A taken container keeps a found network, a left-out module is kept, and genesis raises the forge as its module declares (hq ADR 0163)

A container may name networks it also joins once created, for the per-machine
setting that keeps a found network while a neighbour still resolves it there:
joined after the run, part of the spec, refused when it cannot be joined.

A declaration may say which modules the mesh left out because a stored setting
cannot compose with its definition. Absence used to read as removal; a left-out
module's records are kept and said, and its holds are not released.

Genesis raises the bootstrap forge under the gitea module's container name, with
its image digest and its data directory mounted at /data, so the module holds it
by the found rule instead of raising a second forge beside it (issue 090). The
network is the one difference left for a take to say. Before this the forge had
no volume: its repositories were the container's, lost with it.

cmd/mesh-host/main.go

@@ -51,6 +51,43 @@ var builtFor = ""
 
 var version = "development build"
 
+// runningVersion is this host's version: the directory it was delivered into, or the link-time stamp
+// for one placed by hand.
+//
+// **From where it sits, not from its linker** (novox/hq ADR 0142): "It is unpacked into a directory
+// named for its version, so it can read its own version from its path. The stamp goes, and with it the
+// need for a build to know what it will be called."
+//
+// The mesh's toolchain does not stamp a version, on purpose — a build does not know what it will be
+// called — so a delivered host read as "development build" and the mesh could not tell which host any
+// machine ran (novox/hq 04-ISSUES/161, and 087 for why that matters). The path knows: a delivered host
+// lives at `<libexec>/versions/<version>/<binary>`.
+//
+// A host placed by hand keeps its stamp, which is the honest answer for one the mesh did not deliver.
+func runningVersion() string {
+	self, err := os.Executable()
+	if err != nil {
+		return version
+	}
+	return versionAt(self, version)
+}
+
+// versionAt is runningVersion's decision, with the executable's path and the link-time stamp given —
+// so a test can ask it about a path without being that binary.
+func versionAt(self, stamped string) string {
+	// .../versions/<version>/<binary> — the parent is the version, and its parent is the versions
+	// directory. Checked rather than assumed, so a binary somewhere else does not read a directory
+	// name as a version.
+	dir := filepath.Dir(self)
+	if filepath.Base(filepath.Dir(dir)) != upgrade.VersionsDirName {
+		return stamped
+	}
+	if name := filepath.Base(dir); name != "" && name != "." && name != string(filepath.Separator) {
+		return name
+	}
+	return stamped
+}
+
 const usage = `mesh-host — the node host
 
   profile     what this machine can be asked to do
@@ -254,7 +291,7 @@ func run(ctx context.Context, command string, opts options) error {
 		return runLink(ctx, opts)
 
 	case "version":
-		fmt.Println(version)
+		fmt.Println(runningVersion())
 		return nil
 
 	case "", "help", "-h", "--help":
@@ -420,10 +457,10 @@ func short(digest string) string {
 // them again — and everything the mesh declared read as no longer declared and removed. Even the
 // very declaration the mesh last sent, applied from a file, would plan to remove the foundation.
 // `apply FILE` is for a machine the mesh has not spoken to, and is refused saying so.
-func refuseStale(known store.State, kept store.Declared, keptErr error, digest string, from provenance) error {
+func refuseStale(known store.State, kept store.Declared, keptErr error, digest string, from provenance, sequence int64) error {
 	switch from {
 	case fromDeclared:
-		return nil
+		return refuseOlder(kept, keptErr, sequence)
 	case fromBundle:
 		if known.Genesis == nil || known.Genesis.Digest == digest {
 			return nil
@@ -520,7 +557,7 @@ func runApply(ctx context.Context, opts options, d *declaration.Declaration, raw
 	if err := apply.CheckMode(known, d); err != nil {
 		return err
 	}
-	if err := refuseStale(known, kept, keptErr, digest, from); err != nil {
+	if err := refuseStale(known, kept, keptErr, digest, from, d.Sequence); err != nil {
 		return err
 	}
 
