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/announce/announce.go

@@ -46,6 +46,10 @@ func Key(module string) (string, error) {
 type State struct {
 	Name     string `json:"name"`
 	Readable bool   `json:"readable,omitempty"`
+	// Readers, when named, are the only modules that may read the state (novox/hq ADR 0547 clause 9, issue 1945): a
+	// state readable by some and not all, such as the vault's bus account hashes. Only ReadableBy grants them; Readable,
+	// which a composer that knows no readers asks, stays false for it, so such a composer grants nobody.
+	Readers []string `json:"readers,omitempty"`
 }
 
 // States is an announcement: the module, the machine whose instance said it, and every state the module keeps, sorted
@@ -67,6 +71,26 @@ func (s States) Keeps(state string) bool {
 	return false
 }
 
+// ReadableBy says whether the module announced the state readable by reader: readable, and reader among the readers
+// when it names any.
+func (s States) ReadableBy(state, reader string) bool {
+	for _, k := range s.States {
+		if k.Name != state {
+			continue
+		}
+		if len(k.Readers) > 0 {
+			for _, r := range k.Readers {
+				if r == reader {
+					return true
+				}
+			}
+			return false
+		}
+		return k.Readable
+	}
+	return false
+}
+
 // Readable says whether the module announced the state readable by others.
 func (s States) Readable(state string) bool {
 	for _, k := range s.States {
@@ -93,6 +117,11 @@ func (s *States) check() error {
 			return fmt.Errorf("announce: %s announces the state %q twice", s.Module, k.Name)
 		}
 		seen[k.Name] = true
+		for _, r := range k.Readers {
+			if !name.MatchString(r) {
+				return fmt.Errorf("announce: %s names %q as a reader of %s, and a reader is a module: lower-case letters, digits and hyphens", s.Module, r, k.Name)
+			}
+		}
 	}
 	return nil
 }

go/announce/announce_test.go

@@ -9,7 +9,8 @@ import (
 // own event subject, in a versioned value the controller keeps by module.
 func TestAnAnnouncementRoundTripsSortedAndSaysWhatIsReadable(t *testing.T) {
 	data, err := Encode(States{Module: "mesh-controller", Node: "novox", States: []State{
-		{Name: "plans-building", Readable: true}, {Name: "assignments", Readable: true}, {Name: "own"}}})
+		{Name: "plans-building", Readable: true}, {Name: "assignments", Readable: true}, {Name: "own"},
+		{Name: "hashes", Readers: []string{"mesh-grants"}}}})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -24,12 +25,17 @@ func TestAnAnnouncementRoundTripsSortedAndSaysWhatIsReadable(t *testing.T) {
 	for _, s := range back.States {
 		names = append(names, s.Name)
 	}
-	if strings.Join(names, ",") != "assignments,own,plans-building" {
+	if strings.Join(names, ",") != "assignments,hashes,own,plans-building" {
 		t.Fatalf("the states are not sorted: %v", names)
 	}
 	if !back.Readable("plans-building") || back.Readable("own") || back.Readable("absent") {
 		t.Fatal("Readable does not say what was announced readable")
 	}
+	// Named readers (ADR 0547 clause 9): readable by them alone, and not readable to a composer that knows no readers.
+	if back.Readable("hashes") || !back.ReadableBy("hashes", "mesh-grants") || back.ReadableBy("hashes", "spy") ||
+		!back.ReadableBy("plans-building", "spy") || back.ReadableBy("own", "spy") {
+		t.Fatal("ReadableBy does not say who was named")
+	}
 	if !back.Keeps("own") || back.Keeps("absent") {
 		t.Fatal("Keeps does not say what was announced")
 	}
@@ -57,6 +63,7 @@ func TestAnAnnouncementRefusesWhatNoBucketCouldBe(t *testing.T) {
 		{States{Module: "a", States: []State{{Name: "x_y"}}}, `"x_y"`},
 		{States{Module: "a", States: []State{{Name: ""}}}, `""`},
 		{States{Module: "a", States: []State{{Name: "x"}, {Name: "x", Readable: true}}}, "twice"},
+		{States{Module: "a", States: []State{{Name: "x", Readers: []string{"b.c"}}}}, `"b.c"`},
 	} {
 		if _, err := Encode(c.s); err == nil || !strings.Contains(err.Error(), c.says) {
 			t.Errorf("%+v: %v, wanted a refusal saying %s", c.s, err, c.says)

go/buildcpu/buildcpu.go

@@ -0,0 +1,215 @@
+// Package buildcpu is how much of a build node's processors its builds may take, and how they yield to everything else
+// there (novox/hq ADR 0553, issue 1806; the operator, 2026-10-26: "limit CPU usage on our build nodes so the total cpu
+// usage never impacts the normal workings of our nodes ... We have 3 build agents so they should share the cpu power").
+//
+// Three parts, each with one owner:
+//
+//   - **Priority.** A build seat's holder (catalogue.Seat.Yields) runs at the lowest priority there is: the composer
+//     gives its runtime process declaration.Yields, and the node-engine places every yielding process of the node in
+//     one slice (declaration.YieldSlice) whose CPU weight is idle, with Nice=19 for every process it starts.
+//     Interactive and service work always comes first; builds take the cycles nothing else wants.
+//   - **One cap per node, shared.** The node's share of its processors is one value, the node-engine's own config
+//     `build-cpu-share` (ShareSetting), set per node through the node's settings layer. The node-engine writes it as the
+//     slice's CPUQuota: one bound the kernel holds for all the node's build modules together, never one per module.
+//   - **Threads.** The quota bounds the total; threads only size each step. A step gets the share divided by its own
+//     module's capacity (Threads), from the share the composer hands as a word (ShareWord): GOMAXPROCS sets every go
+//     command's -p, the compiler's concurrency, a test binary's processors and -parallel. A module given no word sets
+//     no thread limit at all: without the slice there is nothing to size a step to, and a limit then would only slow
+//     builds.
+package buildcpu
+
+import (
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// ShareSetting is the node-engine's config value of the node's processor share for its builds, in percent of the
+// machine's processors, 1 to 100: one value per node, set through the node's settings layer (novox/hq ADR 0553 §3).
+const ShareSetting = "build-cpu-share"
+
+// DefaultPercent is the share where nothing sets one: half the machine, so a desktop keeps half its processors for
+// itself whatever builds.
+const DefaultPercent = 50
+
+// ShareWord is the word the composer gives every yielding module (novox/hq ADR 0553 §4): the node's share, in percent.
+const ShareWord = "MESH_BUILD_CPU_SHARE"
+
+// Quota is a CPUQuota for a share of a machine with cores processors: systemd counts a quota in percent of one
+// processor, so half of 24 is 1200%. At least 100%, one processor, so a share on a small machine never stops a step.
+func Quota(percent, cores int) int {
+	q := percent * cores
+	if q < 100 {
+		q = 100
+	}
+	return q
+}
+
+// Threads is how many threads one step may run at once: its part of the share when its own module runs slots steps at
+// once, at least one. The slice's quota bounds the steps of all the node's build modules together; this only sizes one.
+func Threads(percent, cores, slots int) int {
+	if slots < 1 {
+		slots = 1
+	}
+	if percent < 1 || percent > 100 {
+		percent = DefaultPercent
+	}
+	t := cores * percent / 100 / slots
+	if t < 1 {
+		t = 1
+	}
+	return t
+}
+
+// Limits is what one step is held to on this node, as a status tool says it.
+type Limits struct {
+	// Percent is the node's share in percent of its processors, and From where it was read: ShareWord, or "none" when
+	// the composer gave no share and a step runs without a thread limit.
+	Percent int    `json:"share-percent,omitempty"`
+	From    string `json:"share-from"`
+	// Cores is the machine's processor count.
+	Cores int `json:"cores"`
+	// Slots is this module's own capacity on the node: steps at once.
+	Slots int `json:"slots"`
+	// Threads is what each step is given (Threads); 0 is no limit.
+	Threads int `json:"threads-per-step"`
+}
+
+// FromWords is the limits of a step from the share the composer gave this process (ShareWord) and the module's own
+// capacity. Without a usable share there is no limit: Threads is 0.
+func FromWords(getenv func(string) string, own int) Limits {
+	if own < 1 {
+		own = 1
+	}
+	l := Limits{From: "none", Cores: runtime.NumCPU(), Slots: own}
+	if n, err := strconv.Atoi(strings.TrimSpace(getenv(ShareWord))); err == nil && n >= 1 && n <= 100 {
+		l.Percent, l.From = n, ShareWord
+		l.Threads = Threads(n, l.Cores, own)
+	}
+	return l
+}
+
+// Env is the environment a step's commands are given so they start no more threads than they may: GOMAXPROCS for every
+// Go program (the compiler, a test binary, esbuild, buildah), UV_THREADPOOL_SIZE for Node's worker pool. Returned as
+// KEY=value words to append to a command's environment; nothing for 0 threads, no limit.
+func Env(threads int) []string {
+	if threads < 1 {
+		return nil
+	}
+	t := strconv.Itoa(threads)
+	return []string{"GOMAXPROCS=" + t, "UV_THREADPOOL_SIZE=" + t}
+}
+
+// InForce is what the kernel holds this process to, read rather than assumed (evidence over assertion): its nice
+// level, its cgroup (the unit) and the cgroup's parent (the slice the node-engine placed it in), each one's CPU weight,
+// idle mark and quota. A field the machine does not answer is left empty and Unread says which.
+//
+// The IO weight is read but binds only where the disk's scheduler honours it (bfq, or the io.cost controller); under
+// the scheduler `none`, the usual one for NVMe, it does nothing, and the CPU bound is what holds.
+type InForce struct {
+	Nice   int    `json:"nice"`
+	Cgroup string `json:"cgroup,omitempty"`
+	Unit   Group  `json:"unit"`
+	Slice  Group  `json:"slice"`
+	// Quota is the tighter of the two groups' cpu.max as a percent of one processor, 0 with none.
+	Quota  int      `json:"quota-percent,omitempty"`
+	Unread []string `json:"unread,omitempty"`
+}
+
+// Group is one cgroup's controls.
+type Group struct {
+	Path      string `json:"path,omitempty"`
+	CPUIdle   string `json:"cpu-idle,omitempty"`
+	CPUWeight string `json:"cpu-weight,omitempty"`
+	// CPUMax is the cgroup's cpu.max: "<quota µs> <period µs>", or "max" with no quota.
+	CPUMax   string `json:"cpu-max,omitempty"`
+	IOWeight string `json:"io-weight,omitempty"`
+}
+
+// cgroupRoot is where the unified hierarchy is mounted. A variable so a test can point it elsewhere.
+var cgroupRoot = "/sys/fs/cgroup"
+
+// procSelfCgroup is this process's cgroup file. A variable so a test can point it elsewhere.
+var procSelfCgroup = "/proc/self/cgroup"
+
+// procSelfStat is this process's stat file. A variable so a test can point it elsewhere.
+var procSelfStat = "/proc/self/stat"
+
+// ReadInForce reads what the kernel holds this process to.
+func ReadInForce() InForce {
+	var f InForce
+	f.Nice = nice()
+	raw, err := os.ReadFile(procSelfCgroup)
+	if err != nil {
+		f.Unread = append(f.Unread, "cgroup: "+err.Error())
+		return f
+	}
+	for _, line := range strings.Split(strings.TrimSpace(string(raw)), "\n") {
+		if strings.HasPrefix(line, "0::") {
+			f.Cgroup = strings.TrimPrefix(line, "0::")
+		}
+	}
+	if f.Cgroup == "" {
+		f.Unread = append(f.Unread, "cgroup: not on the unified hierarchy")
+		return f
+	}
+	read := func(path string) Group {
+		g := Group{Path: path}
+		value := func(name string) string {
+			b, err := os.ReadFile(cgroupRoot + path + "/" + name)
+			if err != nil {
+				f.Unread = append(f.Unread, path+"/"+name+": "+err.Error())
+				return ""
+			}
+			return strings.TrimSpace(string(b))
+		}
+		g.CPUIdle, g.CPUWeight, g.CPUMax, g.IOWeight = value("cpu.idle"), value("cpu.weight"), value("cpu.max"), value("io.weight")
+		return g
+	}
+	f.Unit = read(f.Cgroup)
+	if i := strings.LastIndex(f.Cgroup, "/"); i > 0 {
+		f.Slice = read(f.Cgroup[:i])
+	}
+	for _, q := range []int{quotaOf(f.Unit.CPUMax), quotaOf(f.Slice.CPUMax)} {
+		if q > 0 && (f.Quota == 0 || q < f.Quota) {
+			f.Quota = q
+		}
+	}
+	return f
+}
+
+// quotaOf is a cpu.max value as a percent of one processor: "1200000 100000" is 1200; "max ..." or nothing is 0.
+func quotaOf(cpuMax string) int {
+	fields := strings.Fields(cpuMax)
+	if len(fields) != 2 || fields[0] == "max" {
+		return 0
+	}
+	q, err1 := strconv.Atoi(fields[0])
+	p, err2 := strconv.Atoi(fields[1])
+	if err1 != nil || err2 != nil || p <= 0 {
+		return 0
+	}
+	return q * 100 / p
+}
+
+// nice is this process's nice level from its stat file (the 19th field, counted after the command's closing
+// parenthesis, which may itself hold spaces); 0 when it cannot be read.
+func nice() int {
+	raw, err := os.ReadFile(procSelfStat)
+	if err != nil {
+		return 0
+	}
+	s := string(raw)
+	i := strings.LastIndex(s, ")")
+	if i < 0 {
+		return 0
+	}
+	fields := strings.Fields(s[i+1:])
+	// After the command: state is field 3, so nice (field 19) is index 16.
+	if len(fields) < 17 {
+		return 0
+	}
+	n, _ := strconv.Atoi(fields[16])
+	return n
+}

go/buildcpu/buildcpu_test.go

@@ -0,0 +1,90 @@
+package buildcpu
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"testing"
+)
+
+// The node's share as a quota, the threads one step is given for its own module's capacity, and the word the composer
+// hands, in one table (ADR 0553, issue 1806).
+func TestShareQuotaAndThreads(t *testing.T) {
+	for _, c := range []struct {
+		name                  string
+		percent, cores, slots int
+		quota, threads        int
+	}{
+		{"shanks: half of 24, three slots", 50, 24, 3, 1200, 4},
+		{"ace: three quarters of 24, two slots", 75, 24, 2, 1800, 9},
+		{"g14: half of 16, one slot", 50, 16, 1, 800, 8},
+		{"one processor at least", 10, 2, 4, 100, 1},
+		{"no slots counts as one", 100, 4, 0, 400, 4},
+		{"a share out of range is the default", 0, 8, 1, 0, 4},
+	} {
+		if c.quota != 0 {
+			if q := Quota(c.percent, c.cores); q != c.quota {
+				t.Errorf("%s: Quota = %d, want %d", c.name, q, c.quota)
+			}
+		}
+		if th := Threads(c.percent, c.cores, c.slots); th != c.threads {
+			t.Errorf("%s: Threads = %d, want %d", c.name, th, c.threads)
+		}
+	}
+	l := FromWords(func(k string) string { return map[string]string{ShareWord: "75"}[k] }, 2)
+	if l.Percent != 75 || l.From != ShareWord || l.Slots != 2 || l.Threads != Threads(75, runtime.NumCPU(), 2) {
+		t.Errorf("from the word: %+v", l)
+	}
+	// Told nothing usable, a step has no thread limit: nothing in its environment.
+	for _, word := range []string{"", "250", "lots"} {
+		l := FromWords(func(string) string { return word }, 3)
+		if l.Threads != 0 || l.From != "none" || Env(l.Threads) != nil {
+			t.Errorf("share %q: %+v, env %v", word, l, Env(l.Threads))
+		}
+	}
+	if got := Env(3); !reflect.DeepEqual(got, []string{"GOMAXPROCS=3", "UV_THREADPOOL_SIZE=3"}) {
+		t.Errorf("Env = %q", got)
+	}
+}
+
+// What the kernel holds a process to is read from its unit's and its slice's cgroup and its stat file, not assumed.
+func TestReadInForce(t *testing.T) {
+	dir := t.TempDir()
+	cg := filepath.Join(dir, "cg")
+	slice := filepath.Join(cg, "meshyield.slice")
+	unit := filepath.Join(slice, "mesh-build-go-runtime.service")
+	if err := os.MkdirAll(unit, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	for at, files := range map[string]map[string]string{
+		slice: {"cpu.idle": "1\n", "cpu.weight": "0\n", "cpu.max": "1200000 100000\n", "io.weight": "default 1\n"},
+		unit:  {"cpu.idle": "0\n", "cpu.weight": "100\n", "cpu.max": "max 100000\n", "io.weight": "default 100\n"},
+	} {
+		for name, v := range files {
+			if err := os.WriteFile(filepath.Join(at, name), []byte(v), 0o644); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}
+	self := filepath.Join(dir, "cgroup")
+	stat := filepath.Join(dir, "stat")
+	_ = os.WriteFile(self, []byte("0::/meshyield.slice/mesh-build-go-runtime.service\n"), 0o644)
+	// A command with a space and a parenthesis in it, then nice 19 in field 19.
+	_ = os.WriteFile(stat, []byte("42 (mesh (build) go) S 1 42 42 0 -1 4194560 1 0 0 0 0 0 0 0 39 19 8 0 1 2 3\n"), 0o644)
+	cgroupRoot, procSelfCgroup, procSelfStat = cg, self, stat
+	t.Cleanup(func() {
+		cgroupRoot, procSelfCgroup, procSelfStat = "/sys/fs/cgroup", "/proc/self/cgroup", "/proc/self/stat"
+	})
+
+	got := ReadInForce()
+	want := InForce{Nice: 19, Cgroup: "/meshyield.slice/mesh-build-go-runtime.service",
+		Unit: Group{Path: "/meshyield.slice/mesh-build-go-runtime.service", CPUIdle: "0", CPUWeight: "100",
+			CPUMax: "max 100000", IOWeight: "default 100"},
+		Slice: Group{Path: "/meshyield.slice", CPUIdle: "1", CPUWeight: "0", CPUMax: "1200000 100000",
+			IOWeight: "default 1"},
+		Quota: 1200}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("ReadInForce = %+v\nwant %+v", got, want)
+	}
+}

go/buildstep/askrun.go

@@ -34,6 +34,9 @@ type AskSteps struct {
 	// the module's sweep.
 	Release func(workspace string) error
 	Logf    func(format string, args ...any)
+	// Has says whether this node has a need a package's tests declare (delivery.AskNeeds, issue 890); a package needing
+	// what it lacks is not tested here but named in the level's Unmet, for the asker to place. Nil has nothing.
+	Has func(need string) bool
 }
 
