), frag) {
 			t.Errorf("the encoding lacks %s: %s", frag, data)
 		}
@@ -48,9 +47,9 @@ func TestForgeMergedRefusesBadInputs(t *testing.T) {
 		"locks outside trees":    {func(f *Forge) { f.Locks["yy"] = map[string]string{"go.sum": "h"} }, `"yy"`},
 		"empty manifest":         {func(f *Forge) { f.Manifests["b"] = "" }, `"b"`},
 		"empty lock hash":        {func(f *Forge) { f.Locks["a"]["go.sum"] = "" }, `"a"`},
-		"placements unsaid":      {func(f *Forge) { f.PlacementsRead = false }, "placements-read"},
-		"placement of no node":   {func(f *Forge) { f.Placements["a.b"] = "{}" }, "names no node"},
-		"placements on a pull":   {func(f *Forge) { f.Kind, f.Action, f.Merge, f.Root, f.Trees = ForgePull, PullOpened, "", "", nil }, "only a merged message"},
+		// No repository holds placement (ADR 0567 §11): a message carrying placement files is refused, on a merge or a pull.
+		"placement files": {func(f *Forge) { f.RetiredPlacements = []byte(`{"anchor":"{}"}`) }, "mesh-placement"},
+		"placements read": {func(f *Forge) { f.RetiredRead = true }, "mesh-placement"},
 	} {
 		f := mergedWithInputs()
 		tc.mut(&f)