@@ -594,8 +631,8 @@ func runApply(ctx context.Context, opts options, d *declaration.Declaration, raw
 	//
 	// A failure to record is reported and does not fail the apply. The apply worked; what is
 	// lost is a rollback's ability to come back here, which is worse to hide than to say.
-	if version != "" {
-		if err := upgrade.RecordKnownGood(upgrade.KnownGoodPath(opts.state), version); err != nil {
+	if v := runningVersion(); v != "" {
+		if err := upgrade.RecordKnownGood(upgrade.KnownGoodPath(opts.state), v); err != nil {
 			fmt.Fprintf(os.Stderr,
 				"mesh-host: applied, but could not record %s as known-good: %v\n"+
 					"  a rollback would have nothing to return to.\n", version, err)
@@ -781,10 +818,7 @@ func enrol(ctx context.Context, opts options) error {
 	// control plane cannot decide what a node should run without it, so it travels with the
 	// request instead of being asked for in a second round trip.
 	detected := profile.Detect(ctx, profile.Default(nil), opts.timeout)
-	reported := map[string]any{}
-	if raw, err := json.Marshal(detected); err == nil {
-		_ = json.Unmarshal(raw, &reported)
-	}
+	reported := profileAsReported(detected)
 
 	// Signed with the identity just generated, so the mesh can tell this machine from anyone else
 	// who knows its public key (novox/hq issue 083).
@@ -816,6 +850,13 @@ func enrol(ctx context.Context, opts options) error {
 		Fingerprint: firstNonEmpty(reply.Fingerprint, token.Fingerprint),
 		Signer:      firstNonEmpty2(reply.Signer, token.Signer),
 		Password:    reply.Password,
+		// **Which bus this membership is for, said rather than left empty** (novox/hq
+		// 04-ISSUES/146). The link refuses a membership that names another bus, and an empty name
+		// is not this one's — so a node enrolled without it came up and reconnected for ever
+		// against its own record: "this membership is for \"\", and the mesh's bus is nats". The
+		// reply does not carry it because there is one bus and the host knows which (ADR 0131);
+		// what was missing was writing that down where the link reads it.
+		Transport: link.OnNATS,
 	}
 	if mine.Membership.Password == "" {
 		// The mesh did not replace the token's secret, so it is still this node's broker
@@ -1017,7 +1058,12 @@ func runLink(ctx context.Context, opts options) error {
 		// standing before this machine leaves the one it is on (novox/hq design 28, task 5.2).
 		adoptDeliveredMembership(identity.Path(opts.state), &mine, say)
 
-		switch next, waiting, err := upgrade.Successor(upgrade.VersionsDir(""), version); {
+		// Asked with the version this host is RUNNING, read from where it sits — not the link-time
+		// stamp, which every delivered host carries as "development build". Asked with the stamp,
+		// a delivered host never matched the newest delivered version, so it stood aside on every
+		// push for ever, and standing aside cancels the report, so the mesh never heard from it
+		// again (novox/hq 04-ISSUES/163).
+		switch next, waiting, err := upgrade.Successor(upgrade.VersionsDir(""), runningVersion()); {
 		case err != nil:
 			// Said, not fatal. A host that cannot read the delivered versions is still running this
 			// machine correctly; what it has lost is the ability to be replaced.
@@ -1369,7 +1415,8 @@ func applyAndKeep(ctx context.Context, opts options, raw []byte, signed *store.D
 		sched.Sync(declared, held)
 	}
 