 // RunAsk runs ask's job with steps and answers a delivery.BuildAnswer or a delivery.CheckAnswer.
@@ -67,6 +70,11 @@ func (s AskSteps) fetch(ctx context.Context, args map[string]any) (json.RawMessa
 	if s.Fetch == nil {
 		return nil, fetched{}, Refuse("this build module fetches nothing")
 	}
+	if _, merges := args["base"]; merges {
+		Phase(ctx, "fetch and merge")
+	} else {
+		Phase(ctx, "fetch")
+	}
 	out, err := s.Fetch(ctx, args)
 	if err != nil {
 		return nil, fetched{}, err
@@ -123,6 +131,7 @@ func (s AskSteps) build(ctx context.Context, job delivery.BuildJob) (any, error)
 			if s.Copy == nil {
 				return nil, Refuse("this build module copies no artifact (%s)", a.Artifact)
 			}
+			Phase(ctx, "copy "+a.Artifact)
 			out, err = s.Copy(ctx, map[string]any{"module": job.Module, "artifact": a.Artifact, "from": a.From})
 		} else {
 			if s.Build == nil {
@@ -132,6 +141,7 @@ func (s AskSteps) build(ctx context.Context, job delivery.BuildJob) (any, error)
 			if job.Publish {
 				args["publish"] = true
 			}
+			Phase(ctx, "build "+a.Artifact)
 			out, err = s.Build(ctx, args)
 		}
 		if err != nil {
@@ -190,9 +200,19 @@ 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) {
+		what := "the whole level"
+		if dir, _ := args["module"].(string); dir != "" {
+			what = dir
+		} else if pkgs, _ := args["packages"].([]string); len(pkgs) > 0 {
+			what = fmt.Sprintf("%d packages", len(pkgs))
+		}
+		Phase(ctx, fmt.Sprintf("%s: tests of %s", level, what))
 		out, err := s.Test(ctx, args)
 		if err != nil {
 			return false, err
@@ -231,6 +251,9 @@ func (s AskSteps) level(ctx context.Context, job delivery.CheckJob, level string
 	if !keepRunner {
 		runner = "" // an installed module that ignores the runner judges the level as it judges any other (ADR 0535 §2)
 	}
+	if whole && len(job.Packages) > 0 {
+		todo, whole = job.Packages, false // a placed ask tests its packages alone, whatever the digest said (ADR 0552 §4)
+	}
 	for _, priority := range []bool{true, false} {
 		args := withRunner(map[string]any{"workspace": f.Workspace, "level": level})
 		if job.Run != "" {
@@ -281,6 +304,7 @@ func (s AskSteps) plan(ctx context.Context, job delivery.CheckJob, level string,
 	if job.Run != "" {
 		return nil, true, true
 	}
+	Phase(ctx, level+": digest")
 	out, err := s.Digest(ctx, withRunner(map[string]any{"workspace": f.Workspace, "level": level}))
 	if err != nil {
 		if s.Logf != nil {
@@ -307,9 +331,16 @@ func (s AskSteps) plan(ctx context.Context, job delivery.CheckJob, level string,
 		return nil, true, runner != "" // a digest that names nothing or not the siblings keys no verdict: the level runs whole
 	}
 	la.Digest = &d
+	only := map[string]bool{}
+	for _, p := range job.Packages {
+		only[p] = true
+	}
 	var todo []string
 	for _, pd := range d.Packages {
 		p := pd.Package
+		if len(only) > 0 && !only[p] {
+			continue // a placed ask's other packages were judged by the first ask (ADR 0552 §4)
+		}
 		if job.Kept && s.Kept != nil {
 			tests, found, err := s.Kept(ctx, level, pd.Digest)
 			if err != nil && s.Logf != nil {
@@ -320,6 +351,15 @@ func (s AskSteps) plan(ctx context.Context, job delivery.CheckJob, level string,
 				continue
 			}
 		}
+		if needs := d.NeedsOf(p); len(delivery.Lacks(needs, s.Has)) > 0 {
+			// Its tests would only skip here (issue 890): it is left for a node that has what they need.
+			la.Unmet = append(la.Unmet, delivery.PackageNeeds{Package: p, Needs: needs})
+			if s.Logf != nil {
+				s.Logf("the %s level of %s is left to a node with %s: this node lacks %s", level, p,
+					strings.Join(needs, ", "), strings.Join(delivery.Lacks(needs, s.Has), ", "))
+			}
+			continue
+		}
 		todo = append(todo, p)
 	}
 	return todo, false, false

go/buildstep/askrun_test.go

@@ -20,6 +20,7 @@ type recorder struct {
 	fetch   map[string]any
 	tests   map[string]bool // package or module directory -> passed
 	digests map[string]string
+	needs   []delivery.PackageNeeds
 }
 
 func (r *recorder) steps() AskSteps {
@@ -35,8 +36,10 @@ func (r *recorder) steps() AskSteps {
 		Build: call("build", func(args map[string]any) any {
 			return map[string]any{"digest": "sha256:" + args["artifact"].(string), "reference": "artifact-store://" + args["artifact"].(string)}
 		}),
-		Copy:   call("copy", func(args map[string]any) any { return map[string]any{"digest": "sha256:copied"} }),
-		Digest: call("digest", func(map[string]any) any { return map[string]any{"level": "unit", "packages": r.digests} }),
+		Copy: call("copy", func(args map[string]any) any { return map[string]any{"digest": "sha256:copied"} }),
+		Digest: call("digest", func(map[string]any) any {
+			return map[string]any{"level": "unit", "packages": r.digests, "needs": r.needs}
+		}),
 		Test: call("test", func(args map[string]any) any {
 			passed := true
 			if pkgs, ok := args["packages"].([]string); ok {
@@ -139,6 +142,52 @@ test {"level":"unit","packages":["x/pkg/a"],"workspace":"/w"}`
 	if u.Level != delivery.LevelUnit || len(u.Kept) != 1 || u.Kept[0].Package != "x/pkg/k" || u.Kept[0].Tests != 7 || len(u.Tests) != 2 || u.Digest == nil {
 		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} {
+		r.calls, r.tests["x/pkg/b"] = nil, true
+		r.needs = []delivery.PackageNeeds{{Package: "x/pkg/a", Needs: []string{delivery.NeedNodeBuildNode}}}
+		steps := r.steps()
+		if has {
+			steps.Has = func(n string) bool { return n == delivery.NeedNodeBuildNode }
+		}
+		out, err := RunAsk(context.Background(), steps, ask(delivery.CheckJob{Levels: []string{delivery.LevelUnit}, Kept: true,
+			Fetch: map[string]any{"repository": "novox/x", "commit": runCommit}}))
+		if err != nil {
+			t.Fatal(err)
+		}
+		u := out.(delivery.CheckAnswer).Levels[0]
+		tested := strings.Contains(strings.Join(r.calls, "\n"), `"x/pkg/a"`)
+		if tested != has || (len(u.Unmet) == 0) == !has || (!has && (u.Unmet[0].Package != "x/pkg/a" || delivery.UnmetNeeds([]delivery.LevelAnswer{u})[0] != delivery.NeedNodeBuildNode)) {
+			t.Fatalf("has %v: tested x/pkg/a %v, unmet %+v, calls %v", has, tested, u.Unmet, r.calls)
+		}
+	}
+	// A placed ask naming its packages tests those alone and takes no other's kept verdict, also when the level would
+	// run whole (ADR 0552 §4).
+	for _, digests := range []map[string]string{r.digests, nil} {
+		r.calls, r.digests = nil, digests
+		steps := r.steps()
+		steps.Has = func(string) bool { return true }
+		out, err := RunAsk(context.Background(), steps, ask(delivery.CheckJob{Levels: []string{delivery.LevelUnit}, Kept: true, Packages: []string{"x/pkg/a"},
+			Fetch: map[string]any{"repository": "novox/x", "commit": runCommit}}))
+		if err != nil {
+			t.Fatal(err)
+		}
+		u := out.(delivery.CheckAnswer).Levels[0]
+		if last := r.calls[len(r.calls)-1]; !strings.HasSuffix(last, `"packages":["x/pkg/a"],"workspace":"/w"}`) || len(u.Kept) != 0 || len(u.Tests) != 1 {
+			t.Fatalf("digests %v: calls %v, kept %+v: want x/pkg/a alone tested, nothing taken kept", digests != nil, r.calls, u.Kept)
+		}
+	}
 }
 
 // ADR 0535 §2, §4: a merge that changes the build module's own code is judged by the candidate's runner: its digest says

go/buildstep/buildhours.go

@@ -0,0 +1,129 @@
+package buildstep
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+// **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 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.
+type BuildWindow struct {
+	Start, End int
+}
+
+// String is the window as the setting writes it.
+func (w BuildWindow) String() string {
+	return fmt.Sprintf("%02d:%02d-%02d:%02d", w.Start/60, w.Start%60, w.End/60, w.End%60)
+}
+
+// Open says whether t, in its own location, falls in the window.
+func (w BuildWindow) Open(t time.Time) bool {
+	m := t.Hour()*60 + t.Minute()
+	if w.Start < w.End {
+		return m >= w.Start && m < w.End
+	}
+	return m >= w.Start || m < w.End
+}
+
+// NextEdge is the first time after t, in t's location, at which the window opens or closes.
+func (w BuildWindow) NextEdge(t time.Time) time.Time {
+	var next time.Time
+	for day := 0; day <= 1; day++ {
+		for _, m := range []int{w.Start, w.End} {
+			e := time.Date(t.Year(), t.Month(), t.Day()+day, m/60, m%60, 0, 0, t.Location())
+			if e.After(t) && (next.IsZero() || e.Before(next)) {
+				next = e
+			}
+		}
+	}
+	return next
+}
+
+// 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
+	}
+	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.
+func minuteOf(s string) (int, error) {
+	var h, m int
+	s = strings.TrimSpace(s)
+	if n, err := fmt.Sscanf(s, "%d:%d", &h, &m); err != nil || n != 2 || h < 0 || h > 23 || m < 0 || m > 59 || len(s) != 5 {
+		return 0, fmt.Errorf("%q is not a time HH:MM", s)
+	}
+	return h*60 + m, nil
+}
+
+// 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
+// logf, and the puller writes it in the capacity record that build_usage shows.
+func NodeBuildHours(path, node string, logf func(string, ...any)) func() (*BuildWindow, string) {
+	said := ""
+	say := func(why string) {
+		if logf != nil && why != said {
+			said = why
+			logf("%s, so %s builds at any hour", why, node)
+		}
+	}
+	fault := func(why string) (*BuildWindow, string) {
+		say(why)
+		return nil, why
+	}
+	return func() (*BuildWindow, string) {
+		if path == "" {
+			return nil, ""
+		}
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			return fault(fmt.Sprintf("the setting %s cannot be read: %v", BuildHoursSetting, err))
+		}
+		var s map[string]json.RawMessage
+		if err := json.Unmarshal(raw, &s); err != nil {
+			return fault(fmt.Sprintf("the settings file %s is not JSON: %v", path, err))
+		}
+		setting := ""
+		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 := ParseBuildWindow(setting)
+		if err != nil {
+			return fault(err.Error())
+		}
+		said = ""
+		return w, ""
+	}
+}

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

@@ -0,0 +1,141 @@
+package buildstep
+
+import (
+	"encoding/json"
+	"fmt"
+	"math"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/buildcpu"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// **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 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
+// without a restart, and the result is said (the seat's current verb, the status tools, `capacity.<node>` in the pauses
+// state that the delivery view's build_usage reads).
+
+// CoresPerStepSetting is a build module's setting of the processors one of its steps needs: a number above zero, the
+// same on every node (a step's need is the module's, not the node's). Each build module declares it with its own default
+// (DefaultCoresPerStep).
+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 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}
+
+// Quota is the build slice's CPU quota as this process's cgroup holds it, in percent of one processor (1200 is 12
+// cores), and where it was read: the cgroup's cpu.max (buildcpu.ReadInForce, the tighter of its unit's and its slice's),
+// else the share the composer gave (buildcpu.ShareWord) over the machine's processors, else 0 and why none is known.
+func Quota() (percent int, from string) {
+	f := buildcpu.ReadInForce()
+	if f.Quota > 0 {
+		path := f.Slice.Path
+		if path == "" {
+			path = f.Cgroup
+		}
+		return f.Quota, "the cpu.max of " + path
+	}
+	if n, err := strconv.Atoi(strings.TrimSpace(os.Getenv(buildcpu.ShareWord))); err == nil && n >= 1 && n <= 100 {
+		return buildcpu.Quota(n, runtime.NumCPU()), fmt.Sprintf("the share %d%% the composer gave (%s), of %d processors; no cpu.max is read", n, buildcpu.ShareWord, runtime.NumCPU())
+	}
+	return 0, "no CPU quota: neither a cpu.max on its cgroup nor a share from the composer"
+}
+
+// EffectiveCapacity is the capacity a seat's holder judges by, from its configured capacity, its node's quota (percent of
+// one processor, 0 when none is known) and the cores one of its steps needs. Without a quota it is the configured one;
+// with one, min(configured, floor(quota cores / coresPerStep)), and one at least while the configured one is above
+// zero. A coresPerStep of zero or less is taken as 1.
+func EffectiveCapacity(configured, quotaPercent int, quotaFrom string, coresPerStep float64) delivery.Capacity {
+	if coresPerStep <= 0 || math.IsNaN(coresPerStep) || math.IsInf(coresPerStep, 0) {
+		coresPerStep = 1
+	}
+	c := delivery.Capacity{Configured: configured, Effective: configured, QuotaFrom: quotaFrom, CoresPerStep: coresPerStep}
+	switch {
+	case configured <= 0:
+		c.Effective = 0
+		c.Why = fmt.Sprintf("its configured capacity is %d, so it pulls nothing", configured)
+		return c
+	case quotaPercent <= 0:
+		c.Why = fmt.Sprintf("its configured capacity %d; %s, so the CPU bounds nothing", configured, quotaFrom)
+		return c
+	}
+	c.QuotaCores = float64(quotaPercent) / 100
+	c.ByCPU = int(math.Floor(c.QuotaCores/coresPerStep + 1e-9))
+	if c.ByCPU < 1 {
+		c.ByCPU = 1
+	}
+	byCPU := fmt.Sprintf("%g cores of the build slice (%s) / %g cores a step = %d", c.QuotaCores, quotaFrom, coresPerStep, c.ByCPU)
+	if c.ByCPU < configured {
+		c.Effective = c.ByCPU
+		c.Why = fmt.Sprintf("%d, bounded by the CPU: %s, under its configured %d", c.Effective, byCPU, configured)
+	} else {
+		c.Why = fmt.Sprintf("%d, its configured capacity; the CPU allows %s", configured, byCPU)
+	}
+	return c
+}
+
+// NodeCoresPerStep is the module's cores-per-step, read from its settings file at path at every call so a change is
+// followed at the next judgement; fallback when there is no path, no value or one that is not a number above zero, said
+// once per distinct fault through logf.
+func NodeCoresPerStep(path string, fallback float64, logf func(string, ...any)) func() float64 {
+	said := ""
+	say := func(why string) {
+		if logf != nil && why != said {
+			said = why
+			logf("%s, so a step is taken to need %g cores", why, fallback)
+		}
+	}
+	return func() float64 {
+		if path == "" {
+			return fallback
+		}
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			say(fmt.Sprintf("the setting %s cannot be read: %v", CoresPerStepSetting, err))
+			return fallback
+		}
+		var s map[string]json.RawMessage
+		if err := json.Unmarshal(raw, &s); err != nil {
+			say(fmt.Sprintf("the settings file %s is not JSON: %v", path, err))
+			return fallback
+		}
+		v, ok := s[CoresPerStepSetting]
+		if !ok {
+			return fallback // not declared yet (a module before its manifest names it): the default, nothing to say
+		}
+		n, err := coresOf(v)
+		if err != nil {
+			say(fmt.Sprintf("the setting %s %s: %v", CoresPerStepSetting, v, err))
+			return fallback
+		}
+		said = ""
+		return n
+	}
+}
+
+// coresOf reads a cores-per-step value: a JSON number or a string holding one, above zero.
+func coresOf(v json.RawMessage) (float64, error) {
+	var n float64
+	if err := json.Unmarshal(v, &n); err != nil {
+		var s string
+		if err := json.Unmarshal(v, &s); err != nil {
+			return 0, fmt.Errorf("is neither a number nor a string")
+		}
+		if n, err = strconv.ParseFloat(strings.TrimSpace(s), 64); err != nil {
+			return 0, fmt.Errorf("is not a number")
+		}
+	}
+	if n <= 0 || math.IsNaN(n) || math.IsInf(n, 0) {
+		return 0, fmt.Errorf("is not above zero")
+	}
+	return n, nil
+}

go/buildstep/capacity_test.go

@@ -3,36 +3,133 @@ package buildstep
 import (
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
+	"time"
 )
 
 // 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)
+// 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 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")
-	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)
+	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)
+		}
 	}
-	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 {
+	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)
+	}
+	t.Setenv("MESH_BUILD_CPU_SHARE", "75")
+	if l := NodeLimits(3); l.Percent != 75 || l.Slots != 3 || l.Threads < 1 {
+		t.Errorf("from the word: %+v", l)
+	}
+	for _, c := range []struct {
+		name              string
+		configured, quota int
+		cores             float64
+		effective, byCPU  int
+	}{
+		{"shanks: 12 cores, configured 3", 3, 1200, 6, 2, 2},
+		{"ace: 18 cores, configured 2", 2, 1800, 6, 2, 3},
+		{"g14: 8 cores, configured 2", 2, 800, 6, 1, 1},
+		{"node on shanks: 12 cores at 2", 3, 1200, 2, 3, 6},
+		{"no quota: the configured one", 3, 0, 6, 3, 0},
+		{"configured 0 pulls nothing", 0, 1200, 6, 0, 0},
+		{"a quota under one step still builds one", 2, 100, 6, 1, 1},
+		{"no cores a step is one", 2, 150, 0, 1, 1},
+	} {
+		got := EffectiveCapacity(c.configured, c.quota, "test", c.cores)
+		if got.Effective != c.effective || got.ByCPU != c.byCPU || got.Why == "" {
+			t.Errorf("%s: %+v, want effective %d, by CPU %d", c.name, got, c.effective, c.byCPU)
+		}
+	}
+	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":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)
+		}
+	}
+	if len(said) != 1 {
+		t.Errorf("a value not above zero is said once, said %d times", len(said))
+	}
+
+	// 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
+	defer func() { now = was }()
+	for _, c := range []struct {
+		name, setting, node string
+		at                  time.Time
+		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
+	}{
+		{"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 := ParseBuildWindow(c.setting)
+		if (err != nil) != c.bad {
+			t.Errorf("%s: parse %v", c.name, err)
+		}
+		if edge := ""; w != nil {
+			edge = w.NextEdge(c.at).Format("15:04")
+			if edge != c.edge {
+				t.Errorf("%s: next edge %s, want %s", c.name, edge, c.edge)
+			}
+		} else if c.edge != "" {
+			t.Errorf("%s: no window, want one", c.name)
+		}
+		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),
+			Eligible: func() string { return c.ineligible }}
+		got := p.CapacityDetail()
+		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"}
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+{"Time":"2026-10-25T15:35:21.010761822+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010764592+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010767992+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 61 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010771062+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010774282+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010779382+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010782942+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010785722+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010788573+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 62 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010791893+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010794943+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010798083+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010801683+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010804293+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010807283+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 63 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010810443+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010813553+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010816793+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010820233+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010823063+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010829493+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 64 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010832683+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010835953+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010839223+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010842463+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010845333+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010848423+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 65 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010851663+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010854964+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010858364+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010861714+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010864914+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010867984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 66 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010870944+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"Time":"2026-10-25T15:35:21.010874114+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
+{"Time":"2026-10-25T15:35:21.010877464+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
+{"Time":"2026-10-25T15:35:21.010880504+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
+{"Time":"2026-10-25T15:35:21.010883144+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.010886194+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 67 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.010889154+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
+{"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/cpu.go

@@ -0,0 +1,14 @@
+package buildstep
+
+import (
+	"os"
+
+	"git.novox.be/novox/mesh-sdk/go/buildcpu"
+)
+
+// NodeLimits is what one step of a build module is held to (novox/hq ADR 0553 §4): the node's processor share from the
+// word the composer gives the module (buildcpu.ShareWord), divided by the module's own capacity, own, over the machine's
+// processors. Without the word, no thread limit: Threads is 0.
+func NodeLimits(own int) buildcpu.Limits {
+	return buildcpu.FromWords(os.Getenv, own)
+}

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/fetch.go

@@ -71,7 +71,7 @@ func FetchCommit(ctx context.Context, run forgekey.Runner, dir, remote, commit,
 		full := append([]string{"-c", "credential.helper=", "-C", dir}, args...)
 		r := run(ctx, env, "git", full...)
 		if r.Status != 0 || r.Err != "" {
-			return "", fmt.Errorf("git %s: %s", args[0], firstLine(r.Err+" "+r.Stderr))
+			return "", fmt.Errorf("git %s: %s", args[0], forgekey.Said(r.Err+"\n"+r.Stderr))
 		}
 		return r.Stdout, nil
 	}
@@ -128,7 +128,11 @@ func UpdateMirror(ctx context.Context, run forgekey.Runner, mirror, remote, comm
 	git := func(args ...string) error {
 		r := run(ctx, env, "git", append([]string{"-c", "credential.helper="}, args...)...)
 		if r.Status != 0 || r.Err != "" {
-			return fmt.Errorf("git %s: %s", args[0], firstLine(r.Err+" "+r.Stderr))
+			verb := args[0]
+			if verb == "-C" && len(args) > 2 { // the mirror's commands are named by what they do, not by -C
+				verb = args[2]
+			}
+			return fmt.Errorf("git %s: %s", verb, forgekey.Said(r.Err+"\n"+r.Stderr))
 		}
 		return nil
 	}
@@ -190,12 +194,3 @@ func checkFetch(o fetchOptions, dir, remote, commit, ref string) error {
 	}
 	return nil
 }
-
-func firstLine(s string) string {
-	for _, l := range strings.Split(s, "\n") {
-		if l = strings.TrimSpace(l); l != "" {
-			return l
-		}
-	}
-	return ""
-}