-	report := link.Report{Carried: carriedPorts(updated), Declared: digestOf(raw), Host: version}
+	report := link.Report{Carried: carriedPorts(updated), Declared: digestOf(raw), Host: runningVersion(),
+		Profile: profileAsReported(profile.Detect(ctx, profile.Default(nil), opts.timeout))}
 	// Which of this machine's links face outside, for the filter the mesh writes around them
 	// (novox/hq ADR 0140). Reported whatever the node's mode: a converged node's filter needs it,
 	// and an adopted one becomes converged without a further round trip. A machine that cannot read
@@ -1383,7 +1430,15 @@ func applyAndKeep(ctx context.Context, opts options, raw []byte, signed *store.D
 	// node never reads as converged (novox/hq ADR 0100).
 	for _, h := range updated.Held {
 		report.Held = append(report.Held, link.Held{ID: h.ID, Module: h.Module, Kind: h.Kind,
-			Target: h.Target, Since: h.Since, Changed: h.Changed, Kept: h.Kept})
+			Target: h.Target, Since: h.Since, Changed: h.Changed, Kept: h.Kept, Facts: factsAsReported(h.Facts)})
+	}
+	// And what runs here that nobody asked for (novox/hq ADR 0163).
+	if strays, err := apply.Strays(ctx, apply.ExecRunner, updated); err != nil {
+		fmt.Fprintf(os.Stderr, "mesh-host: applied, and could not list what else runs here: %v\n", err)
+	} else {
+		for _, s := range strays {
+			report.Strays = append(report.Strays, link.Stray{Kind: s.Kind, Name: s.Name, Detail: s.Detail})
+		}
 	}
 	if declared.Adoption != nil {
 		if updated.Firewall != nil {
@@ -1552,3 +1607,54 @@ func adoptDeliveredMembership(identityPath string, mine *identity.Identity, say
 	say(fmt.Sprintf("moving to the %s bus at %s — restarting to dial it", next.Transport, next.Broker))
 	os.Exit(0)
 }
+
+// refuseOlder refuses a declaration from the mesh that is older than the one this node holds.
+//
+// **By sequence, not by arrival** (novox/hq 04-ISSUES/107). What the host kept is the last thing
+// the mesh said, signed; a declaration whose sequence is lower was composed before it, whatever
+// order they arrived in — a backlog drained after the node was away, or a broker that split a burst.
+// Applying it would make the machine into something the mesh had already moved past, which is the
+// incident of issue 104 by another door.
+//
+// Only when both sides claim an order. A declaration with no sequence is one an older controller
+// sent, and one kept with no sequence is one this host received before it understood them; in either
+// case there is no order to compare, and refusing on a guess would strand the node the moment the
+// controller is older than the host. Equal is the same declaration again, which reconciling is for.
+func refuseOlder(kept store.Declared, keptErr error, sequence int64) error {
+	if sequence == 0 || keptErr != nil {
+		return nil
+	}
+	last, err := declaration.ParseTrusted(kept.Declaration)
+	if err != nil || last.Sequence == 0 {
+		return nil
+	}
+	if sequence < last.Sequence {
+		return fmt.Errorf("this declaration is older than what the mesh last said to this node: it "+
+			"is sequence %d, and the one kept here is %d. It arrived late — a backlog, or a broker "+
+			"that split a burst — and applying it would make this machine into something the mesh has "+
+			"already moved past. Refused whole; nothing was applied", sequence, last.Sequence)
+	}
+	return nil
+}
+
+// profileAsReported is the profile as the mesh reads it — the same bytes enrolment sends, so a
+// report's profile and an enrolment's are one shape on the controller's side (novox/hq ADR 0161).
+func profileAsReported(detected profile.Profile) map[string]any {
+	reported := map[string]any{}
+	if raw, err := json.Marshal(detected); err == nil {
+		_ = json.Unmarshal(raw, &reported)
+	}
+	return reported
+}
+
+// factsAsReported is a held thing's facts as the mesh reads them: the same bytes the host keeps.
+func factsAsReported(f *store.Facts) map[string]any {
+	if f == nil {
+		return nil
+	}
+	out := map[string]any{}
+	if raw, err := json.Marshal(f); err == nil {
+		_ = json.Unmarshal(raw, &out)
+	}
+	return out
+}