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/merge.go

@@ -15,6 +15,9 @@ type MergeResult struct {
 	Base, Head, Merge string
 	Conflicts         []string
 	Changed           []string
+	// Programs are the changed files that are compiled programs (ExecutableKind of their first bytes, read in the workspace
+	// at the merge); never nil for a clean merge, so a caller tells none from a module that reports none (issue 1577).
+	Programs []Program
 }
 
 // MergeInto makes, in the workspace dir that FetchCommit left at commit, the merge of commit into the trunk commit
@@ -52,7 +55,7 @@ func MergeInto(ctx context.Context, run forgekey.Runner, dir, remote, base, comm
 		full := append([]string{"-c", "credential.helper=", "-C", dir}, args...)
 		r := run(ctx, env, "git", full...)
 		if r.Status != 0 || r.Err != "" {
-			return "", fmt.Errorf("git %s: %s", args[0], firstLine(r.Err+" "+r.Stderr))
+			return "", fmt.Errorf("git %s: %s", args[0], forgekey.Said(r.Err+"\n"+r.Stderr))
 		}
 		return r.Stdout, nil
 	}
@@ -98,6 +101,16 @@ func MergeInto(ctx context.Context, run forgekey.Runner, dir, remote, base, comm
 		return res, fmt.Errorf("the paths the merge changes cannot be read: %w", err)
 	}
 	res.Changed = strings.Fields(changed)
+	raw, err := git("diff", "--raw", "-z", "--no-renames", "--diff-filter=AM", base, res.Merge)
+	if err != nil {
+		return res, fmt.Errorf("the files the merge adds or modifies cannot be read: %w", err)
+	}
+	res.Programs = programsIn(dir, raw)
+	history, err := historyPrograms(git, base, commit, res.Programs)
+	if err != nil {
+		return res, fmt.Errorf("the commits of the branch cannot be read for compiled programs: %w", err)
+	}
+	res.Programs = append(res.Programs, history...)
 	return res, nil
 }
 

go/buildstep/merge_integration_test.go

@@ -79,6 +79,30 @@ func (r *mergeRig) head(files map[string]string) string {
 	return h
 }
 
+// headThatAddsAndRemoves is head with an earlier commit on the branch that adds a program and a later one that removes it: the
+// branch's tree is clean, its history is not. It answers the head and the earlier commit.
+func (r *mergeRig) headThatAddsAndRemoves(files map[string]string) (head, added string) {
+	realGit(r.t, r.work, "checkout", "-q", "-B", "pr", r.fork)
+	writeFile(r.t, r.work, "gone/prog", "\x7fELF\x02\x01")
+	realGit(r.t, r.work, "add", ".")
+	realGit(r.t, r.work, "commit", "-q", "-m", "oops")
+	added = realGit(r.t, r.work, "rev-parse", "HEAD")
+	realGit(r.t, r.work, "rm", "-q", "gone/prog")
+	return r.head2(files), added
+}
+
+// head2 commits files on the current branch and pushes it as the pull request's head.
+func (r *mergeRig) head2(files map[string]string) string {
+	for n, c := range files {
+		writeFile(r.t, r.work, n, c)
+	}
+	realGit(r.t, r.work, "add", ".")
+	realGit(r.t, r.work, "commit", "-q", "-m", "head")
+	h := realGit(r.t, r.work, "rev-parse", "HEAD")
+	realGit(r.t, r.work, "push", "-q", r.bare, "HEAD:refs/pull/1/head")
+	return h
+}
+
 // advance moves the trunk past the fork point with a commit changing files, pushes it and answers its sha.
 func (r *mergeRig) advance(files map[string]string) string {
 	realGit(r.t, r.work, "checkout", "-q", "-B", "main", r.fork)
@@ -102,7 +126,7 @@ func (r *mergeRig) fetch(head string) {
 // holds both sides' changes.
 func TestMergeIntoACleanMergeAnswersTheMergeCommitAndTheChangedFiles(t *testing.T) {
 	r := newMergeRig(t)
-	head := r.head(map[string]string{"b.txt": "head\n"})
+	head, added := r.headThatAddsAndRemoves(map[string]string{"b.txt": "head\n", "prog": "\x7fELF\x02\x01"})
 	base := r.advance(map[string]string{"a.txt": "one\ntwo\nthree\nfour\n"})
 	r.fetch(head)
 	res, err := MergeInto(context.Background(), forgekey.ExecRunner, r.ws, r.remote, base, head, AllowFileRemote())
@@ -112,8 +136,11 @@ func TestMergeIntoACleanMergeAnswersTheMergeCommitAndTheChangedFiles(t *testing.
 	if res.Base != base || res.Head != head || len(res.Merge) != 40 || res.Merge == base || res.Merge == head || len(res.Conflicts) != 0 {
 		t.Fatalf("result = %+v", res)
 	}
-	if !reflect.DeepEqual(res.Changed, []string{"b.txt"}) {
-		t.Errorf("changed = %v, want only what the head adds to the trunk: b.txt", res.Changed)
+	if !reflect.DeepEqual(res.Changed, []string{"b.txt", "prog"}) {
+		t.Errorf("changed = %v, want only what the head adds to the trunk: b.txt, prog", res.Changed)
+	}
+	if !reflect.DeepEqual(res.Programs, []Program{{"prog", "ELF", ""}, {"gone/prog", "ELF", added}}) { // issue 1577
+		t.Errorf("programs = %v, want the ELF the head adds and the one an earlier commit added and a later one removed", res.Programs)
 	}
 	if at := realGit(t, r.ws, "rev-parse", "HEAD"); at != res.Merge {
 		t.Errorf("the workspace is at %s, not at the merge %s", at, res.Merge)

go/buildstep/mirror_test.go

@@ -104,3 +104,21 @@ func TestUpdateMirrorRefusesBeforeRunning(t *testing.T) {
 		t.Errorf("ran %v", f.calls)
 	}
 }
+
+// The forge's refusal reaches the reason in git's own words: the mirror of a repository its account cannot read said
+// only "git -C: error:" (2026-10-26), since git writes a bare "error:" line before the forge's message.
+func TestUpdateMirrorSaysTheForgesRefusal(t *testing.T) {
+	f := &fakeGit{}
+	f.rule = func(args string) (r forgekey.Ran) {
+		if strings.Contains(args, "fetch") {
+			r.Status = 128
+			r.Stderr = "error: \nerror: User: 22:nox-builder with Key: 30:mesh:ace.mesh-build-go is not authorized to read o/r.\nerror: \nfatal: Could not read from remote repository.\n"
+		}
+		return
+	}
+	err := UpdateMirror(context.Background(), f.run, filepath.Join(t.TempDir(), "m.git"), "ssh://mesh-forge/o/r.git", sha, "")
+	if err == nil || !strings.Contains(err.Error(), "nox-builder with Key: 30:mesh:ace.mesh-build-go is not authorized to read o/r.") ||
+		!strings.Contains(err.Error(), "Could not read from remote repository") || !strings.HasPrefix(err.Error(), "git fetch: ") {
+		t.Errorf("err = %v", err)
+	}
+}

go/buildstep/phase.go

@@ -0,0 +1,67 @@
+package buildstep
+
+import (
+	"context"
+	"strings"
+	"sync"
+	"time"
+
+	"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 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
+// time since the start, and written to the ask's running step key (delivery.Step.Phase), so its asker and the delivery
+// view read where it stands from the bus.
+
+type phaseKey struct{}
+
+// Phase says that the ask whose run ctx belongs to entered phase; nothing outside an ask's run (a tool called by hand).
+func Phase(ctx context.Context, phase string) {
+	if r, ok := ctx.Value(phaseKey{}).(*phases); ok && r != nil {
+		r.enter(strings.TrimSpace(phase))
+	}
+}
+
+// phases is one running ask's reporter: it writes the step key again with each new phase until the step ends.
+type phases struct {
+	mu     sync.Mutex
+	put    Put
+	key    string
+	step   delivery.Step
+	ended  bool
+	logf   func(format string, args ...any)
+	prefix string
+}
+
+func (r *phases) enter(phase string) {
+	if phase == "" {
+		return
+	}
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.ended || phase == r.step.Phase {
+		return
+	}
+	at := now().UTC()
+	r.step.Phase, r.step.PhaseAt = phase, at
+	if r.logf != nil {
+		r.logf("%s: %s, %s after its start", r.prefix, phase, at.Sub(r.step.Started).Round(time.Second))
+	}
+	if r.put == nil {
+		return
+	}
+	if err := write(r.put, r.key, r.step); err != nil && r.logf != nil {
+		r.logf("%s: the phase %s could not be written to %s: %v", r.prefix, phase, r.key, err)
+	}
+}
+
+// end stops the writes (the step's end is written after it) and answers the step with its last phase, for the end.
+func (r *phases) end() delivery.Step {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.ended = true
+	return r.step
+}

go/buildstep/programs.go

@@ -0,0 +1,115 @@
+package buildstep
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Program is a changed file whose first bytes are an executable binary: a compiled program, which is build output and not
+// source (novox/hq issue 1577: `go build` in a module's folder writes one beside go.mod, and `git add -A` takes it).
+type Program struct {
+	Path string `json:"path"`
+	Kind string `json:"kind"` // ELF, Mach-O or PE
+	// Commit is set for a program a commit of the branch added and a later one removed (or replaced): the merge's tree is clean,
+	// but the merge commit carries the blob into the trunk's history for good. Empty for a program the merge's tree holds.
+	Commit string `json:"commit,omitempty"`
+}
+
+// ExecutableKind says what executable format the first bytes of a file are, or "" when they are none. A PE needs its header
+// ("PE\0\0" at the offset in bytes 0x3c) so a text starting with "MZ" is not one; a fat Mach-O (0xCAFEBABE) is told from a
+// Java class by its architecture count (bytes 4 to 7, fewer than 0x20; a class has its version there).
+func ExecutableKind(head []byte) string {
+	switch {
+	case bytes.HasPrefix(head, []byte("\x7fELF")):
+		return "ELF"
+	case bytes.HasPrefix(head, []byte("MZ")):
+		if len(head) >= 0x40 {
+			off := int(head[0x3c]) | int(head[0x3d])<<8 | int(head[0x3e])<<16 | int(head[0x3f])<<24
+			if off >= 0 && off+4 <= len(head) && bytes.Equal(head[off:off+4], []byte("PE\x00\x00")) {
+				return "PE"
+			}
+		}
+	case bytes.HasPrefix(head, []byte{0xcf, 0xfa, 0xed, 0xfe}), bytes.HasPrefix(head, []byte{0xce, 0xfa, 0xed, 0xfe}),
+		bytes.HasPrefix(head, []byte{0xfe, 0xed, 0xfa, 0xcf}), bytes.HasPrefix(head, []byte{0xfe, 0xed, 0xfa, 0xce}),
+		bytes.HasPrefix(head, []byte{0xca, 0xfe, 0xba, 0xbe}) && len(head) >= 8 && head[4] == 0 && head[5] == 0 && head[6] == 0 && head[7] < 0x20:
+		return "Mach-O"
+	}
+	return ""
+}
+
+// programHeadSize is how many bytes of a file are read to tell its format: enough for a PE header at its usual offsets.
+const programHeadSize = 0x100
+
+// historyPrograms names the compiled programs that a commit of base..head added or modified and the merge's tree no longer
+// holds at that path (those it holds are in final already): each with the commit that added it. git is the merge's git runner.
+func historyPrograms(git func(args ...string) (string, error), base, head string, final []Program) ([]Program, error) {
+	revs, err := git("rev-list", "--no-merges", "--reverse", base+".."+head)
+	if err != nil {
+		return nil, err
+	}
+	held := map[string]bool{}
+	for _, p := range final {
+		held[p.Path] = true
+	}
+	out, seen := []Program{}, map[string]bool{}
+	for _, c := range strings.Fields(revs) {
+		raw, err := git("diff-tree", "-r", "-z", "--no-commit-id", "--no-renames", "--root", "--diff-filter=AM", c)
+		if err != nil {
+			return nil, err
+		}
+		f := strings.Split(raw, "\x00")
+		for i := 0; i+1 < len(f); i += 2 {
+			meta := strings.Fields(strings.TrimPrefix(f[i], ":"))
+			if len(meta) < 4 || (meta[1] != "100644" && meta[1] != "100755") || held[f[i+1]] || seen[meta[3]] {
+				continue
+			}
+			seen[meta[3]] = true
+			blob, err := git("cat-file", "blob", meta[3])
+			if err != nil {
+				return nil, err
+			}
+			head := []byte(blob)
+			if len(head) > programHeadSize {
+				head = head[:programHeadSize]
+			}
+			if k := ExecutableKind(head); k != "" {
+				out = append(out, Program{Path: f[i+1], Kind: k, Commit: c})
+			}
+		}
+	}
+	return out, nil
+}
+
+// programsIn reads the output of `git diff --raw -z --no-renames --diff-filter=AM` (":<old mode> <new mode> <old sha> <new
+// sha> <status>\0<path>\0" per file) and names each added or modified regular file of the tree dir that is a compiled
+// program, from its first bytes read locally. A symlink (mode 120000) and a submodule (160000) are not read. It never
+// answers nil, so a caller can tell no programs from none reported.
+func programsIn(dir, raw string) []Program {
+	out := []Program{}
+	f := strings.Split(raw, "\x00")
+	for i := 0; i+1 < len(f); i += 2 {
+		meta := strings.Fields(strings.TrimPrefix(f[i], ":"))
+		if len(meta) < 2 || (meta[1] != "100644" && meta[1] != "100755") {
+			continue
+		}
+		p := f[i+1]
+		full := filepath.Join(dir, filepath.FromSlash(p))
+		if st, err := os.Lstat(full); err != nil || !st.Mode().IsRegular() {
+			continue
+		}
+		fh, err := os.Open(full)
+		if err != nil {
+			continue
+		}
+		head := make([]byte, programHeadSize)
+		n, _ := io.ReadFull(fh, head)
+		fh.Close()
+		if k := ExecutableKind(head[:n]); k != "" {
+			out = append(out, Program{Path: p, Kind: k})
+		}
+	}
+	return out
+}

go/buildstep/programs_test.go

@@ -0,0 +1,72 @@
+package buildstep
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func pe(offset int, magic string) []byte {
+	b := make([]byte, 0x100)
+	copy(b, "MZ")
+	b[0x3c] = byte(offset)
+	copy(b[offset:], magic)
+	return b
+}
+
+func TestExecutableKindTellsProgramsFromText(t *testing.T) { // issue 1577
+	for _, c := range []struct {
+		name string
+		head []byte
+		want string
+	}{
+		{"elf", []byte("\x7fELF\x02\x01\x01"), "ELF"},
+		{"mach-o 64", []byte{0xcf, 0xfa, 0xed, 0xfe, 7, 0, 0, 1}, "Mach-O"},
+		{"mach-o 32 big", []byte{0xfe, 0xed, 0xfa, 0xce, 0, 0, 0, 7}, "Mach-O"},
+		{"fat mach-o", []byte{0xca, 0xfe, 0xba, 0xbe, 0, 0, 0, 2}, "Mach-O"},
+		{"java class", []byte{0xca, 0xfe, 0xba, 0xbe, 0, 0, 0, 0x34}, ""},
+		{"pe", pe(0x80, "PE\x00\x00"), "PE"},
+		{"mz text", []byte("MZ is a text file starting with two letters"), ""},
+		{"mz without a pe header", pe(0x80, "XX\x00\x00"), ""},
+		{"text", []byte("package main"), ""},
+		{"empty", nil, ""},
+	} {
+		if got := ExecutableKind(c.head); got != c.want {
+			t.Errorf("%s: kind = %q, want %q", c.name, got, c.want)
+		}
+	}
+}
+
+func TestProgramsInNamesTheAddedAndModifiedRegularFilesThatArePrograms(t *testing.T) { // issue 1577
+	dir := t.TempDir()
+	write := func(name string, b []byte) {
+		if err := os.MkdirAll(filepath.Dir(filepath.Join(dir, name)), 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(filepath.Join(dir, name), b, 0o755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	write("m/prog", []byte("\x7fELF\x02\x01"))
+	write("m/notes", []byte("plain text"))
+	write("m/mac", []byte{0xcf, 0xfa, 0xed, 0xfe, 7, 0, 0, 1})
+	if err := os.Symlink("prog", filepath.Join(dir, "m/link")); err != nil {
+		t.Fatal(err)
+	}
+	line := func(mode, path string) string { return ":000000 " + mode + " 0000 1111 A\x00" + path + "\x00" }
+	for _, c := range []struct {
+		name, raw string
+		want      []Program
+	}{
+		{"none", "", []Program{}},
+		{"a program and a text", line("100755", "m/prog") + line("100644", "m/notes"), []Program{{"m/prog", "ELF", ""}}},
+		{"two programs", line("100644", "m/prog") + line("100755", "m/mac"), []Program{{"m/prog", "ELF", ""}, {"m/mac", "Mach-O", ""}}},
+		{"a symlink and a submodule are not read", line("120000", "m/link") + line("160000", "m/sub"), []Program{}},
+		{"a path the tree lacks", line("100644", "m/gone"), []Program{}},
+	} {
+		if got := programsIn(dir, c.raw); !reflect.DeepEqual(got, c.want) {
+			t.Errorf("%s: programs = %v, want %v", c.name, got, c.want)
+		}
+	}
+}

go/buildstep/pull.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"sort"
+	"strings"
 	"sync"
 	"time"
 
@@ -76,6 +77,27 @@ type Puller struct {
 	// for this node, and wakes the puller on each change (watchCapacity): WatchConfigServed in a module, a test's own
 	// double. Until it hands a value the puller judges by Capacity.
 	WatchConfig func(key string, handle func(stdio.ProvisionChange) error) error
+	// CoresPerStep is what one ask of this module needs, read at every judgement (NodeCoresPerStep); with it the capacity
+	// judged by is bounded by the node's build slice: min(the configured capacity, floor(the quota's cores / CoresPerStep))
+	// (EffectiveCapacity). Nil bounds nothing by the CPU. Quota reads the quota (Quota when nil; a test's own).
+	CoresPerStep func() float64
+	Quota        func() (percent int, from string)
+	// BuildHours is the node's build window, read at every judgement (NodeBuildHours); with WatchConfig set the value
+	// 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
+	// does not take the asker's next copy at once. Nil has nothing.
+	Has func(need string) bool
 
 	mu      sync.Mutex
 	inHand  int
@@ -86,6 +108,19 @@ type Puller struct {
 	// watched is the capacity the config watch handed last, used in place of Capacity once hasWatched.
 	watched    int
 	hasWatched bool
+	// hours is the build window the config watch handed last, and hoursFault why its value cannot be read; used in place
+	// of BuildHours once hasHours.
+	hours      *BuildWindow
+	hoursFault string
+	hasHours   bool
+	// judged is the capacity said last (log and capacity.<node>), so a change is said once.
+	judged     delivery.Capacity
+	hasJudged  bool
+	capWritten bool
+	capFault   string
+	// declined are the kinds whose worker handed an ask this node declined, left out of the pulls without a wait until
+	// the next pull's wait ends.
+	declined map[string]bool
 }
 
 func (p *Puller) init() {
@@ -207,23 +242,136 @@ func (p *Puller) room() bool {
 
 // roomNow is room, with the capacity and the asks in hand it was judged on.
 func (p *Puller) roomNow() (ok bool, capacity, inHand int) {
-	p.mu.Lock()
-	watched, has := p.watched, p.hasWatched
-	p.mu.Unlock()
-	if has {
-		capacity = watched
-	} else if p.Capacity != nil {
-		capacity = p.Capacity()
-	}
+	capacity = p.CapacityDetail().Effective
 	p.mu.Lock()
 	defer p.mu.Unlock()
 	return !p.paused && p.inHand < capacity, capacity, p.inHand
 }
 