cmd/mesh-host/order_test.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-host/internal/store"
+)
+
+// A declaration carries no order, so a host cannot tell an older one from a newer (novox/hq
+// 04-ISSUES/107). Its only identity was the digest of its bytes: "not the last" could be said,
+// "older" could not.
+
+func keptWith(t *testing.T, sequence int64) store.Declared {
+	t.Helper()
+	body, err := json.Marshal(map[string]any{
+		"declaration": 1, "resources": []any{}, "owns_nothing": true, "sequence": sequence,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return store.Declared{Declaration: body, Signature: []byte("x")}
+}
+
+func TestAnOlderDeclarationFromTheMeshIsRefused(t *testing.T) {
+	err := refuseOlder(keptWith(t, 7), nil, 5)
+	if err == nil {
+		t.Fatal("sequence 5 was accepted over a kept 7")
+	}
+	if !strings.Contains(err.Error(), "older") || !strings.Contains(err.Error(), "nothing was applied") {
+		t.Fatalf("the refusal does not say what it is: %v", err)
+	}
+}
+
+func TestANewerOrEqualDeclarationIsNot(t *testing.T) {
+	if err := refuseOlder(keptWith(t, 7), nil, 8); err != nil {
+		t.Fatalf("sequence 8 was refused over a kept 7: %v", err)
+	}
+	// Equal is the same declaration again, which reconciling is for.
+	if err := refuseOlder(keptWith(t, 7), nil, 7); err != nil {
+		t.Fatalf("the same sequence was refused: %v", err)
+	}
+}
+
+func TestNoOrderClaimedMeansNoOrderCompared(t *testing.T) {
+	// An older controller sends none; a host that received before it understood them kept none.
+	// Refusing on a guess would strand a node the moment the controller is older than the host.
+	if err := refuseOlder(keptWith(t, 7), nil, 0); err != nil {
+		t.Fatalf("a declaration claiming no order was refused: %v", err)
+	}
+	if err := refuseOlder(keptWith(t, 0), nil, 3); err != nil {
+		t.Fatalf("a declaration was refused against a kept one that claimed no order: %v", err)
+	}
+	if err := refuseOlder(store.Declared{}, store.ErrNothingDeclared, 3); err != nil {
+		t.Fatalf("a first declaration was refused: %v", err)
+	}
+}

cmd/mesh-host/version_from_path_test.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// A component's version comes from where it sits, not from its linker (novox/hq ADR 0142). The mesh's
+// toolchain stamps no version — a build does not know what it will be called — so a delivered host
+// read as "development build" and the mesh could not tell which host a machine ran (04-ISSUES/161).
+
+func TestADeliveredHostReadsItsVersionFromItsPath(t *testing.T) {
+	// A delivered host lives at <libexec>/versions/<version>/<binary>.
+	dir := t.TempDir()
+	versioned := filepath.Join(dir, "versions", "637f65559d16")
+	if err := os.MkdirAll(versioned, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	self := filepath.Join(versioned, "nox-mesh-host")
+	if err := os.WriteFile(self, []byte("#!/bin/sh\n"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if got := versionAt(self, "development build"); got != "637f65559d16" {
+		t.Fatalf("a delivered host read its version as %q", got)
+	}
+}
+
+func TestAHostPlacedByHandKeepsItsStamp(t *testing.T) {
+	// The honest answer for one the mesh did not deliver — and every machine is in that state until
+	// a delivery reaches it.
+	if got := versionAt("/usr/bin/nox-mesh-host", "04a27ca"); got != "04a27ca" {
+		t.Fatalf("a hand-placed host read its version as %q", got)
+	}
+}
+
+func TestADirectoryThatIsNotAVersionIsNotReadAsOne(t *testing.T) {
+	// A binary sitting anywhere else must not have its parent directory's name read as a version.
+	for _, path := range []string{
+		"/opt/somewhere/nox-mesh-host",
+		"/usr/lib/nox-mesh-host/launch",
+		"/home/someone/build/nox-mesh-host",
+	} {
+		if got := versionAt(path, "the stamp"); got != "the stamp" {
+			t.Fatalf("%s read its version as %q", path, got)
+		}
+	}
+}