-// CapacityNow is the capacity the puller judges by: the config watch's last value, else Capacity.
+// CapacityNow is the capacity the puller judges by (CapacityDetail's Effective).
 func (p *Puller) CapacityNow() int {
-	_, capacity, _ := p.roomNow()
-	return capacity
+	return p.CapacityDetail().Effective
+}
+
+// CapacityDetail is the capacity the puller judges by now and why: the configured one (the config watch's last value,
+// else Capacity), bounded by the node's build slice when CoresPerStep is set (EffectiveCapacity), its quota read now. A
+// change from what it said last is logged and written to `capacity.<node>` of the pauses state (PausePut), so the
+// delivery view says it too.
+func (p *Puller) CapacityDetail() delivery.Capacity {
+	p.mu.Lock()
+	watched, has := p.watched, p.hasWatched
+	p.mu.Unlock()
+	configured, from := 0, "the settings file"
+	switch {
+	case has:
+		configured, from = watched, "mesh-config, as the config watch handed it"
+	case p.Capacity != nil:
+		configured = p.Capacity()
+	}
+	var c delivery.Capacity
+	if p.CoresPerStep == nil {
+		c = delivery.Capacity{Configured: configured, Effective: configured, QuotaFrom: "not judged: the module names no cores a step needs",
+			Why: fmt.Sprintf("its configured capacity %d", configured)}
+	} else {
+		quota := p.Quota
+		if quota == nil {
+			quota = Quota
+		}
+		percent, qfrom := quota()
+		c = EffectiveCapacity(configured, percent, qfrom, p.CoresPerStep())
+	}
+	c.ConfiguredFrom = from
+	w, fault := p.window()
+	if fault != "" {
+		c.BuildHoursFault = fault
+		c.Why = fmt.Sprintf("%s; at any hour, because its build hours cannot be read: %s", c.Why, fault)
+	}
+	if w != nil {
+		at := now()
+		zone, _ := at.Zone()
+		c.BuildHours = w.String() + " " + zone
+		if !w.Open(at) && c.Effective > 0 {
+			c.OutsideHours = true
+			c.Why = fmt.Sprintf("0, outside its build hours %s until %s (otherwise %s)", c.BuildHours, w.NextEdge(at).Format("15:04"), c.Why)
+			c.Effective = 0
+		} else if c.Effective > 0 {
+			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
+}
+
+// window is the node's build window now (the config watch's last value, else BuildHours, else none), and why its value
+// cannot be read when it cannot.
+func (p *Puller) window() (*BuildWindow, string) {
+	p.mu.Lock()
+	w, fault, has := p.hours, p.hoursFault, p.hasHours
+	p.mu.Unlock()
+	if has {
+		return w, fault
+	}
+	if p.BuildHours != nil {
+		return p.BuildHours()
+	}
+	return nil, ""
+}
+
+// untilEdge is how long until the build window's next edge, and false when the node has no window.
+func (p *Puller) untilEdge() (time.Duration, bool) {
+	w, _ := p.window()
+	if w == nil {
+		return 0, false
+	}
+	at := now()
+	return w.NextEdge(at).Sub(at), true
+}
+
+// sayCapacity logs c when it differs from what was said last, and writes it to the node's capacity key until a write
+// lands (a failed write is tried again at the next judgement, its error said once).
+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.Ineligible == c.Ineligible
+	if !same {
+		p.judged, p.hasJudged, p.capWritten = c, true, false
+	}
+	write := !p.capWritten && p.PausePut != nil
+	p.mu.Unlock()
+	if !same {
+		p.logf("the %s build capacity of %s is %s (configured from %s)", p.Language, p.Node, c.Why, c.ConfiguredFrom)
+	}
+	if !write {
+		return
+	}
+	key, err := delivery.CapacityKey(p.Node)
+	if err != nil {
+		return
+	}
+	c.At = now()
+	raw, err := delivery.EncodeCapacity(c)
+	if err == nil {
+		_, err = p.PausePut(key, json.RawMessage(raw))
+	}
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	if err == nil {
+		p.capWritten, p.capFault = true, ""
+		return
+	}
+	if err.Error() != p.capFault {
+		p.capFault = err.Error()
+		p.logf("the %s build capacity of %s could not be written to %s (tried again at the next judgement): %v", p.Language, p.Node, key, err)
+	}
 }
 
 // Pull takes and runs asks until ctx ends. An ask still running then is neither ended nor acknowledged: the stream
@@ -239,6 +387,7 @@ func (p *Puller) Pull(ctx context.Context) error {
 		p.logf("the pause of %s cannot be read: %v; pulling as not paused", p.Node, err)
 	}
 	go p.watchCapacity() // WatchConfigServed waits for Serve, which a module starts after its pull
+	go p.watchHours()
 	wait := p.PullWait
 	if wait <= 0 {
 		wait = DefaultPullWait
@@ -251,16 +400,29 @@ func (p *Puller) Pull(ctx context.Context) error {
 			// Parked until something wakes it: a capacity change (the config watch), a resume, or a step's end. Every
 			// park logs once, so a puller that sits idle says why (issue 1887).
 			p.logf("the %s puller on %s parks: %d of capacity %d in hand, paused %v", p.Language, p.Node, inHand, capacity, p.Paused())
+			var edge <-chan time.Time // the build window's next edge, when the node has one: one timer, not a poll
+			stop := func() bool { return false }
+			if d, ok := p.untilEdge(); ok {
+				t := time.NewTimer(d + time.Second)
+				edge, stop = t.C, t.Stop
+			}
 			select {
 			case <-ctx.Done():
+				stop()
 				return ctx.Err()
 			case <-p.wake:
+			case <-edge:
 			}
+			stop()
 			_, capacity, inHand = p.roomNow()
 			p.logf("the %s puller on %s wakes: %d of capacity %d in hand, paused %v", p.Language, p.Node, inHand, capacity, p.Paused())
 			continue
 		}
-		msg, err := p.next(ctx, wait)
+		pullWait := wait
+		if d, ok := p.untilEdge(); ok && d < pullWait {
+			pullWait = d // a pull does not wait past the window's close
+		}
+		msg, err := p.next(ctx, pullWait)
 		if err != nil {
 			if ctx.Err() != nil {
 				return ctx.Err()
@@ -283,17 +445,59 @@ func (p *Puller) Pull(ctx context.Context) error {
 
 // next is one ask from the workers in their order: one already waiting on delivery, check or recheck, and when none
 // waits, a pull of the delivery worker that waits for one.
+//
+// A kind whose worker handed an ask this node declined is left out until that wait ended (issue 890): the pull's own
+// wait, no timer of its own.
 func (p *Puller) next(ctx context.Context, wait time.Duration) (*Pulled, error) {
+	p.mu.Lock()
+	declined := p.declined
+	p.mu.Unlock()
 	for _, kind := range delivery.AskKinds {
+		if declined[kind] {
+			continue
+		}
 		msg, err := p.Source.Next(ctx, kind, 0)
 		if err != nil || msg != nil {
 			return withKind(msg, kind), err
 		}
 	}
 	msg, err := p.Source.Next(ctx, delivery.AskDelivery, wait)
+	p.mu.Lock()
+	p.declined = nil
+	p.mu.Unlock()
 	return withKind(msg, delivery.AskDelivery), err
 }
 
+// decline ends the step of an ask this node lacks a need of, refused as declined with what it lacks, and drops the
+// message: the asker puts the ask again under a new id (issue 890). A message whose decline cannot be written is handed
+// back, as one whose start cannot be.
+func (p *Puller) decline(msg *Pulled, ask delivery.StepAsk, lacks []string) {
+	step, key, err := begin(p.Put, p.Node, ask.Kind+" ask", ask.ID, AskWhat(ask))
+	if err == nil {
+		why := Refuse("the ask %s needs %s, and %s lacks %s: it is left to a node that has it", ask.ID,
+			strings.Join(ask.Needs, ", "), p.Node, strings.Join(lacks, ", "))
+		step.Ended = now().UTC()
+		step.State, step.Reason = delivery.StepRefused, why.Error()
+		step.Result, err = json.Marshal(delivery.StepDeclined{Declined: true, Needs: ask.Needs, Lacks: lacks})
+		if err == nil {
+			err = writeEnd(p.Put, key, step)
+		}
+	}
+	if err != nil {
+		p.logf("the ask %s cannot be declined on %s, so it is given back: %v", ask.ID, p.Node, err)
+		_ = msg.Nak()
+		return
+	}
+	p.logf("the ask %s is declined on %s: it needs %s, and this node lacks %s", ask.ID, p.Node, strings.Join(ask.Needs, ", "), strings.Join(lacks, ", "))
+	_ = msg.Term()
+	p.mu.Lock()
+	if p.declined == nil {
+		p.declined = map[string]bool{}
+	}
+	p.declined[msg.Kind] = true
+	p.mu.Unlock()
+}
+
 func withKind(msg *Pulled, kind string) *Pulled {
 	if msg != nil {
 		msg.Kind = kind
@@ -314,7 +518,11 @@ func (p *Puller) take(ctx context.Context, msg *Pulled) {
 		_ = msg.Term()
 		return
 	}
-	step, key, err := begin(p.Put, p.Node, ask.Kind+" ask", ask.ID)
+	if lacks := delivery.Lacks(ask.Needs, p.Has); len(lacks) > 0 {
+		p.decline(msg, ask, lacks)
+		return
+	}
+	step, key, err := begin(p.Put, p.Node, ask.Kind+" ask", ask.ID, AskWhat(ask))
 	if err != nil {
 		p.logf("the ask %s cannot start on %s: %v", ask.ID, p.Node, err)
 		_ = msg.Nak()
@@ -340,6 +548,7 @@ func (p *Puller) take(ctx context.Context, msg *Pulled) {
 	}
 	p.running[ask.ID] = RunningAsk{ID: ask.ID, Kind: ask.Kind, Module: module, Started: step.Started}
 	p.mu.Unlock()
+	p.logf("the %s ask %s starts on %s: %s", ask.Kind, ask.ID, p.Node, step.What)
 	go p.run(ctx, msg, ask, key, step)
 }
 
@@ -370,7 +579,11 @@ func (p *Puller) run(ctx context.Context, msg *Pulled, ask delivery.StepAsk, key
 			}
 		}
 	}()
-	result, err := protect(ctx, func(ctx context.Context) (any, error) { return p.Run(ctx, ask) })
+	ph := &phases{put: p.Put, key: key, step: step, logf: p.Logf, prefix: fmt.Sprintf("the %s ask %s on %s", ask.Kind, ask.ID, p.Node)}
+	result, err := protect(ctx, func(ctx context.Context) (any, error) {
+		return p.Run(context.WithValue(ctx, phaseKey{}, ph), ask)
+	})
+	step = ph.end() // its end keeps the phase it ended in
 	close(done)
 	if ctx.Err() != nil {
 		// The process stops: the ask is neither ended nor acknowledged here, so the stream gives it to a node that runs.
@@ -383,12 +596,21 @@ func (p *Puller) run(ctx context.Context, msg *Pulled, ask delivery.StepAsk, key
 		_ = msg.Nak()
 		return
 	}
+	outcome := "passed"
+	if err != nil {
+		outcome = "did not pass: " + err.Error()
+		if len(outcome) > 300 {
+			outcome = outcome[:300] + "..."
+		}
+	}
+	p.logf("the %s ask %s ended on %s after %s, in its phase %q; %s", ask.Kind, ask.ID, p.Node,
+		now().Sub(step.Started).Round(time.Second), step.Phase, outcome)
 	if aerr := msg.Ack(); aerr != nil {
 		p.logf("the ask %s ended on %s and its acknowledgement failed: %v", ask.ID, p.Node, aerr)
 	}
 }
 
-// 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
@@ -419,6 +641,42 @@ func (p *Puller) watchCapacity() {
 	}
 }
 
+// watchHours follows the module's config value `build-hours` when WatchConfig and BuildHours are set, as watchCapacity
+// follows `capacity`: each value handed is kept, used in place of BuildHours, and wakes the puller. A value that cannot
+// be read is no window, said; a watch that cannot start leaves the puller on BuildHours, said once.
+func (p *Puller) watchHours() {
+	if p.WatchConfig == nil || p.BuildHours == nil {
+		return
+	}
+	err := p.WatchConfig(BuildHoursSetting, func(c stdio.ProvisionChange) error {
+		setting := ""
+		var w *BuildWindow
+		var why string
+		switch {
+		case c.Refused != "":
+			why = "its build hours are no longer answered: " + c.Refused
+		case len(c.Value) > 0 && string(c.Value) != "null" && json.Unmarshal(c.Value, &setting) != nil:
+			why = fmt.Sprintf("the setting %s %s is not a string", BuildHoursSetting, c.Value)
+		default:
+			var err error
+			if w, err = ParseBuildWindow(setting); err != nil {
+				why = err.Error()
+			}
+		}
+		p.mu.Lock()
+		p.hours, p.hoursFault, p.hasHours = w, why, true
+		p.mu.Unlock()
+		if why != "" {
+			p.logf("the %s puller on %s builds at any hour: %s", p.Language, p.Node, why)
+		}
+		p.Wake()
+		return nil
+	})
+	if err != nil {
+		p.logf("the %s build hours of %s cannot be followed on the bus, so they are read from the settings file: %v", p.Language, p.Node, err)
+	}
+}
+
 // WatchConfigServed is stdio.WatchConfig once Serve has the runtime's channel (stdio.Served): a build module starts its
 // pull before it serves, and a watch asked before that would be refused.
 func WatchConfigServed(key string, handle func(stdio.ProvisionChange) error) error {
@@ -431,13 +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

@@ -104,20 +104,38 @@ func TestPullTakesDeliveryBeforeCheck(t *testing.T) {
 }
 
 // 1887/A2a, 1887/AC-pull: given capacity 2 and three asks waiting, two run and the third waits, and it starts when
-// one ends, with no timer.
+// one ends, with no timer. Issue 1806's follow-up: the 2 is the CPU's, a configured 3 bounded by a 12-core slice at 6
+// cores a step, said once in capacity.<node>; and issue 1890: a run's phase is written to its step key and logged with
+// its ask id, and its end keeps the last phase.
 func TestPullHoldsAtMostItsCapacity(t *testing.T) {
 	src, st := NewFakeAsks(), newSteps()
+	asks := []delivery.StepAsk{}
 	for i := 0; i < 3; i++ {
-		_ = src.PublishAsk(testAsk(delivery.AskDelivery))
+		a := testAsk(delivery.AskDelivery)
+		asks = append(asks, a)
+		_ = src.PublishAsk(a)
 	}
 	release := make(chan struct{})
 	var mu sync.Mutex
 	started := 0
-	p := &Puller{Source: src, Language: delivery.AskGo, Node: "shanks", Put: st.put, Capacity: func() int { return 2 },
+	var said []string
+	capacities := map[string][]byte{}
+	quota := 1200
+	p := &Puller{Source: src, Language: delivery.AskGo, Node: "shanks", Put: st.put, Capacity: func() int { return 3 },
+		CoresPerStep: func() float64 { return 6 },
+		Quota:        func() (int, string) { mu.Lock(); defer mu.Unlock(); return quota, "a test's slice" },
+		PausePut: func(key string, v any) (uint64, error) {
+			mu.Lock()
+			capacities[key] = v.(json.RawMessage)
+			mu.Unlock()
+			return 1, nil
+		},
+		Logf:     func(f string, a ...any) { mu.Lock(); said = append(said, fmt.Sprintf(f, a...)); mu.Unlock() },
 		PullWait: 10 * time.Millisecond, Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			mu.Lock()
 			started++
 			mu.Unlock()
+			Phase(ctx, "unit: tests of 3 packages")
 			<-release
 			return nil, nil
 		}}
@@ -129,31 +147,87 @@ func TestPullHoldsAtMostItsCapacity(t *testing.T) {
 	if p.InHand() != 2 || src.Waiting(delivery.AskDelivery) != 1 {
 		t.Fatalf("in hand %d, waiting %d; want 2 and 1", p.InHand(), src.Waiting(delivery.AskDelivery))
 	}
+	c := p.CapacityDetail()
+	if c.Effective != 2 || c.Configured != 3 || c.ByCPU != 2 || c.QuotaCores != 12 || !strings.Contains(c.Why, "bounded by the CPU") {
+		t.Fatalf("the capacity judged by = %+v, want 2 of a configured 3 bounded by 12 cores / 6", c)
+	}
+	mu.Lock()
+	raw := capacities["capacity.shanks"]
+	capLines := 0
+	for _, l := range said {
+		if strings.Contains(l, "build capacity of shanks is 2, bounded by the CPU") {
+			capLines++
+		}
+	}
+	mu.Unlock()
+	if got, err := delivery.DecodeCapacity(raw); err != nil || got.Effective != 2 || capLines != 1 {
+		t.Fatalf("capacity.shanks = %s (%v), said %d times; want effective 2, said once", raw, err, capLines)
+	}
+	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() && s.Owner == Owner // 1890/AC5
+	})
 	release <- struct{}{}
 	waitFor(t, "the third taken", func() bool { return src.Waiting(delivery.AskDelivery) == 0 })
 	// Taken from the source comes a moment before its run starts: wait for the start, not only the take.
 	waitFor(t, "the third started", func() bool { mu.Lock(); defer mu.Unlock(); return started == 3 })
 	close(release)
 	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" || s.Owner != Owner {
+			t.Errorf("the end of %s = %+v, want passed in its last phase", a.ID, s)
+		}
+	}
+	mu.Lock()
+	logged := strings.Join(said, "\n")
+	quota = 600 // the cap lowered: one step at 6 cores, followed at the next judgement
+	mu.Unlock()
+	if !strings.Contains(logged, "the delivery ask "+asks[0].ID+" on shanks: unit: tests of 3 packages") {
+		t.Errorf("no journal line names the ask's phase: %s", logged)
+	}
+	if c := p.CapacityDetail(); c.Effective != 1 {
+		t.Errorf("after the quota fell to 6 cores, capacity %+v, want 1", c)
+	}
 }
 
-// An ask that is not one, or not this seat's, is dropped and runs nowhere.
+// An ask that is not one, or not this seat's, is dropped and runs nowhere. And issue 890/AC1: a check ask needing
+// node-build-node is declined on a node that lacks it (its step refused as declined, naming what it lacks, the message
+// dropped for the asker to put again), and runs on a node that has it.
 func TestPullDropsWhatIsNoAsk(t *testing.T) {
 	src, st := NewFakeAsks(), newSteps()
 	src.Publish(delivery.AskDelivery, []byte(`{"v":1}`))
 	other := testAsk(delivery.AskDelivery)
 	other.Language = delivery.AskNode
 	_ = src.PublishAsk(other)
+	placed := testAsk(delivery.AskCheck)
+	placed.Needs = []string{delivery.NeedNodeBuildNode}
+	if err := src.PublishAsk(placed); err != nil {
+		t.Fatal(err)
+	}
 	ran := false
-	p := &Puller{Source: src, Language: delivery.AskGo, Node: "shanks", Put: st.put, Capacity: func() int { return 1 },
+	p := &Puller{Source: src, Language: delivery.AskGo, Node: "ace", Put: st.put, Capacity: func() int { return 1 },
 		PullWait: 10 * time.Millisecond, Run: func(ctx context.Context, a delivery.StepAsk) (any, error) { ran = true; return nil, nil }}
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	go p.Pull(ctx)
-	waitFor(t, "two termed", func() bool { _, tm, _ := src.Fates(); return len(tm) == 2 })
+	waitFor(t, "three termed", func() bool { _, tm, _ := src.Fates(); return len(tm) == 3 })
 	if ran {
-		t.Fatal("a wrong ask ran")
+		t.Fatal("a wrong or a declined ask ran")
 	}
+	key, _ := delivery.AskStepKey("ace", placed.ID)
+	s, _ := st.get(key)
+	if d, ok := delivery.DeclinedOf(s); !ok || len(d.Lacks) != 1 || d.Lacks[0] != delivery.NeedNodeBuildNode || !strings.Contains(s.Reason, "lacks node-build-node") {
+		t.Fatalf("the declined step = %+v", s)
+	}
+	has, hasSteps := NewFakeAsks(), newSteps()
+	_ = has.PublishAsk(placed)
+	q := &Puller{Source: has, Language: delivery.AskGo, Node: "g14", Put: hasSteps.put, Capacity: func() int { return 1 },
+		PullWait: 10 * time.Millisecond, Has: func(n string) bool { return n == delivery.NeedNodeBuildNode },
+		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) { return nil, nil }}
+	go q.Pull(ctx)
+	waitFor(t, "the placed ask acked where its need is met", func() bool { a, _, _ := has.Fates(); return len(a) == 1 })
 }
 
 // load reads the recorded steps state's raw values: the pause key is not a step, so it is kept apart.
@@ -208,7 +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,
@@ -224,7 +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/seat_tools.go

@@ -14,10 +14,13 @@ func SeatTools(seat, what string, p *Puller) []stdio.Tool {
 			Run:   func(map[string]any) (any, error) { return run() }}
 	}
 	current := func() (any, error) {
-		return map[string]any{"node": p.Node, "capacity": p.CapacityNow(), "running": p.Running(), "paused": p.Paused()}, nil
+		c := p.CapacityDetail()
+		return map[string]any{"node": p.Node, "capacity": c.Effective, "capacity_why": c.Why, "capacity_detail": c,
+			"running": p.Running(), "paused": p.Paused()}, nil
 	}
 	return []stdio.Tool{
-		verb("current", "The "+what+" asks this node runs now (each one's id, kind and when it started), its build capacity, "+
+		verb("current", "The "+what+" asks this node runs now (each one's id, kind and when it started), its build capacity (the configured one, "+
+			"bounded by the cores its node's build slice gives over the cores a step needs) and why, "+
 			"and whether it is paused.", current),
 		verb("pause", "Take no new "+what+" ask on this node until resumed; an ask running here ends in its place. Kept "+
 			"across a restart (the node's pause key).", func() (any, error) {

go/buildstep/stale.go

@@ -0,0 +1,365 @@
+package buildstep
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// **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 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 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), 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 {
+	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.
+// 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")
+}
+
+// AskWhat says what an ask is, in one line: its kind, and its repository, head and levels, or its module and
+// fingerprint.
+func AskWhat(a delivery.StepAsk) string {
+	short := func(s string) string {
+		if len(s) > 12 {
+			return s[:12]
+		}
+		return s
+	}
+	str := func(m map[string]any, k string) string { v, _ := m[k].(string); return v }
+	parts := []string{a.Kind + " ask"}
+	switch {
+	case a.Check != nil:
+		parts = append(parts, str(a.Check.Fetch, "repository")+"@"+short(str(a.Check.Fetch, "commit")), "levels "+strings.Join(a.Check.Levels, ","))
+		if a.Check.Run != "" {
+			parts = append(parts, "run "+a.Check.Run)
+		}
+	case a.Build != nil:
+		parts = append(parts, "module "+a.Build.Module)
+		if r := str(a.Build.Fetch, "repository"); r != "" {
+			parts = append(parts, r+"@"+short(str(a.Build.Fetch, "commit")))
+		}
+		if a.Build.FP != "" {
+			parts = append(parts, "fp "+short(a.Build.FP))
+		}
+	case a.Compose != nil:
+		parts = append(parts, "compose", str(a.Compose.Fetch, "repository")+"@"+short(str(a.Compose.Fetch, "commit")))
+	}
+	return strings.Join(parts, ", ")
+}
+
+// endRunning writes step ended failed with why, only while its key is still at revision.
+func endRunning(scan Scan, key string, step delivery.Step, revision uint64, why string) error {
+	step.State, step.Reason, step.Ended, step.Result = delivery.StepFailed, why, now().UTC(), nil
+	raw, err := delivery.EncodeStep(step)
+	if err != nil {
+		return err
+	}
+	_, err = scan.Update(key, json.RawMessage(raw), revision)
+	return err
+}
+
+// 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()
+	if err != nil {
+		return nil, fmt.Errorf("buildstep: listing the steps of %s: %w", node, err)
+	}
+	var ended []string
+	for _, k := range keys {
+		n, _, perr := delivery.ParseStepKey(k)
+		if perr != nil || n != node {
+			continue
+		}
+		raw, rev, err := scan.Get(k)
+		if err != nil {
+			return ended, fmt.Errorf("buildstep: reading the step %s: %w", k, err)
+		}
+		if len(raw) == 0 {
+			continue
+		}
+		step, err := delivery.DecodeStep(raw)
+		if err != nil || step.State != delivery.StepRunning {
+			continue
+		}
+		why, said := staleWhy(k, step, before)
+		if why == "" {
+			continue
+		}
+		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, 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 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 {
+		if n != node {
+			return delivery.Step{}, fmt.Errorf("the step %q is of node %q, this module runs on %q", id, n, node)
+		}
+		id = rest
+	}
+	if strings.TrimSpace(why) == "" {
+		return delivery.Step{}, fmt.Errorf("say why the step is ended (why)")
+	}
+	key, err := delivery.StepKey(node, id)
+	if err != nil {
+		return delivery.Step{}, err
+	}
+	raw, rev, err := scan.Get(key)
+	if err != nil {
+		return delivery.Step{}, err
+	}
+	if len(raw) == 0 {
+		return delivery.Step{}, fmt.Errorf("no step %s in the steps state", key)
+	}
+	step, err := delivery.DecodeStep(raw)
+	if err != nil {
+		return delivery.Step{}, err
+	}
+	if step.State != delivery.StepRunning {
+		return delivery.Step{}, fmt.Errorf("the step %s is %s, not running", key, step.State)
+	}
+	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 {
+		if errors.Is(err, stdio.ErrChanged) {
+			return delivery.Step{}, fmt.Errorf("the step %s changed while it was being ended; read it again", key)
+		}
+		return delivery.Step{}, err
+	}
+	step.State, step.Reason = delivery.StepFailed, why
+	return step, nil
+}
+
+// StepEndTool is the module's step-end tool, named name (build_go_step_end): it ends one step left running, with a
+// reason, refusing one this process started. p may be nil.
+func StepEndTool(name string, node string, scan Scan, p *Puller) stdio.Tool {
+	return stdio.Tool{Name: name,
+		Description: "End one step of this machine that is stuck in state running (for instance left by a restart of the module) " +
+			"as failed, with the reason given; its asker then sees it over, so ending an ask still in its stream fails its asker. " +
+			"A step not running, or one this process started, is refused. " +
+			"id is the step id or the key <node>.<id>.",
+		Input: map[string]any{"type": "object", "required": []string{"id", "why"}, "properties": map[string]any{
+			"id":  map[string]any{"type": "string", "description": "the step id, or the key <node>.<id>"},
+			"why": map[string]any{"type": "string", "description": "why it is ended; it becomes the step's reason"}}},
+		Run: func(args map[string]any) (any, error) {
+			id, _ := args["id"].(string)
+			why, _ := args["why"].(string)
+			var live func(string) bool
+			if p != nil {
+				live = func(id string) bool {
+					for _, r := range p.Running() {
+						if r.ID == id {
+							return true
+						}
+					}
+					return false
+				}
+			}
+			return EndOne(scan, node, id, why, live)
+		}}
+}
+
+// StaleAttempts and StaleRetry bound EndStaleAtStart's tries: the steps state is readable once the runtime serves.
+var (
+	StaleAttempts = 6
+	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 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 <-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)
+		if err == nil {
+			if logf != nil {
+				logf("%d steps of %s left running by a previous process ended", len(ended), node)
+			}
+			return
+		}
+		if logf != nil {
+			logf("ending the steps left running (try %d of %d): %v", attempt, StaleAttempts, err)
+		}
+		if attempt >= StaleAttempts {
+			return
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(StaleRetry):
+		}
+	}
+}
+
+// EndStaleRound is EndStale as the module's periodic round runs it: at once, and only when the runtime serves (a round
+// before that is skipped, the start's EndStaleAtStart and the next round cover it). It ends the steps a previous
+// process left and the asks past delivery.StepBound.
+func EndStaleRound(scan Scan, node string, logf func(string, ...any)) {
+	select {
+	case <-stdio.Served():
+	default:
+		return
+	}
+	if _, err := EndStale(scan, node, Boot, logf); err != nil && logf != nil {
+		logf("ending the steps left running: %v", err)
+	}
+}

go/buildstep/stale_test.go

@@ -0,0 +1,161 @@
+package buildstep
+
+import (
+	"encoding/json"
+	"fmt"
+	stdio "git.novox.be/novox/mesh-sdk/go"
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// scanOf is the steps a keys double holds, last value per key, its revision the count of its puts; a write through
+// Update lands only at the revision read, as the state's does. race, when set, runs once before the next Update's check.
+func scanOf(k *keys, race func(key string)) Scan {
+	return Scan{
+		Keys: func() ([]string, error) {
+			k.mu.Lock()
+			defer k.mu.Unlock()
+			var out []string
+			for key := range k.puts {
+				out = append(out, key)
+			}
+			return out, nil
+		},
+		Get: func(key string) (json.RawMessage, uint64, error) {
+			k.mu.Lock()
+			defer k.mu.Unlock()
+			s, ok := k.puts[key]
+			if !ok {
+				return nil, 0, nil
+			}
+			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)
+			}
+			k.mu.Lock()
+			n := uint64(len(k.puts[key]))
+			k.mu.Unlock()
+			if n != revision {
+				return 0, stdio.ErrChanged
+			}
+			return k.put(key, value)
+		},
+	}
+}
+
+// 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 }()
+	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, 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", "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), "")
+		}
+	})
+	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 _, 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)
+	}
+	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 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.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" || 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 {
+	t.Helper()
+	raw, err := delivery.EncodeStep(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return raw
+}
+
+// 1890: AskWhat names the repository, head and levels of a check ask and the module of a build ask.
+func TestAskWhat(t *testing.T) {
+	check := delivery.StepAsk{Kind: "check", Check: &delivery.CheckJob{Fetch: map[string]any{"repository": "novox/mesh-sdk", "commit": "0123456789abcdef0123"}, Levels: []string{"unit", "integration"}}}
+	if got, want := AskWhat(check), "check ask, novox/mesh-sdk@0123456789ab, levels unit,integration"; got != want {
+		t.Errorf("check = %q", got)
+	}
+	build := delivery.StepAsk{Kind: "delivery", Build: &delivery.BuildJob{Module: "mesh-x", FP: "abcdef0123456789"}}
+	if got, want := AskWhat(build), "delivery ask, module mesh-x, fp abcdef012345"; got != want {
+		t.Errorf("build = %q", got)
+	}
+}

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 (
@@ -43,7 +44,7 @@ func NewID() string {
 // the error's text, or refused when the error is a *Refusal; a panic in run ends the step failed, naming it, and
 // the process goes on. If the running write fails, nothing was started and Start answers the error.
 func Start(ctx context.Context, put Put, node, tool string, run func(ctx context.Context) (result any, err error)) (string, error) {
-	step, key, err := begin(put, node, tool, NewID())
+	step, key, err := begin(put, node, tool, NewID(), "")
 	if err != nil {
 		return "", err
 	}
@@ -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.
-func begin(put Put, node, tool, id string) (delivery.Step, string, error) {
-	step := delivery.Step{ID: id, Tool: tool, Node: node, State: delivery.StepRunning, Started: now().UTC()}
+// 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, 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/buildstep/trees.go

@@ -36,7 +36,7 @@ var lockFiles = []string{"go.sum", "package-lock.json"}
 func ModuleTrees(ctx context.Context, run forgekey.Runner, env []string, dir, commit string) (map[string]ModuleTree, error) {
 	r := run(ctx, env, "git", "-C", dir, "ls-files", "--", "module.json", "*/module.json")
 	if r.Status != 0 || r.Err != "" {
-		return nil, fmt.Errorf("git ls-files: %s", firstLine(r.Err+" "+r.Stderr))
+		return nil, fmt.Errorf("git ls-files: %s", forgekey.Said(r.Err+"\n"+r.Stderr))
 	}
 	trees := map[string]ModuleTree{}
 	for _, l := range strings.Split(r.Stdout, "\n") {
@@ -50,7 +50,7 @@ func ModuleTrees(ctx context.Context, run forgekey.Runner, env []string, dir, co
 		}
 		t := run(ctx, env, "git", "-C", dir, "rev-parse", spec)
 		if t.Status != 0 || t.Err != "" {
-			return nil, fmt.Errorf("git rev-parse %s: %s", spec, firstLine(t.Err+" "+t.Stderr))
+			return nil, fmt.Errorf("git rev-parse %s: %s", spec, forgekey.Said(t.Err+"\n"+t.Stderr))
 		}
 		mt := ModuleTree{Tree: strings.TrimSpace(t.Stdout)}
 		raw, err := os.ReadFile(filepath.Join(dir, filepath.FromSlash(l)))
@@ -93,7 +93,7 @@ func narrow(ctx context.Context, run forgekey.Runner, env []string, dir, commit,
 	}
 	r := run(ctx, env, "git", append([]string{"-C", dir, "ls-tree", "-z", commit, "--"}, full...)...)
 	if r.Status != 0 || r.Err != "" {
-		return fmt.Errorf("git ls-tree %s of the module %s: %s", commit, mdir, firstLine(r.Err+" "+r.Stderr))
+		return fmt.Errorf("git ls-tree %s of the module %s: %s", commit, mdir, forgekey.Said(r.Err+"\n"+r.Stderr))
 	}
 	objects := map[string]string{}
 	for _, l := range strings.Split(r.Stdout, "\x00") {

go/buscompose/announced.go

@@ -45,10 +45,25 @@ func ControllerAnnouncement(node string) announce.States {
 // announced the state readable, or announced nothing yet (the transition); refused when the owner announced and did
 // not announce that state readable.
 func ReadsAnnounced(reads []string, announced map[string]announce.States) (granted, refused []string) {
+	return ReadsAnnouncedBy("", reads, announced)
+}
+
+// ReadsAnnouncedBy is ReadsAnnounced for one reader module, which also honours the readers an owner named for a state
+// (announce.State.Readers) and the composer's named readers (NamedReaders, ADR 0547 clause 9): a read named for other
+// modules is refused. An empty reader is judged by the readable mark alone.
+func ReadsAnnouncedBy(reader string, reads []string, announced map[string]announce.States) (granted, refused []string) {
 	for _, r := range reads {
 		owner, name, ok := strings.Cut(r, ".")
 		s, said := announced[owner]
 		switch {
+		case reader != "" && !ReaderMay(reader, r):
+			refused = append(refused, r)
+		case reader != "" && ok && said && s.Keeps(name):
+			if s.ReadableBy(name, reader) {
+				granted = append(granted, r)
+			} else {
+				refused = append(refused, r)
+			}
 		case !ok || !said || s.Readable(name):
 			granted = append(granted, r)
 		default:

go/buscompose/buscompose_test.go

@@ -5,16 +5,135 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"regexp"
+	"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
 // byte what the controller's composes. testdata/controller-user-lists.json was written by the controller's own
 // internal/broker (mesh-controller branch fix/1945-mesh-grants-publishes-memberships, and fix/1790-grants-create-buckets for the grants part creating declared streams), lists and memberships, from fixtures_test.go compiled there unchanged; composed.conf is the
 // controller's golden of the whole server configuration. A row that differs is the copy drifting from the controller,
-// which is a fault while both compose (until the controller loses its lease, ADR 0547 §13).
+// which is a fault while both compose (until the controller loses its lease, ADR 0547 §13), but for the grants the copy
+// gives beyond it on purpose (beyondTheControllers): the copy grants every user everything the controller's grants, and
+// only those more.
+// createdAdvisory is one subscription to a bucket's creation in a composed list, as stateCreatedHeard composes it.
+var createdAdvisory = regexp.MustCompile(`"\$JS\.EVENT\.ADVISORY\.STREAM\.CREATED\.KV_[^"]*", `)
+
+// beyondTheControllers is what the copy grants beyond the controller's on purpose (novox/hq ADR 0547 §2, ADR 0555 §3,
+// issue 1126), by user: a node's account reads every node's own facts, `<node>.node` of the have bucket where the node's
+// record rides, and what it composes its own modules from (NodeComposeReads). After the take-over (ADR 0547 §8) the
+// grants part's list is the one the bus loads; a hand-back loads the controller's, which lacks these reads, and the nodes
+// keep applying without composing their own until the next take-over. Each principal's hearing of its buckets' creation
+// (issue 1790) is the other row beyond, matched by createdAdvisory.
+func beyondTheControllers(user string) map[string]bool {
+	out := map[string]bool{}
+	node, ok := strings.CutPrefix(user, "node.")
+	if !ok {
+		return out
+	}
+	for _, s := range append(append(readGrants("node-engine_have", "*.node"), NodeComposeReads(node)...), NodeComposeAdvisories()...) {
+		out[s] = true
+	}
+	return out
+}
+
+// mayBeyondTheControllers is what the copy may grant beyond the controller's where the records allow it, and need not
+// where they do not: a node's ask of the vault's `own` while the vault serves it (issue 1126, ADR 0550 §5).
+func mayBeyondTheControllers(user string) map[string]bool {
+	if _, ok := strings.CutPrefix(user, "node."); !ok {
+		return nil
+	}
+	return map[string]bool{VaultOwnCall(Principal{Kind: KindNode, Node: strings.TrimPrefix(user, "node.")}): true,
+		VaultSecretChanged: true}
+}
+
+// quotedToken is a quoted token of a composed list.
+var quotedToken = regexp.MustCompile(`"[^"]*"`)
+
+// grantsByUser splits a composed list into the text outside its users and each user's quoted tokens (its name, its
+// password's hash, every subject it may publish or subscribe to), by user.
+func grantsByUser(list string) (string, map[string]map[string]bool) {
+	var outside strings.Builder
+	users := map[string]map[string]bool{}
+	user := ""
+	for _, line := range strings.SplitAfter(list, "\n") {
+		trimmed := strings.TrimSpace(line)
+		if name, ok := strings.CutPrefix(trimmed, `{ user: "`); ok {
+			user, _, _ = strings.Cut(name, `"`)
+			users[user] = map[string]bool{}
+		} else if user != "" && trimmed == "]" {
+			user = ""
+		}
+		if user == "" {
+			outside.WriteString(line)
+			continue
+		}
+		for _, q := range quotedToken.FindAllString(line, -1) {
+			users[user][strings.Trim(q, `"`)] = true
+		}
+	}
+	return outside.String(), users
+}
+
+// grantsAsTheControllers fails t unless the copy's list is the controller's, user for user, but for the grants it
+// names on purpose (beyondTheControllers, the creation advisories): every grant of the controller's is the copy's, and
+// the copy's beyond them are exactly those, every one of them there.
+func grantsAsTheControllers(t *testing.T, got, want string) {
+	t.Helper()
+	gotOutside, gotUsers := grantsByUser(got)
+	wantOutside, wantUsers := grantsByUser(want)
+	if gotOutside != wantOutside {
+		t.Errorf("the list differs from the controller's outside its users:\n%s", gotOutside)
+	}
+	for user, was := range wantUsers {
+		now, ok := gotUsers[user]
+		if !ok {
+			t.Errorf("the copy has no user %s", user)
+			continue
+		}
+		intended := beyondTheControllers(user)
+		for g := range was {
+			if !now[g] {
+				t.Errorf("%s: the copy does not grant %s, which the controller's does", user, g)
+			}
+		}
+		for g := range now {
+			if !was[g] && !intended[g] && !mayBeyondTheControllers(user)[g] && !createdAdvisory.MatchString(`"`+g+`", `) {
+				t.Errorf("%s: the copy grants %s beyond the controller's, and no decision names it", user, g)
+			}
+		}
+		for g := range intended {
+			if !now[g] {
+				t.Errorf("%s: the copy does not grant %s, which a node composing its own modules reads", user, g)
+			}
+		}
+	}
+	for user := range gotUsers {
+		if _, ok := wantUsers[user]; !ok {
+			t.Errorf("the copy has a user %s the controller's has not", user)
+		}
+	}
+}
+
 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)
@@ -48,9 +167,11 @@ func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
 			if strings.Join(missing, ",") != strings.Join(want[i].Missing, ",") {
 				t.Errorf("left out %v, the controller %v", missing, want[i].Missing)
 			}
-			if list != want[i].List {
-				t.Errorf("the list differs from the controller's:\n%s", list)
-			}
+			// The one row the copy composes beyond the controller's, on purpose (novox/hq issue 1790, 2026-10-26, after
+			// the take-over of ADR 0547 milestone 2): each principal hears its own and read buckets created, so a state
+			// missing at its start is bound when it appears. The controller's composer is frozen and its list no longer
+			// loaded; while it is not, this row is left out of the comparison and nothing else.
+			grantsAsTheControllers(t, list, want[i].List)
 			// And every membership the records issue, as the controller's MembershipFor makes it (ADR 0547 §5): the
 			// grants part publishes them.
 			raw, err := json.Marshal(MembershipsFor(f))
@@ -69,6 +190,81 @@ func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
 			}
 		})
 	}
+	// An asker on a seat pulled by kind hears what that seat's workers gave up on, and no other stream's dead letters
+	// (novox/hq issue 734: a check ask given up during a bus reload left its try running for ever).
+	t.Run("an asker reads its seat's dead letters", func(t *testing.T) {
+		build := Seat{Name: "node-build-go", Scope: "node", Accepts: []string{"delivery", "check", "recheck"}, PulledByKind: true}
+		perms, err := PermissionsFor(Principal{Kind: KindModule, Node: "one", Module: "mesh-delivery-checker", Uses: []Seat{build}})
+		if err != nil {
+			t.Fatal(err)
+		}
+		for subject, want := range map[string]bool{
+			"$JS.API.CONSUMER.CREATE.DEAD_LETTERS.x1.mesh.events.dead.SEAT_NODE_BUILD_GO.>":      true,
+			"$JS.API.CONSUMER.CREATE.DEAD_LETTERS.x1.mesh.events.dead.SEAT_NODE_BUILD_GO.w.next": true,
+			"$JS.API.CONSUMER.DELETE.DEAD_LETTERS.x1":                                            true,
+			"$JS.API.CONSUMER.MSG.NEXT.DEAD_LETTERS.x1":                                          true,
+			"$JS.API.CONSUMER.CREATE.DEAD_LETTERS.x1.mesh.events.dead.EVENTS.>":                  false,
+			"$JS.API.CONSUMER.CREATE.DEAD_LETTERS.x1":                                            false,
+			"$JS.API.STREAM.PURGE.DEAD_LETTERS":                                                  false,
+			"$JS.FC.DEAD_LETTERS.x1":                                                             false,
+		} {
+			if got := MayPublish(perms, subject); got != want {
+				t.Errorf("may publish %s: %v, want %v", subject, got, want)
+			}
+		}
+		plain, err := PermissionsFor(Principal{Kind: KindModule, Node: "one", Module: "shop",
+			Uses: []Seat{{Name: "telegram-sender", Accepts: []string{"send"}}}})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if MayPublish(plain, "$JS.API.CONSUMER.DELETE.DEAD_LETTERS.x1") {
+			t.Error("a user of a seat not pulled by kind reads DEAD_LETTERS")
+		}
+	})
+	// Issue 1126 (ADR 0550 §5): a node's engine asks the vault's `own` in its own name while the vault serves it, and no
+	// other node's.
+	t.Run("a node asks the vault its own secrets", func(t *testing.T) {
+		one := Principal{Kind: KindNode, Node: "one", AsksItsOwnSecrets: true}
+		perms, err := PermissionsFor(one)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !MayPublish(perms, VaultOwnCall(one)) || MayPublish(perms, VaultOwnCall(Principal{Kind: KindNode, Node: "two"})) {
+			t.Errorf("node one asks own as %v, and as two %v", MayPublish(perms, VaultOwnCall(one)),
+				MayPublish(perms, VaultOwnCall(Principal{Kind: KindNode, Node: "two"})))
+		}
+		if plain, _ := PermissionsFor(Principal{Kind: KindNode, Node: "one"}); MayPublish(plain, VaultOwnCall(one)) {
+			t.Error("a node asks own while the vault does not serve it")
+		}
+		if !slices.Contains(perms.Subscribe, VaultSecretChanged) {
+			t.Errorf("node one does not hear the vault's secret-changed: %v", perms.Subscribe)
+		}
+		// And what a module on another node serves from its settings, that key alone (mailu's smtp domain, issue 1126).
+		users, err := Users(Records{Nodes: []string{"one", "two"}, Assigned: map[string][]Declared{
+			"two": {{Module: "mailer", Served: []string{"domain", "not.a.token"}}}}})
+		if err != nil {
+			t.Fatal(err)
+		}
+		get := func(key string) string {
+			return "$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"}}
 		got, err := Compose(
@@ -95,8 +291,6 @@ func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if got != string(want) {
-			t.Errorf("the configuration differs from the controller's golden:\n%s", got)
-		}
+		grantsAsTheControllers(t, got, string(want))
 	})
 }