examples/foundation-first-node-nats.lock

@@ -161,7 +161,7 @@
       "type": "file",
       "path": "/var/lib/mesh-bus-conf/accounts.conf",
       "mode": "0600",
-      "content": "// The first user list, carried by the installer because at genesis there is no mesh to\n// compose one. A bootstrap credential, rotated with the store's and replaced by the\n// controller's own composition from its first start onward.\naccounts {\n  MESH {\n    jetstream: enabled\n    users = [\n      { user: \"controller\", password: \"$2a$10$AHqJgOifIVbU41KmATiMhuXFs8xa7Wl2HuN4UVBCXdN2jIQzjqApy\", permissions: {\n        publish: { allow: [\"$JS.API.>\", \"$JS.ACK.CONTROL.controller.>\", \"$JS.ACK.EVENTS.controller.>\", \"_INBOX.enrol.>\", \"mesh.control.>\", \"mesh.mod.*.tool.>\", \"mesh.node.>\", \"mesh.seat.mesh-build-machine.accept.>\", \"mesh.seat.mesh-controller.event.applied\", \"mesh.seat.mesh-controller.event.built-before\", \"mesh.seat.mesh-controller.event.refused\"] }\n        subscribe: { allow: [\"$JS.API.>\", \"_DELIVER.controller\", \"_DELIVER.controller.>\", \"_INBOX.controller.>\", \"mesh.control.>\", \"mesh.mod.mesh-catalog.event.catching-up\", \"mesh.mod.mesh-catalog.event.upgraded\", \"mesh.mod.gitea.event.pull.merged\", \"mesh.seat.mesh-build-machine.event.built\"] }\n        allow_responses: { max: 1, ttl: \"1m\" }\n      } }\n    ]\n  }\n}\n"
+      "content": "// The first user list, carried by the installer because at genesis there is no mesh to\n// compose one. A bootstrap credential, rotated with the store's and replaced by the\n// controller's own composition from its first start onward.\naccounts {\n  MESH {\n    jetstream: enabled\n    users = [\n      { user: \"controller\", password: \"$2a$10$AHqJgOifIVbU41KmATiMhuXFs8xa7Wl2HuN4UVBCXdN2jIQzjqApy\", permissions: {\n        publish: { allow: [\"$JS.ACK.CONTROL.controller.>\", \"$JS.ACK.EVENTS.controller.>\", \"$JS.API.>\", \"_INBOX.enrol.>\", \"mesh.assignment.>\", \"mesh.control.>\", \"mesh.mod.*.tool.>\", \"mesh.node.>\", \"mesh.seat.mesh-build-machine.accept.>\", \"mesh.seat.mesh-controller.event.applied\", \"mesh.seat.mesh-controller.event.built-before\", \"mesh.seat.mesh-controller.event.refused\"] }\n        subscribe: { allow: [\"$JS.API.>\", \"_DELIVER.controller\", \"_DELIVER.controller.>\", \"_INBOX.controller.>\", \"mesh.control.>\", \"mesh.mod.gitea.event.pull.merged\", \"mesh.mod.mesh-catalog.event.catching-up\", \"mesh.mod.mesh-catalog.event.upgraded\", \"mesh.seat.mesh-build-machine.event.built\", \"mesh.seat.mesh-controller.tool.>\"] }\n        allow_responses: { max: 1, ttl: \"1m\" }\n      } }\n    ]\n  }\n}\n"
     },
     {
       "id": "broker",