go/buscompose/creates_streams_test.go

@@ -4,16 +4,24 @@ import "testing"
 
 // Defends issue 1790 and novox/hq ADR 0547 §5 (the operator, 2026-10-26 08:54): the grants part may create the stream
 // of each bucket, log and stream a placed module's manifest declares, by its own name, and read it back; nothing
-// wider, nothing updated or deleted, and no other principal so. Held byte-equal in the controller's copy.
+// wider, nothing updated or deleted, and no other principal so. Held byte-equal in the controller's copy. And ADR 0547
+// clause 7 (issue 1945, the operator's second exception): the grants part writes its own object bucket of sealed user
+// lists, and the node-engine of the node holding mesh-broker alone reads its one key and an object of it by name.
 func TestTheGrantsPartCreatesOnlyDeclaredStreams(t *testing.T) {
 	records := Records{
-		Nodes: []string{"novox"},
-		Assigned: map[string][]Declared{"novox": {
+		Nodes: []string{"novox", "ace"},
+		Assigned: map[string][]Declared{"ace": {{Module: "plex"}}, "novox": {
+			{Module: "nats", SnapshotsTheBus: true},
+			// mesh-sdk's copy alone (ADR 0547 clause 9, named readers): the vault's hashes are read by the grants part
+			// alone, whatever another module's reads say; the controller's copy grants any module that declares it.
+			{Module: "mesh-vault", State: []Bucket{{Module: "mesh-vault", Name: "bus-accounts"}}},
+			{Module: "spy", Serves: []string{"spy_x"}, Reads: []string{VaultBusAccounts}},
 			{Module: "mesh-delivery-builder",
 				State:   []Bucket{{Module: "mesh-delivery-builder", Name: "steps", History: 5}},
 				Logs:    []Log{{Module: "mesh-delivery-builder", Name: "builds"}},
 				Streams: []ModuleStream{{Module: "mesh-delivery-builder", Name: "BUILDASKS", Events: []string{"ask"}}}},
-			{Module: GrantsModule, State: []Bucket{{Module: GrantsModule, Name: "assertions"}}},
+			{Module: GrantsModule, State: []Bucket{{Module: GrantsModule, Name: "assertions"}}, Reads: []string{VaultBusAccounts}},
+			{Module: RuntimeModule},
 		}},
 	}
 	users, err := Users(records)
@@ -22,6 +30,14 @@ func TestTheGrantsPartCreatesOnlyDeclaredStreams(t *testing.T) {
 	}
 	perms := map[string]Permissions{}
 	for _, u := range users {
+		if u.Kind == KindNode || u.Kind == KindNodeTools {
+			p, err := PermissionsFor(u)
+			if err != nil {
+				t.Fatalf("%s: %v", u.Username(), err)
+			}
+			perms[u.Username()] = p
+			continue
+		}
 		if u.Kind != KindModule {
 			continue
 		}
@@ -48,11 +64,48 @@ func TestTheGrantsPartCreatesOnlyDeclaredStreams(t *testing.T) {
 		{GrantsModule, "$JS.API.STREAM.CREATE.ASSIGNMENTS", false},
 		{GrantsModule, "$JS.API.STREAM.INFO.EVENTS", false},
 		{"mesh-delivery-builder", "$JS.API.STREAM.CREATE.KV_mesh-delivery-builder_steps", false},
+		// The sealed user list (ADR 0547 clause 7): the grants part writes its own bucket and no other.
+		{GrantsModule, "$JS.API.STREAM.CREATE.OBJ_mesh-grants-user-list", true},
+		{GrantsModule, "$O.mesh-grants-user-list.C.abc", true},
+		{GrantsModule, "$JS.API.STREAM.PURGE.OBJ_mesh-grants-user-list", true},
+		{GrantsModule, "$O.declaration-files-novox.C.abc", false},
+		{GrantsModule, "$JS.API.STREAM.DELETE.OBJ_mesh-grants-user-list", false},
+		{"mesh-delivery-builder", "$O.mesh-grants-user-list.C.abc", false},
+		// The bus node's engine reads the one key and an object by name; nothing of the bucket's list, no write.
+		{"node.novox", "$JS.API.DIRECT.GET.KV_mesh-grants_user-list.$KV.mesh-grants_user-list.sealed", true},
+		{"node.novox", "$JS.API.CONSUMER.CREATE.KV_mesh-grants_user-list.abc.$KV.mesh-grants_user-list.sealed", true},
+		{"node.novox", "$JS.API.DIRECT.GET.OBJ_mesh-grants-user-list.$O.mesh-grants-user-list.M.abc", true},
+		{"node.novox", "$JS.API.CONSUMER.CREATE.OBJ_mesh-grants-user-list.abc.$O.mesh-grants-user-list.C.abc", true},
+		{"node.novox", "$JS.API.DIRECT.GET.KV_mesh-grants_user-list.$KV.mesh-grants_user-list.list", false},
+		{"node.novox", "$JS.API.STREAM.INFO.OBJ_mesh-grants-user-list", false},
+		{"node.novox", "$JS.API.STREAM.MSG.GET.OBJ_mesh-grants-user-list", false},
+		{"node.novox", "$O.mesh-grants-user-list.C.abc", false},
+		{"node.ace", "$JS.API.DIRECT.GET.KV_mesh-grants_user-list.$KV.mesh-grants_user-list.sealed", false},
+		{"node.ace", "$JS.API.DIRECT.GET.OBJ_mesh-grants-user-list.$O.mesh-grants-user-list.M.abc", false},
+		{GrantsModule, "$JS.API.DIRECT.GET.KV_mesh-vault_bus-accounts.$KV.mesh-vault_bus-accounts.x", true},
+		{"spy", "$JS.API.DIRECT.GET.KV_mesh-vault_bus-accounts.$KV.mesh-vault_bus-accounts.x", false},
+		{"novox.node-tools", "$JS.API.DIRECT.GET.KV_mesh-vault_bus-accounts.$KV.mesh-vault_bus-accounts.x", false},
 	} {
 		if got := MayPublish(perms[row.who], row.subject); got != row.may {
 			t.Errorf("%s may publish %s: %v, want %v", row.who, row.subject, got, row.may)
 		}
 	}
+	// Issue 1790 (2026-10-26): a module hears the bus create each bucket it may bind, its own and those it reads, so a
+	// state missing at its start is bound when it appears; no other bucket's, and no other advisory.
+	for _, row := range []struct {
+		who, subject string
+		may          bool
+	}{
+		{"mesh-delivery-builder", "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_mesh-delivery-builder_steps", true},
+		{GrantsModule, "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_mesh-vault_bus-accounts", true},
+		{"mesh-delivery-builder", "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_mesh-grants_assertions", false},
+		{"mesh-delivery-builder", "$JS.EVENT.ADVISORY.STREAM.CREATED.LOG_mesh-delivery-builder_builds", false},
+		{"mesh-delivery-builder", "$JS.EVENT.ADVISORY.STREAM.DELETED.KV_mesh-delivery-builder_steps", false},
+	} {
+		if got := MaySubscribe(perms[row.who], row.subject); got != row.may {
+			t.Errorf("%s may hear %s: %v, want %v", row.who, row.subject, got, row.may)
+		}
+	}
 	// A name that is no plain token is never granted, and a module other than the grants part is never granted one.
 	if got := CreateStreamGrants([]string{"*", ">", "KV_a.b", "KV_a_b"}); len(got) != 2 {
 		t.Errorf("grants for wildcard names: %v", got)

go/buscompose/nats.go

@@ -213,6 +213,17 @@ type Principal struct {
 	// StatesItsKeyToTheVault is a machine principal whose node-engine may ask the vault's `node-key` in its own name
 	// (issue 786, novox/hq ADR 0372): set while the vault's holder serves it. That one verb, and nothing else new.
 	StatesItsKeyToTheVault bool
+	// AsksItsOwnSecrets is a machine principal whose node-engine may ask the vault's `own` in its own name (novox/hq
+	// 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
 	// BoundBuckets are the providers' buckets of entries, `<module>_bound`, a provisioner client reads its own
 	// machine's keys of (mesh-sdk go/provider, issue 679): every bucket named bound of a module the mesh places.
 	BoundBuckets []string
@@ -341,6 +352,10 @@ var VaultMoveIn = SeatVerb{Seat: "mesh-vault", Verb: "move-in"}
 // novox/hq ADR 0372); granted as Principal.StatesItsKeyToTheVault says.
 var VaultNodeKey = SeatVerb{Seat: "mesh-vault", Verb: "node-key"}
 
+// VaultOwn is the vault's verb a machine's node-engine asks in its own name for its modules' own secrets sealed to its
+// key (issue 1126, ADR 0550 §5); granted as Principal.AsksItsOwnSecrets says.
+var VaultOwn = SeatVerb{Seat: "mesh-vault", Verb: "own"}
+
 // VerbsTheControllerActsOnAWarrant are the other seat verbs the controller calls when the operator's warrant
 // chooses them (novox/hq ADR 0259): a machine's service restarted, and a walk started or stopped through the
 // controller's own `plans`, a machine's held builds sent by its own `push` and the builds held after a failed release
@@ -879,6 +894,20 @@ func PermissionsFor(p Principal) (Permissions, error) {
 			return Permissions{}, err
 		}
 		pub = append(pub, haveKeys...)
+		// And every node's own facts, `<node>.node`, its record among them (issue 1126, ADR 0555 §3): a node agent composing
+		// 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 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)
@@ -902,6 +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 {
@@ -912,6 +944,19 @@ func PermissionsFor(p Principal) (Permissions, error) {
 		if p.StatesItsKeyToTheVault {
 			pub = append(pub, "mesh.seat."+VaultNodeKey.Seat+"."+CallKind+"."+VaultNodeKey.Verb+"."+CallerToken(p.Username()))
 		}
+		// And, while the vault serves it, its modules' own secrets in its own name (issue 1126): sealed to its key, for the
+		// compositions it makes itself.
+		if p.AsksItsOwnSecrets {
+			pub = append(pub, VaultOwnCall(p))
+			// And the vault's word that a secret changed (names and generations, never a value), so the node composes again
+			// on it rather than at the next unrelated change (ADR 0547 §2).
+			sub = append(sub, VaultSecretChanged)
+		}
+		// And, on the node holding mesh-broker, the grants part's sealed user list it follows from take-over (novox/hq ADR
+		// 0547 clause 7): one key, and an object by its name.
+		if p.FollowsGrantsUserList {
+			pub = append(pub, GrantsUserListFollows()...)
+		}
 
 	case KindModule:
 		// 0. The watchman alone hears who connects and disconnects, and asks who is connected (ADR 0431 §2).
@@ -927,6 +972,8 @@ func PermissionsFor(p Principal) (Permissions, error) {
 			// And creating each stream a manifest declares, by its own name (the operator, 2026-10-26 08:54; issue
 			// 1790): the create and the read of that one stream, never an update, a delete or a stream not declared.
 			pub = append(pub, CreateStreamGrants(p.CreatesStreams)...)
+			// And its own object bucket, where it writes the user list sealed to the bus node (ADR 0547 clause 7).
+			pub = append(pub, GrantsUserListWrites()...)
 		}
 		// The view alone reads the build seats' workers for the backlog of asks (issue 1887 A8a).
 		if p.Module == ViewModule {
@@ -1075,8 +1122,12 @@ func PermissionsFor(p Principal) (Permissions, error) {
 
 		// 5. Its state, and the state of others it reads (novox/hq ADR 0201): every one read and
 		//    watched, its own written too.
-		pub = append(pub, stateGrants(stateAccess{Module: p.Module, Node: p.Node, Keeps: p.State,
-			PerMachine: p.PerMachine, Reads: p.Reads, KeyedReads: p.KeyedReads})...)
+		kept := stateAccess{Module: p.Module, Node: p.Node, Keeps: p.State, PerMachine: p.PerMachine, Reads: p.Reads,
+			KeyedReads: p.KeyedReads}
+		pub = append(pub, stateGrants(kept)...)
+		// And it hears each of those buckets created, so one not on the bus at its start is bound when it appears
+		// (novox/hq issue 1790; mesh-sdk process.AwaitBucket).
+		sub = append(sub, stateCreatedHeard(kept)...)
 		// And its logs (novox/hq ADR 0297): appended to and read directly, its own alone.
 		pub = append(pub, logGrants(p.Module, p.Logs)...)
 
@@ -1770,3 +1821,12 @@ const (
 	nodeToolsService = "node-tools"
 	leaseKey         = "holder"
 )
+
+// VaultOwnCall is the subject a machine principal's node-engine asks the vault's `own` on, in its own name.
+func VaultOwnCall(p Principal) string {
+	return "mesh.seat." + VaultOwn.Seat + "." + CallKind + "." + VaultOwn.Verb + "." + CallerToken(p.Username())
+}
+
+// VaultSecretChanged is the vault's event that a secret changed (a name and its generation, never a value), which a
+// node composing its own hears to compose again (issue 1126, ADR 0547 §2).
+var VaultSecretChanged = "mesh.mod." + VaultOwn.Seat + ".event.secret-changed"

go/buscompose/process_grants.go

@@ -30,7 +30,11 @@ func processGrants(p Principal) (pub, sub []string, err error) {
 
 	// 3. Its module's own state, by the local names its bus names alone — never the whole of what the
 	// module keeps (novox/hq ADR 0436 §1), read and written as stateGrants gives any module's own bucket.
-	pub = append(pub, stateGrants(stateAccess{Module: p.Module, Node: p.Node, Keeps: p.State})...)
+	kept := stateAccess{Module: p.Module, Node: p.Node, Keeps: p.State}
+	pub = append(pub, stateGrants(kept)...)
+	// And it hears each of them created, so one not on the bus at its start is bound when it appears (novox/hq issue
+	// 1790; process.AwaitBucket).
+	sub = append(sub, stateCreatedHeard(kept)...)
 
 	// 4. The router's records of its module's own asks (novox/hq ADR 0436 §1, ADR 0259 §3): the same
 	// direct-get subjects a module's own principal reads for the seats its Uses names that keep them —

go/buscompose/seattraffic.go

@@ -24,8 +24,9 @@ import (
 //     subjects cover it, so what travels there — a code typed by the operator — is never persisted. A kinded
 //     holder asks with its own kind; the modules that watch the seat answer.
 //
-// And one read: **a holder's records**, a bucket the seat names, read by each user under its own name only
-// (`$KV.<bucket>.<module>.>`), so an asker reads the state of its own asks and no other asker's.
+// And two reads: **a holder's records**, a bucket the seat names, read by each user under its own name only
+// (`$KV.<bucket>.<module>.>`), so an asker reads the state of its own asks and no other asker's; and on a seat pulled by
+// kind, **what its workers gave up on**, the copies DEAD_LETTERS keeps of the seat's stream (DeadLetterReads, issue 734).
 
 // BuildAskMaxDeliver bounds the deliveries of a build seat's ask (issue 1907): mesh-sdk delivery.AskMaxDeliver, written
 // here as the broker mirrors the catalogue rather than importing it.
@@ -129,6 +130,9 @@ func SeatTrafficOf(module string, holds, uses, watches []Seat) SeatTraffic {
 			}
 			t.Records = append(t.Records, "$JS.API.DIRECT.GET.KV_"+b+".$KV."+b+"."+module+".>")
 		}
+		if s.PulledByKind && len(s.Accepts) > 0 && safeSubject.MatchString(s.Name) {
+			t.Records = append(t.Records, DeadLetterReads(seatStreamName(s.Name))...)
+		}
 	}
 	for _, w := range watches {
 		if w.Kinded {
@@ -151,6 +155,20 @@ func SeatTrafficOf(module string, holds, uses, watches []Seat) SeatTraffic {
 	return t
 }
 
+// DeadLetterReads is what a user of a seat pulled by kind is granted to hear which of the asks it put the seat's workers
+// gave up on (novox/hq issue 734): an ordered consumer on DEAD_LETTERS filtered to the copies the controller keeps of that
+// seat's stream (DeadLetterSubject(stream, *)), pulled, and its deletion. A copy carries the ask's own message id
+// (Mesh-Dead-Msg-Id), so the asker ends the step it waits for instead of waiting for ever; it reads the seat's dead
+// letters and no other stream's, and changes none.
+func DeadLetterReads(stream string) []string {
+	return []string{
+		"$JS.API.STREAM.INFO." + DeadLettersStream,
+		"$JS.API.CONSUMER.CREATE." + DeadLettersStream + ".*." + DeadLetterSubject(stream, ">"),
+		"$JS.API.CONSUMER.MSG.NEXT." + DeadLettersStream + ".*",
+		"$JS.API.CONSUMER.DELETE." + DeadLettersStream + ".*",
+	}
+}
+
 // seatTrafficGrants is the bus permissions seat traffic needs: the subjects themselves, and the JetStream API a
 // worker is pulled and acknowledged through and a record is read through.
 func seatTrafficGrants(t SeatTraffic) (pub, sub []string) {

go/buscompose/state.go

@@ -3,6 +3,7 @@ package buscompose
 import (
 	"fmt"
 	"git.novox.be/novox/mesh-sdk/go/announce"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 	"sort"
 	"strings"
 	"time"
@@ -166,6 +167,49 @@ func stateGrants(a stateAccess) []string {
 	return out
 }
 
+// StreamCreatedAdvisory is the subject the bus says a stream was created on (the server's own advisory), here for a
+// bucket's stream KV_<bucket>.
+func StreamCreatedAdvisory(bucket string) string {
+	return "$JS.EVENT.ADVISORY.STREAM.CREATED.KV_" + bucket
+}
+
+// stateCreatedHeard is what a principal subscribes to so that a bucket it may bind and that is not on the bus yet is
+// bound when it appears (novox/hq issue 1790, 2026-10-26: since the grants part creates a manifest's buckets, ADR 0547,
+// a module's delivery can start it before its new state exists): the bus's advisory that the bucket's stream was
+// created, for each bucket stateGrants lets it bind, and no other. Read-only: the server publishes it in the mesh's own
+// account, and hearing it changes nothing.
+func stateCreatedHeard(a stateAccess) []string {
+	var out []string
+	seen := map[string]bool{}
+	add := func(bucket string) {
+		if !seen[bucket] {
+			seen[bucket] = true
+			out = append(out, StreamCreatedAdvisory(bucket))
+		}
+	}
+	perMachine := map[string]bool{}
+	for _, n := range a.PerMachine {
+		perMachine[n] = true
+	}
+	for _, name := range a.Keeps {
+		if !safeSubject.MatchString(name) || (perMachine[name] && !safeSubject.MatchString(a.Node)) {
+			continue
+		}
+		add(BucketName(a.Module, name))
+	}
+	for _, r := range a.Reads {
+		if bucket, ok := bucketOfRead(r); ok {
+			add(bucket)
+		}
+	}
+	for _, k := range a.KeyedReads {
+		if bucket, ok := bucketOfRead(k.Read); ok && safeSubject.MatchString(k.Key) {
+			add(bucket)
+		}
+	}
+	return out
+}
+
 // KeyedRead is one key of another module's state a principal reads, and no other key of it.
 type KeyedRead struct {
 	Read string `json:"read"`
@@ -263,3 +307,53 @@ func RaiseBuckets(a BucketAsserter, buckets []Bucket) (undeclared []string, err
 	sort.Strings(undeclared)
 	return undeclared, nil
 }
+
+// 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 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.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/userlist_switch.go

@@ -0,0 +1,111 @@
+package buscompose
+
+import (
+	"slices"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// **The grants part's user list, sealed to the bus node** (novox/hq ADR 0547 clause 7, issue 1945). The grants part writes
+// the list it composed as one object of its own object bucket, sealed to the key of the node holding mesh-broker, and
+// names it in one key of its own state `user-list`. The node-engine of that node follows the key when the switch says
+// so (clause 8), opens the object and writes the bus's user-list file.
+//
+// Who may do what, and nothing more:
+//
+//   - the grants part writes its object bucket (create, put, purge of an object's old chunks, delete) and its own state
+//     as before;
+//   - the node-engine of the node holding mesh-broker reads that one key of the state, watched, and an object of the
+//     bucket by its name: never the bucket's list of names, never a write, never another key of the grants part's state;
+//   - no other principal touches either.
+
+// GrantsUserListBucket, GrantsUserListKey, GrantsUserListObjects and GrantsUserListObjectStream are delivery's names,
+// here where the grants are composed.
+const (
+	GrantsUserListBucket       = delivery.GrantsUserListBucket
+	GrantsUserListKey          = delivery.GrantsUserListKey
+	GrantsUserListObjects      = delivery.GrantsUserListObjects
+	GrantsUserListObjectStream = delivery.GrantsUserListObjectStream
+)
+
+// GrantsUserListFollows is what the node-engine of the node holding mesh-broker may publish to follow the grants part's
+// list: the one key `user-list.sealed` read and watched (its own ordered consumer, filtered on that key alone), and an
+// object of the bucket by its name, as a node reads its declaration's files (ADR 0486 §2: never STREAM.INFO of the object
+// stream, which lists every name, and never STREAM.MSG.GET).
+func GrantsUserListFollows() []string {
+	kv := "KV_" + GrantsUserListBucket
+	key := "$KV." + GrantsUserListBucket + "." + GrantsUserListKey
+	obj, s := GrantsUserListObjects, GrantsUserListObjectStream
+	return []string{
+		"$JS.API.DIRECT.GET." + kv + "." + key,
+		"$JS.API.CONSUMER.CREATE." + kv + ".*." + key,
+		"$JS.API.CONSUMER.DELETE." + kv + ".*",
+		"$JS.API.STREAM.INFO." + kv,
+		"$JS.FC." + kv + ".>",
+		"$JS.API.DIRECT.GET." + s + ".$O." + obj + ".M.*",
+		"$JS.API.CONSUMER.CREATE." + s + ".*.$O." + obj + ".C.*",
+		"$JS.API.CONSUMER.DELETE." + s + ".*",
+		"$JS.FC." + s + ".>",
+	}
+}
+
+// GrantsUserListWrites is what the grants part may publish to keep its object bucket: create it and read its info back,
+// put an object (its chunks and its metadata, the old chunks of a name purged), read an object's metadata, and delete
+// one. Its own state `user-list` it writes already, as every module writes its own.
+func GrantsUserListWrites() []string {
+	obj, s := GrantsUserListObjects, GrantsUserListObjectStream
+	return []string{
+		"$JS.API.STREAM.CREATE." + s,
+		"$JS.API.STREAM.INFO." + s,
+		"$JS.API.STREAM.PURGE." + s,
+		"$JS.API.DIRECT.GET." + s + ".>",
+		"$JS.API.STREAM.MSG.GET." + s,
+		"$O." + obj + ".>",
+	}
+}
+
+// grantsOwnObjects is the grants part writing its own object bucket, and nothing of another.
+func grantsOwnObjects(p Principal, pattern string) bool {
+	return p.Kind == KindModule && p.Module == GrantsModule &&
+		(pattern == "$O."+GrantsUserListObjects+".>" || pattern == "$JS.API.STREAM.CREATE."+GrantsUserListObjectStream)
+}
+
+// **Named readers** (novox/hq ADR 0547 clause 9, progressive insight of 2026-10-26; issue 1945). A state named here is
+// read by the modules named and by no other, whatever another module's `reads` says: the vault's `bus-accounts` holds
+// every bus account's bcrypt hash, and from take-over the grants part alone may read it. A module's announcement may name
+// readers too (announce.State.Readers); both are honoured.
+const VaultBusAccounts = "mesh-vault.bus-accounts"
+
+// NamedReaders are the states only the modules named may read, by `<owner>.<name>`.
+var NamedReaders = map[string][]string{VaultBusAccounts: {GrantsModule}}
+
+// ReaderMay says whether module may read the state read (`<owner>.<name>`) by the named readers: always, for a state
+// that names none.
+func ReaderMay(module, read string) bool {
+	readers, named := NamedReaders[read]
+	return !named || slices.Contains(readers, module)
+}
+
+// readsNamed splits a module's reads by the named readers: those it may read, and those named for others.
+func readsNamed(module string, reads []string) (granted, refused []string) {
+	for _, r := range reads {
+		if ReaderMay(module, strings.TrimSpace(r)) {
+			granted = append(granted, r)
+		} else {
+			refused = append(refused, r)
+		}
+	}
+	return granted, refused
+}
+
+// withNamedReaders is d with the reads named for other modules moved to its refused reads.
+func withNamedReaders(d Declared) Declared {
+	granted, refused := readsNamed(d.Module, d.Reads)
+	if len(refused) == 0 {
+		return d
+	}
+	d.Reads = granted
+	d.ReadsRefused = append(append([]string(nil), d.ReadsRefused...), refused...)
+	return d
+}

go/buscompose/userlist_switch_integration_test.go

@@ -0,0 +1,213 @@
+//go:build integration
+
+package buscompose
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/seal"
+	"github.com/nats-io/nats-server/v2/server"
+	"github.com/nats-io/nats.go"
+	"github.com/nats-io/nats.go/jetstream"
+)
+
+// Defends novox/hq ADR 0547 clause 7 on a real server (issue 1945): with the list this composer writes, the grants part
+// creates its object bucket and its state, puts the sealed list and names it in `user-list.sealed`; the node-engine of
+// the node holding mesh-broker watches that one key, reads the object by its name and opens it with its key, and may
+// neither list the bucket, nor read another key of the state, nor write; another node reads nothing of either.
+func TestTheBusNodeFollowsTheGrantsPartsSealedListUnderTheComposedGrants(t *testing.T) {
+	records := Records{
+		Nodes: []string{"novox", "ace"},
+		Assigned: map[string][]Declared{
+			"novox": {{Module: "nats", SnapshotsTheBus: true},
+				{Module: GrantsModule, State: []Bucket{{Module: GrantsModule, Name: "user-list"}}}},
+			"ace": {{Module: "plex"}},
+		},
+	}
+	users, err := Users(records)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := range users {
+		users[i].PasswordHash = "pw-" + users[i].Username()
+	}
+	accounts, err := ComposeAccounts(users)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dir := t.TempDir()
+	conf := filepath.Join(dir, "server.conf")
+	if err := os.WriteFile(conf, []byte("listen: 127.0.0.1:-1\njetstream { store_dir: \""+dir+"\" }\n"+accounts), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	opts, err := server.ProcessConfigFile(conf)
+	if err != nil {
+		t.Fatalf("the composed list is not the server's: %v", err)
+	}
+	opts.NoLog, opts.NoSigs = true, true
+	s, err := server.NewServer(opts)
+	if err != nil {
+		t.Fatal(err)
+	}
+	go s.Start()
+	if !s.ReadyForConnections(30 * time.Second) {
+		t.Fatal("the bus did not come up")
+	}
+	t.Cleanup(s.Shutdown)
+	dial := func(user string) *nats.Conn {
+		nc, err := nats.Connect(s.ClientURL(), nats.UserInfo(user, "pw-"+user), nats.CustomInboxPrefix("_INBOX."+user))
+		if err != nil {
+			t.Fatalf("%s: %v", user, err)
+		}
+		t.Cleanup(nc.Close)
+		return nc
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// The grants part: its state and its object bucket, the sealed list put and named.
+	grants, err := jetstream.New(dial("novox." + GrantsModule))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Its state is made as the grants part makes a declared state, by its stream's name (CreateKeyValue would ask the
+	// account's info, which no module is granted).
+	if _, err := grants.CreateStream(ctx, jetstream.StreamConfig{Name: "KV_" + GrantsUserListBucket,
+		Subjects: []string{"$KV." + GrantsUserListBucket + ".>"}, MaxMsgsPerSubject: 1, AllowDirect: true,
+		AllowRollup: true, DenyDelete: true, Discard: jetstream.DiscardNew}); err != nil {
+		t.Fatalf("the grants part's state: %v", err)
+	}
+	kv, err := grants.KeyValue(ctx, GrantsUserListBucket)
+	if err != nil {
+		t.Fatalf("the grants part binds its state: %v", err)
+	}
+	objects, err := grants.CreateObjectStore(ctx, jetstream.ObjectStoreConfig{Bucket: GrantsUserListObjects})
+	if err != nil {
+		t.Fatalf("the grants part's object bucket: %v", err)
+	}
+	node, err := seal.GenerateKeyPair()
+	if err != nil {
+		t.Fatal(err)
+	}
+	list := []byte(accounts)
+	digest := delivery.UserListDigest(list)
+	object, err := delivery.SealUserList(list, node.PublicKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	name := delivery.UserListObjectName(digest)
+	for range 2 { // put twice: a second put of a name purges its old chunks
+		if _, err := objects.PutBytes(ctx, name, object); err != nil {
+			t.Fatalf("the grants part put its object: %v", err)
+		}
+	}
+	value, err := delivery.EncodeGrantsUserList(delivery.GrantsUserList{Follow: delivery.FollowGrants, Digest: digest,
+		Object: name, SealedTo: delivery.SealingKeyID(node.PublicKey), Node: "novox", Revision: 1, Users: len(users)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := kv.Put(ctx, GrantsUserListKey, value); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := kv.Put(ctx, "list", []byte(`{"v":1}`)); err != nil {
+		t.Fatal(err)
+	}
+
+	// The bus node's engine: the key watched, the object by name (as mesh-host's link reads a declaration's file).
+	busNode := dial("node.novox")
+	js, err := busNode.JetStream(nats.MaxWait(5 * time.Second))
+	if err != nil {
+		t.Fatal(err)
+	}
+	keys, err := js.KeyValue(GrantsUserListBucket)
+	if err != nil {
+		t.Fatalf("the bus node binds the grants part's state: %v", err)
+	}
+	w, err := keys.Watch(GrantsUserListKey)
+	if err != nil {
+		t.Fatalf("the bus node watches the key: %v", err)
+	}
+	defer w.Stop()
+	var got delivery.GrantsUserList
+	select {
+	case e := <-w.Updates():
+		if e == nil {
+			t.Fatal("the watch found no value")
+		}
+		if got, err = delivery.DecodeGrantsUserList(e.Value()); err != nil {
+			t.Fatal(err)
+		}
+	case <-ctx.Done():
+		t.Fatal("the watch said nothing")
+	}
+	read := func(js nats.JetStreamContext, name string) ([]byte, error) {
+		meta, err := js.GetLastMsg(GrantsUserListObjectStream, "$O."+GrantsUserListObjects+".M."+
+			base64.URLEncoding.EncodeToString([]byte(name)), nats.DirectGet())
+		if err != nil {
+			return nil, err
+		}
+		var info struct {
+			NUID string `json:"nuid"`
+			Size int    `json:"size"`
+		}
+		if err := json.Unmarshal(meta.Data, &info); err != nil {
+			return nil, err
+		}
+		sub, err := js.SubscribeSync("$O."+GrantsUserListObjects+".C."+info.NUID, nats.OrderedConsumer(),
+			nats.BindStream(GrantsUserListObjectStream))
+		if err != nil {
+			return nil, err
+		}
+		defer sub.Unsubscribe()
+		var body []byte
+		for len(body) < info.Size {
+			m, err := sub.NextMsg(5 * time.Second)
+			if err != nil {
+				return nil, err
+			}
+			body = append(body, m.Data...)
+		}
+		return body, nil
+	}
+	body, err := read(js, got.Object)
+	if err != nil {
+		t.Fatalf("the bus node reads the object by its name: %v", err)
+	}
+	opened, err := delivery.OpenUserList(body, got.Digest, func(b seal.Box) ([]byte, error) {
+		s, err := seal.Open(b, node.PrivateKey)
+		return []byte(s), err
+	})
+	if err != nil || !bytes.Equal(opened, list) {
+		t.Fatalf("the bus node opened %d bytes, %v", len(opened), err)
+	}
+
+	// And nothing beyond: no other key, no list of the bucket, no write.
+	if _, err := keys.Get("list"); err == nil {
+		t.Error("the bus node read another key of the grants part's state")
+	}
+	if _, err := js.StreamInfo(GrantsUserListObjectStream); err == nil {
+		t.Error("the bus node read the object stream's info, which lists every name")
+	}
+	if _, err := js.Publish("$O."+GrantsUserListObjects+".M.x", []byte("x")); err == nil {
+		t.Error("the bus node wrote the grants part's bucket")
+	}
+	// Another node reads nothing of it.
+	other, err := dial("node.ace").JetStream(nats.MaxWait(2 * time.Second))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := read(other, got.Object); err == nil {
+		t.Error("another node read the object")
+	}
+	if _, err := other.GetLastMsg("KV_"+GrantsUserListBucket, "$KV."+GrantsUserListBucket+"."+GrantsUserListKey, nats.DirectGet()); err == nil {
+		t.Errorf("another node read the key: %v", err)
+	}
+}

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.
@@ -144,17 +148,24 @@ 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
+		bus := false
 		for _, d := range r.Assigned[node] {
 			if d.Module == controllerModule {
 				witness = true
 			}
+			if d.SnapshotsTheBus {
+				bus = true
+			}
 			checks = append(checks, d.Checks...)
 		}
 		out = append(out, Principal{Kind: KindNode, Node: node, WitnessesController: witness, Checks: checks,
-			MovesIntoTheVault: servesMoveIn(r), StatesItsKeyToTheVault: servesVerb(r, VaultNodeKey)})
+			MovesIntoTheVault: servesMoveIn(r), StatesItsKeyToTheVault: servesVerb(r, VaultNodeKey),
+			AsksItsOwnSecrets:     servesVerb(r, VaultOwn),
+			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] {
@@ -176,6 +187,9 @@ func Users(r Records) ([]Principal, error) {
 			}
 		}
 		for _, d := range r.Assigned[node] {
+			// A state with named readers is read by them alone (ADR 0547 clause 9): a read named for another module is
+			// granted nothing, here and in the runtime carrying the module.
+			d = withNamedReaders(d)
 			// **A process account is its own, delivered in its own secret** (broker-<process id>, novox/hq
 			// ADR 0436 §1, §2), never the module's `broker` — so it is composed whether or not the module
 			// itself has an account, and is never carried by the machine's runtime, which runs as the
@@ -223,6 +237,7 @@ func Users(r Records) ([]Principal, error) {
 			var carried []Declared
 			for _, d := range r.Assigned[node] {
 				if d.RunsAs == "" && runnerServes(d) {
+					d = withNamedReaders(d)
 					// Never a restricted stream for what the tool runner carries (novox/hq ADR 0376 §1).
 					d.Hears = ComposedHears(d)
 					carried = append(carried, d)
@@ -449,3 +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/buscompose/writers.go

@@ -44,6 +44,9 @@ func createsDeclared(p Principal, pattern string) bool {
 		return true
 	}
 	name, ok := strings.CutPrefix(pattern, "$JS.API.STREAM.CREATE.")
+	if ok && p.Kind == KindModule && p.Module == GrantsModule && name == GrantsUserListObjectStream {
+		return true
+	}
 	return ok && p.Kind == KindModule && p.Module == GrantsModule && slices.Contains(p.CreatesStreams, name) &&
 		safeSubject.MatchString(name)
 }
@@ -249,7 +252,10 @@ var WritersTable = []WriterRow{
 		KeptIn: "the object bucket " + DeclarationFilesBucket + "-<node> of each node, an object removed a day after the " +
 			"node's latest declaration no longer names it",
 		Others:   "a node-engine reads an object of its own bucket by its name and may neither list the bucket nor write it",
-		Subjects: []string{"$O.*.>"}, Writes: isControllerOrTheHandPath},
+		Subjects: []string{"$O.*.>"}, Writes: func(p Principal, pattern string) bool {
+			return isControllerOrTheHandPath(p, pattern) || grantsOwnObjects(p, pattern)
+		},
+		Shared: "the grants part writes its own object bucket " + GrantsUserListObjects + ", the user list sealed to the bus node, and no other (novox/hq ADR 0547 clause 7)"},
 	{State: "the declared-config mirror", Writer: "controller (lease holder), from its store, only on a change",
 		KeptIn: "key-value " + DeclaredConfigBucket, Others: "read through `reads` as mesh-controller." + MirrorDeclaredConfig,
 		Subjects: kvOf(DeclaredConfigBucket), Writes: isController},

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/delivery_seat.go

@@ -75,6 +75,19 @@ func deliveryVerbs() []Verb {
 			Input: schema(map[string]string{"id": "the delivery's id", "why": "the condition it answers"},
 				[]string{"id", "why"})},
 		deliveryRemovedInR6("retire-history"),
+		{Name: "settle", Description: "Ask the operator to settle deliveries held because their merge reached the " +
+			"trunk without a passing check: one ask on the operator's channel for all of them, as an Approve is asked. " +
+			"The verb moves nothing; on the operator's answer each goes to merged, and whether it is on the machines " +
+			"is derived as for any merge (novox/hq ADR 0556). Refused for a delivery not held, or held for another " +
+			"reason, naming why.",
+			Input: map[string]any{"type": "object", "additionalProperties": false, "required": []string{"ids", "why"},
+				"properties": map[string]any{
+					"ids": map[string]any{"type": "array", "items": map[string]any{"type": "string"}, "minItems": 1,
+						"description": "the held deliveries' ids (owner/repository@commit)"},
+					"why": map[string]any{"type": "string", "description": "why they may be settled, shown to the operator"},
+				}},
+			// Added after the seat's release 6 holder shipped: optional until the gate serves it everywhere.
+			Optional: true},
 	}
 }
 