internal/apply/apply.go

@@ -20,6 +20,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -230,6 +231,18 @@ func ApplyKeeping(
 			protecting = append(protecting, orphan)
 			continue
 		}
+		// **A module the mesh left out is not a module the mesh removed** (novox/hq ADR 0163, rule
+		// 6): its resources are absent because a setting stored for it cannot compose, and the
+		// mesh said so by name. What the host wrote for it stays as it is, recorded, until the
+		// module is declared again or unassigned.
+		if module, left := d.LeftOutModuleOf(orphan.ID); left {
+			report.Outcomes = append(report.Outcomes, Outcome{
+				ID: orphan.ID, Type: orphan.Type, Target: orphan.Target,
+				Action: "unchanged", Detail: "kept: " + module + " was left out of this declaration by the mesh, not removed",
+			})
+			log(fmt.Sprintf("  kept %s (%s): %s was left out of this declaration by the mesh, not removed", orphan.ID, orphan.Target, module))
+			continue
+		}
 		orphans = append(orphans, orphan)
 	}
 	ordered := d.Resources
@@ -270,6 +283,11 @@ func ApplyKeeping(
 			if declared[h.ID] {
 				continue
 			}
+			if slices.Contains(d.LeftOut, h.Module) {
+				// Left out, not unassigned (ADR 0163, rule 6): still held for the module, as the
+				// mesh asked.
+				continue
+			}
 			known.Release(h.ID)
 			report.Outcomes = append(report.Outcomes, Outcome{ID: h.ID, Type: h.Kind, Target: h.Target,
 				Action: "forgotten", Detail: "no longer declared; left as found"})
@@ -1501,13 +1519,15 @@ func containerSpecReading(r *declaration.Container, declares, reads map[string]s
 	for _, a := range r.Args {
 		b.WriteString("arg " + a + "\n")
 	}
-	// **The mesh's names are part of what a container is** (novox/hq 04-ISSUES/135). A container
-	// resolves every other machine and every public name through the entries the mesh gives it at
-	// creation, and nothing re-reads them afterwards — so a container left alone when the roster
-	// moved is one that cannot reach anything by name, for ever, while every check reports it
-	// running. That is exactly what happened when this mesh's overlay range changed: one container
-	// whose image and files never changed kept an address five days out of date and restarted
-	// 2286 times against a database it could no longer find.
+	// **A container's declared names are part of what it is** (novox/hq 04-ISSUES/135). What is
+	// here is what the module declared for itself and nothing else: the mesh's own names are no
+	// longer written into a container (ADR 0148) — they were once, every container got the whole
+	// roster at creation and nothing re-read it, so one left alone when the roster moved could not
+	// reach anything by name for as long as it ran while every check reported it running; and once
+	// the roster was in this digest so that could be caught, one name moving anywhere replaced
+	// every container in the mesh (04-ISSUES/151). A container resolves a mesh name through the
+	// machine's resolver at the moment it asks. What a module declares does not move when the
+	// roster does, so hashing it costs nothing and catches a manifest that changed.
 	//
 	// Sorted, so the digest does not move for a reordering nobody made.
 	hosts := append([]string(nil), r.Hosts...)
@@ -1524,6 +1544,11 @@ func containerSpecReading(r *declaration.Container, declares, reads map[string]s
 	if r.IP != "" {
 		b.WriteString("ip " + r.IP + "\n")
 	}
+	// The networks it also joins are part of what it is (ADR 0163, rule 4): kept or let go, the
+	// container is recreated, and a neighbour's reach changes with it.
+	for _, n := range r.Networks {
+		b.WriteString("also-on " + n + "\n")
+	}
 	// The cadence is part of what was declared, so a changed schedule is a changed spec — the marker
 	// moves and the install is reported "updated" and re-established. Added only when present, so no
 	// ordinary container's or run-once step's digest moves for a field it does not set.
@@ -1764,6 +1789,15 @@ func applyContainer(ctx context.Context, r *declaration.Container, run Runner,
 	if after.Spec != want {
 		return out, fmt.Errorf("container %s is not the one that was declared after creating it", r.Name)
 	}
+	// The found networks a per-machine setting keeps for it (novox/hq ADR 0163, rule 4), joined
+	// once it runs: a runtime starts a container on one network, and the others are connected.
+	// Refused, not skipped, when one cannot be joined — a neighbour that was promised to keep
+	// reaching this container by name would silently not.
+	for _, n := range r.Networks {
+		if _, err := run(ctx, cri, "network", "connect", n, r.Name); err != nil {
+			return out, fmt.Errorf("container %s could not join the kept network %s: %w", r.Name, n, err)
+		}
+	}
 