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/holdings_test.go

@@ -172,7 +172,7 @@ func TestAStoreRowWithoutAProtocolKeepsTheCompiledOne(t *testing.T) {
 	t.Cleanup(func() { UseSeats(was) })
 	UseSeats([]Seat{{Name: "node-build-go", Scope: ScopeNode, Decision: "row"}})
 	got, ok := SeatNamed("node-build-go")
-	if !ok || len(got.Accepts) == 0 || !got.PulledByKind {
+	if !ok || len(got.Accepts) == 0 || !got.PulledByKind || !got.Yields {
 		t.Fatalf("the Go build seat lost what it accepts when loaded from the store: %+v", got)
 	}
 	if got.Decision != "row" {

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/runtime.go

@@ -311,6 +311,17 @@ func (r Resolution) ownRuntimes(with Rendering) ([]map[string]any, error) {
 		if words, err = r.readsWords(m, words, with); err != nil {
 			return nil, err
 		}
+		// A build seat's holder gives way on its node, and its steps are told their part of the node's share
+		// (novox/hq ADR 0553).
+		yielding, yieldWords := r.yieldsOf(m, with)
+		if len(yieldWords) > 0 {
+			if words == nil {
+				words = map[string]string{}
+			}
+			for k, v := range yieldWords {
+				words[k] = v
+			}
+		}
 		if len(words) > 0 {
 			body, err := json.Marshal(map[string]map[string]string{m.Module: words})
 			if err != nil {
@@ -329,6 +340,9 @@ func (r Resolution) ownRuntimes(with Rendering) ([]map[string]any, error) {
 			process[HealthField] = m.RuntimeHealth
 			healthInto(process, m, with)
 		}
+		if yielding != nil {
+			process["yields"] = yielding
+		}
 		if err := artifactsInto(process, RuntimeModule, with); err != nil {
 			return nil, err
 		}

go/catalogue/runtime_test.go

@@ -498,6 +498,54 @@ func TestAModuleOfItsOwnAccountIsServedByARuntimeOfItsOwn(t *testing.T) {
 	if _, told := env[RuntimeOperatorAccount]; told {
 		t.Error("a runtime of a module's own account is told the operator's account")
 	}
+	if _, yields := own["yields"]; yields {
+		t.Errorf("telegram holds no build seat and yields: %v", own["yields"])
+	}
+	// The build seats' holders yield (ADR 0553): idle, under the node's one share from the node-engine's build-cpu-share,
+	// and their steps are told it.
+	builder := func(name, seat string) Manifest {
+		b := aToolsModule(t, name, "tools/index.js")
+		b.RunsAs, b.SecretsOwner = name, name
+		b.OwnSecrets = OwnSecrets{"broker": {Path: "/var/lib/" + name + "/broker"}}
+		b.Claims = []Claim{{Name: seat}}
+		return b
+	}
+	gob, img := builder("gob", "node-build-go"), builder("img", "node-build-image")
+	with.Needed["gob"], with.Needed["img"] = map[string]string{"broker": "own"}, map[string]string{"broker": "own"}
+	for _, c := range []struct {
+		settings SettingsBy
+		share    string
+	}{
+		{nil, "50"},
+		{SettingsBy{"mesh-host": {{From: "anchor", Values: map[string]any{"build-cpu-share": float64(75)}}}}, "75"},
+		{SettingsBy{"mesh-host": {{From: "anchor", Values: map[string]any{"build-cpu-share": float64(0)}}}}, "50"},
+	} {
+		with.Settings = c.settings
+		runtimes, err := Resolution{Node: "anchor", Modules: []Manifest{gob, img, telegram, goRuntime}}.ownRuntimes(with)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(runtimes) != 3 {
+			t.Fatalf("%d runtimes of their own, want gob's, img's and telegram's", len(runtimes))
+		}
+		for _, p := range runtimes {
+			name := fmt.Sprint(p["name"])
+			words := map[string]map[string]string{}
+			_ = json.Unmarshal([]byte(p["env"].(map[string]string)[RuntimeToolEnv]), &words)
+			mod := strings.TrimSuffix(name, "-runtime")
+			if mod == "telegram" {
+				if p["yields"] != nil || words[mod]["MESH_BUILD_CPU_SHARE"] != "" {
+					t.Errorf("telegram yields under %v: %v %v", c.settings, p["yields"], words)
+				}
+				continue
+			}
+			if got := fmt.Sprint(p["yields"]); got != "map[cpu-share:"+c.share+" priority:idle]" ||
+				words[mod]["MESH_BUILD_CPU_SHARE"] != c.share {
+				t.Errorf("%s under %v yields %s with words %v; want share %s", name, c.settings, got, words[mod], c.share)
+			}
+		}
+	}
+	with.Settings = nil
 	// Without the machine's runtime to run it from, it is refused in words.
 	if _, err := (Resolution{Node: "anchor", Modules: []Manifest{telegram}}).ownRuntimes(with); err == nil {
 		t.Error("a module of its own account composed without a runtime program")

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

@@ -49,6 +49,11 @@ type Seat struct {
 	// order Accepts lists them (novox/hq ADR 0525 §2, ADR 0536 §4): the build seats'. Compiled, never stored, like
 	// Receives.
 	PulledByKind bool
+	// Yields says the seat's holder gives way to everything else on its node (novox/hq ADR 0553): its runtime runs at
+	// idle priority in the node's one yielding slice, under the node's one processor share (buildcpu.ShareSetting) that
+	// every yielding holder of the node shares. The build seats': a build must never slow the operator's desktop.
+	// Compiled, never stored, like Receives.
+	Yields bool
 	// Serves carries each verb in full — name, description, schema — because a role's tools are the
 	// mesh's to define and an agent's to call (novox/hq ADR 0132, design 33 §2).
 	Serves []Verb
@@ -204,6 +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{
@@ -243,6 +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.
@@ -256,11 +274,11 @@ var defaultSeats = append([]Seat{
 	// its holder taking nothing, kept on the module's own pause key (issue 1887's design limit 2). They replace
 	// node-build-agent, retired with build-agent (ADR 0524 §5).
 	{Name: "node-build-go", Scope: ScopeNode, Accepts: buildAskKinds(), PulledByKind: true, Serves: buildSeatVerbs("Go"),
-		Decision: "novox/hq ADR 0525, ADR 0536"},
+		Yields: true, Decision: "novox/hq ADR 0525, ADR 0536, ADR 0553"},
 	{Name: "node-build-node", Scope: ScopeNode, Accepts: buildAskKinds(), PulledByKind: true, Serves: buildSeatVerbs("Node"),
-		Decision: "novox/hq ADR 0525, ADR 0536"},
+		Yields: true, Decision: "novox/hq ADR 0525, ADR 0536, ADR 0553"},
 	{Name: "node-build-image", Scope: ScopeNode, Accepts: buildAskKinds(), PulledByKind: true, Serves: buildSeatVerbs("image"),
-		Decision: "novox/hq ADR 0525, ADR 0536"},
+		Yields: true, Decision: "novox/hq ADR 0525, ADR 0536, ADR 0553"},
 	// **The mesh's resolvers** (novox/hq ADR 0194, 0196, 0223): every node's internal domain, and
 	// every node and container asks them and nothing else. Replicated since ADR 0223: held on more
 	// than one machine, each answering the same names from the same roster, and every machine's
@@ -497,6 +515,7 @@ func UseSeats(s []Seat) {
 			row.Paths = d.Paths
 			row.Replicated = d.Replicated
 			row.PulledByKind = d.PulledByKind
+			row.Yields = d.Yields // never stored (ADR 0553)
 			row.Serves = optionalAsCompiled(row.Serves, d.Serves)
 		}
 		merged = append(merged, row)

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())
 	}
 }
@@ -324,6 +330,9 @@ func TestNodeBuildAgentIsRetiredForTheBuildSeats(t *testing.T) {
 		if !ok || s.Scope != ScopeNode || !s.PulledByKind || strings.Join(s.Accepts, ",") != "delivery,check,recheck" {
 			t.Fatalf("%s = %+v", name, s)
 		}
+		if !s.Yields {
+			t.Errorf("%s does not yield (ADR 0553)", name)
+		}
 		var verbs []string
 		for _, v := range s.Serves {
 			verbs = append(verbs, v.Name)
@@ -332,4 +341,14 @@ func TestNodeBuildAgentIsRetiredForTheBuildSeats(t *testing.T) {
 			t.Errorf("%s serves %v", name, verbs)
 		}
 	}
+	// The build seats are the seats that yield, and no other (ADR 0553 §1).
+	var yielding []string
+	for _, s := range Seats() {
+		if s.Yields {
+			yielding = append(yielding, s.Name)
+		}
+	}
+	if strings.Join(yielding, ",") != "node-build-go,node-build-node,node-build-image" {
+		t.Errorf("the seats that yield are %v", yielding)
+	}
 }

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/catalogue/verbs.go

@@ -126,6 +126,13 @@ var ControllerVerbs = []Verb{
 	{Name: "node", Description: "What one machine reported it can do, what it is assigned, and why.",
 		Input:    schema(map[string]string{"node": "the machine's name"}, []string{"node"}),
 		Replaces: []string{"hostnamectl", "uptime"}},
+	{Name: "placement-export", Description: "Each machine's placement as the catalogue's placement file says it (novox/hq ADR 0555 " +
+		"§6, issue 1126): what a person decided of the machine (endpoint, site, hub, address on the private network, public " +
+		"domain, accounts, adoption, the tunnel found at adoption) and where its modules run (in order, with host ports, " +
+		"bindings, config placement layers, pins and holdings), read by the controller's own code from its own store, as JSON. " +
+		"Read-only; the one verb the controller gains for its exit (the operator, 2026-10-26 19:06:40), read once by the seed " +
+		"of the placement files.",
+		Input: schema(map[string]string{"node": "one machine's name; every machine when absent"}, nil)},
 	{Name: "modules", Description: "Every module the mesh holds: version, the commit it was built from, " +
 		"and which machines run it.",
 		Input: schema(nil, nil)},

go/catalogue/verbs_r6_test.go

@@ -86,7 +86,7 @@ func TestTheDeliverySeatHasNoPlanVerbs(t *testing.T) {
 	if _, ok := rows["mark-ready"]; ok {
 		t.Errorf("mark-ready is still promised")
 	}
-	for _, kept := range []string{"deliveries", "show", "groups", "checks", "table", "recheck", "close", "stalled"} {
+	for _, kept := range []string{"deliveries", "show", "groups", "checks", "table", "recheck", "close", "stalled", "settle"} {
 		if v, ok := rows[kept]; !ok || strings.HasPrefix(v.Description, "Removed") {
 			t.Errorf("%s is not kept (ADR 0539 clause 17)", kept)
 		}

go/catalogue/yields.go

@@ -0,0 +1,69 @@
+package catalogue
+
+import (
+	"strconv"
+
+	"git.novox.be/novox/mesh-sdk/go/buildcpu"
+)
+
+// yieldsOf is how the runtime of its own a module is served by gives way on this node (novox/hq ADR 0553), or nil when
+// it does not, and the word its steps size their threads from:
+//
+//   - a module holding a seat that yields (Seat.Yields, the build seats) runs at idle priority under the node's one share
+//     of its processors: the node-engine's own config build-cpu-share (buildcpu.ShareSetting) as this node's layers give
+//     it, its default where none does. Every yielding module of the node carries the same share, so the node-engine's
+//     one yielding slice has one quota (ADR 0553 §2, §3).
+//   - its word: that share (buildcpu.ShareWord), which a step divides by its own module's capacity (ADR 0553 §4).
+//
+// Never a refusal: a share out of range is the default, so a mistyped value bounds the builds at the default and never
+// stops the node's whole composition.
+func (r Resolution) yieldsOf(m Manifest, with Rendering) (map[string]any, map[string]string) {
+	if !yields(m) {
+		return nil, nil
+	}
+	engine := Manifest{Module: engineModule}
+	for _, e := range r.Modules {
+		if e.Module == engineModule {
+			engine = e
+		}
+	}
+	share := buildcpu.DefaultPercent
+	for _, s := range Effective(engine, with.Settings[engineModule]) {
+		if s.Key == buildcpu.ShareSetting {
+			if n, ok := percentOf(s.Value); ok {
+				share = n
+			}
+		}
+	}
+	return map[string]any{"priority": "idle", "cpu-share": share},
+		map[string]string{buildcpu.ShareWord: strconv.Itoa(share)}
+}
+
+// yields is whether a module claims a seat that yields.
+func yields(m Manifest) bool {
+	for _, c := range m.Claims {
+		if s, ok := SeatNamed(c.Name); ok && s.Yields {
+			return true
+		}
+	}
+	return false
+}
+
+// percentOf is a setting's value as a percent from 1 to 100: a number, or a string holding one.
+func percentOf(v any) (int, bool) {
+	var n int
+	switch x := v.(type) {
+	case float64:
+		n = int(x)
+	case int:
+		n = x
+	case string:
+		var err error
+		if n, err = strconv.Atoi(x); err != nil {
+			return 0, false
+		}
+	default:
+		return 0, false
+	}
+	return n, n >= 1 && n <= 100
+}

go/compose/composed.go

@@ -2,42 +2,166 @@ package compose
 
 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) {
+	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
+// sealed copy, a vault box, the certificate, the bus's user list) or a port it does not give: what a send would make,
+// never what may be applied.
+var ErrStoodIn = errors.New("compose: the composition stands in for what its input does not carry")
+
+// BusUsersStandIn is what a composition says it stood in for when its input carries no bus user list.
+const BusUsersStandIn = "the bus's user list"
+
+// CompositionsApplied is Compositions for a node that applies what it composed itself (novox/hq ADR 0547 §2, issue
+// 1126): a declaration that stands in for anything (Declared.StoodIn, Foreseen, ForeseenPorts) is refused with
+// 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) {
+	out, skipped, _, err := compositions(in, node, fps, Reading, true)
+	return out, skipped, err
+}
+
+// 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)
+	}
+	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"`
@@ -46,19 +170,41 @@ func Compositions(in Input, node string, fps map[string]string, mode Mode) (out
 		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
@@ -69,18 +215,48 @@ func Compositions(in Input, node string, fps map[string]string, mode Mode) (out
 		}
 		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
@@ -90,5 +266,167 @@ func Compositions(in Input, node string, fps map[string]string, mode Mode) (out
 		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/credentials_needed.go

@@ -0,0 +1,64 @@
+package compose
+
+import (
+	"fmt"
+	"sort"
+)
+
+// CredentialKey names one pair credential by the ends it joins: the provision, the consumer's node and module, the
+// provider's node, and the local name where a module keeps several (Credential's and Issued's key).
+type CredentialKey struct {
+	Provision      string `json:"provision"`
+	Consumer       string `json:"consumer"`
+	ConsumerModule string `json:"consumer_module"`
+	Provider       string `json:"provider"`
+	Local          string `json:"local,omitempty"`
+}
+
+// CredentialsNeeded is every pair credential node's composition reads (novox/hq ADR 0547 §2, ADR 0550 §5, issue 1126):
+// as a consumer, each need of its resolution a provider's credential answers (a need answered by a record is a licence's,
+// not a pair's); as a provider, each credential it must carry a grant for (rowsFor). A node that composes its own asks the
+// vault for exactly these, sealed to its key, and composes with them; one it does not get is stood in for, which the
+// node's own apply refuses (CompositionsApplied).
+func CredentialsNeeded(in Input, node string) (asConsumer, asProvider []CredentialKey, err error) {
+	c := newComposer(in)
+	resolved, err := c.resolution(node)
+	if err != nil {
+		return nil, nil, err
+	}
+	for _, n := range resolved.Needs {
+		if n.ByRecord || n.From == "" {
+			continue
+		}
+		asConsumer = append(asConsumer, CredentialKey{Provision: n.Name, Consumer: node, ConsumerModule: n.For,
+			Provider: n.From, Local: n.Local})
+	}
+	rows, err := c.rowsFor(node)
+	if err != nil {
+		return nil, nil, fmt.Errorf("compose: the credentials %s provides: %w", node, err)
+	}
+	for _, r := range rows {
+		asProvider = append(asProvider, CredentialKey{Provision: r.Provision, Consumer: r.Consumer,
+			ConsumerModule: r.ConsumerModule, Provider: node, Local: r.Local})
+	}
+	sortKeys(asConsumer)
+	sortKeys(asProvider)
+	return asConsumer, asProvider, nil
+}
+
+func sortKeys(ks []CredentialKey) {
+	sort.Slice(ks, func(i, j int) bool {
+		a, b := ks[i], ks[j]
+		switch {
+		case a.Provision != b.Provision:
+			return a.Provision < b.Provision
+		case a.Provider != b.Provider:
+			return a.Provider < b.Provider
+		case a.Consumer != b.Consumer:
+			return a.Consumer < b.Consumer
+		case a.ConsumerModule != b.ConsumerModule:
+			return a.ConsumerModule < b.ConsumerModule
+		}
+		return a.Local < b.Local
+	})
+}

go/compose/credentials_test.go

@@ -2,6 +2,7 @@ package compose
 
 import (
 	"encoding/json"
+	"errors"
 	"strings"
 	"testing"
 
@@ -78,6 +79,16 @@ func TestAnOwnSecretHeldIsCarriedAndOneNotHeldIsForeseenOrLeftOut(t *testing.T)
 		t.Errorf("a held secret with no value is not named: %v", got.Rendering.Foreseen)
 	}
 	unchanged(t, mk, func(in Input) { rendered(t, in, "laptop", Foreseeing) })
+
+	// 1126 (ADR 0547 §2): a node applying what it composed itself never applies a stand-in: a held secret with no value in the
+	// Input is refused, naming it; held with its value, it composes.
+	fps := map[string]string{"assistant": "src2:" + strings.Repeat("a", 64), overlay.Name: "src2:" + strings.Repeat("b", 64)}
+	if _, _, err := CompositionsApplied(in, "laptop", fps); !errors.Is(err, ErrStoodIn) || !strings.Contains(err.Error(), "assistant/password") {
+		t.Errorf("a stand-in was not refused for a node's own apply: %v", err)
+	}
+	if out, _, err := CompositionsApplied(mk(), "laptop", fps); err != nil || len(out) == 0 {
+		t.Errorf("a held secret with its value is refused for a node's own apply: %v", err)
+	}
 }
 
 // An own secret issued outside the mesh that nobody gave is never made (novox/hq issue 401, ADR 0228): nothing is composed or
@@ -161,6 +172,15 @@ func aGrantMesh(t *testing.T) Input {
 // the sealed copy a stand-in is composed and named (novox/hq plan.go grantsFor).
 func TestAGrantIsCreatedForEachCredentialMadeForAConsumer(t *testing.T) {
 	in := aGrantMesh(t)
+	// 1126 (ADR 0550 §5): the credentials each node's composition reads, by their ends: laptop's files consumes anchor's
+	// s3-bucket, and anchor grants it; the node composing its own asks the vault for exactly these.
+	pair := CredentialKey{Provision: "s3-bucket", Consumer: "laptop", ConsumerModule: "files", Provider: "anchor"}
+	if consumer, provider, err := CredentialsNeeded(in, "laptop"); err != nil || len(provider) != 0 || len(consumer) != 1 || consumer[0] != pair {
+		t.Errorf("laptop needs %v as consumer and %v as provider (%v), want %v as consumer", consumer, provider, err, pair)
+	}
+	if consumer, provider, err := CredentialsNeeded(in, "anchor"); err != nil || len(consumer) != 0 || len(provider) != 1 || provider[0] != pair {
+		t.Errorf("anchor needs %v as consumer and %v as provider (%v), want %v as provider", consumer, provider, err, pair)
+	}
 	got := rendered(t, in, "anchor", Foreseeing)
 	if len(got.Rendering.Grants) != 1 {
 		t.Fatalf("grants are %+v", got.Rendering.Grants)

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
+}