 	out.Action = "created"
 	if existed {

internal/apply/facts_test.go

@@ -0,0 +1,97 @@
+package apply
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-host/internal/store"
+)
+
+// A take is a comparison (novox/hq ADR 0163): while a module's container is held, the host reports
+// the found image and its age beside the declared one, the networks and who else is on them, the
+// mounts and the ports — and says when the declared image is the older.
+func TestAHeldContainerCarriesTheFactsATakeCompares(t *testing.T) {
+	dir, page, m := predecessor(t)
+	m.containers["hello-web"].image = "web:1.27"
+	m.containers["hello-web"].imageID = "sha256:found"
+	m.containers["hello-web"].networks = []string{"predecessor_default"}
+	m.containers["hello-web"].mounts = []string{"/srv/web:/data"}
+	m.containers["hello-web"].ports = []string{"80/tcp>0.0.0.0:8080"}
+	m.images = map[string]string{"sha256:found": "2026-09-17T10:00:00Z", pinned: "2026-08-20T10:00:00Z"}
+	m.members = map[string][]string{"predecessor_default": {"hello-web", "office", "db"}}
+
+	_, state := applyAdopted(t, adopted(t, untakenWeb, webResources(page)), store.State{}, m, dir)
+	h, ok := state.HeldAt("hello-web.server")
+	if !ok || h.Facts == nil {
+		t.Fatalf("a held container carries no facts: %+v", h)
+	}
+	f := h.Facts
+	if f.Image != "web:1.27" || f.ImageCreated != "2026-09-17T10:00:00Z" {
+		t.Errorf("the found image and its age: %+v", f)
+	}
+	if f.DeclaredImage != pinned || f.DeclaredImageCreated != "2026-08-20T10:00:00Z" || !f.Downgrade {
+		t.Errorf("the declared image, its age, and that it is a downgrade: %+v", f)
+	}
+	if got := f.Networks["predecessor_default"]; len(got) != 2 || got[0] != "db" || got[1] != "office" {
+		t.Errorf("the neighbours on the found network, without the container itself: %v", f.Networks)
+	}
+	if len(f.Mounts) != 1 || f.Mounts[0] != "/srv/web:/data" || len(f.Ports) != 1 || f.Ports[0] != "80/tcp>0.0.0.0:8080" {
+		t.Errorf("mounts and ports as found: %+v", f)
+	}
+	// And the held file carries how the declared content differs from what was found.
+	p, ok := state.HeldAt("hello-web.page")
+	if !ok || p.Facts == nil || !p.Facts.Differs {
+		t.Fatalf("a held file that differs from the declared content does not say so: %+v", p)
+	}
+	joined := strings.Join(p.Facts.Difference, "\n")
+	if !strings.Contains(joined, "- the predecessor's page") || !strings.Contains(joined, "+ the mesh's page") {
+		t.Errorf("the difference does not show what is lost and what is new: %q", joined)
+	}
+	_ = os.Remove(filepath.Join(dir, "unused"))
+}
+
+// A declared image not yet on the machine leaves its age unknown and the comparison undecided.
+func TestAnImageNotYetPulledLeavesTheDowngradeUndecided(t *testing.T) {
+	dir, page, m := predecessor(t)
+	m.containers["hello-web"].image = "web:1.27"
+	m.containers["hello-web"].imageID = "sha256:found"
+	m.images = map[string]string{"sha256:found": "2026-09-17T10:00:00Z"}
+	_, state := applyAdopted(t, adopted(t, untakenWeb, webResources(page)), store.State{}, m, dir)
+	h, _ := state.HeldAt("hello-web.server")
+	if h.Facts == nil || h.Facts.DeclaredImageCreated != "" || h.Facts.Downgrade {
+		t.Fatalf("an unknown declared age decided a downgrade: %+v", h.Facts)
+	}
+}
+
+func TestTheDifferenceIsWhatIsLostAndWhatIsNew(t *testing.T) {
+	differs, lines := differenceOf("a\nprivate scope: local\nb\n", "a\nb\nupstream: public\n")
+	if !differs || len(lines) != 2 || lines[0] != "- private scope: local" || lines[1] != "+ upstream: public" {
+		t.Fatalf("got %v %v", differs, lines)
+	}
+	if differs, lines := differenceOf("same\n", "same\n"); differs || lines != nil {
+		t.Fatalf("identical content differs: %v %v", differs, lines)
+	}
+}
+
+// What runs on the machine that the mesh neither wrote nor holds is reported (ADR 0163).
+func TestStraysAreWhatRunsHereThatNobodyAsked(t *testing.T) {
+	m := &machine{containers: map[string]*fakeContainer{
+		"hello-web":  {id: "ours", running: true, image: "web:1"},
+		"gitea-old":  {id: "left-behind", running: true, image: "gitea:1.22"},
+		"held-thing": {id: "found", running: true, image: "x:1"},
+	}}
+	known := store.State{
+		Resources: []store.Applied{{ID: "hello-web.server", Type: "container", Target: "hello-web"}},
+		Held:      []store.Held{{ID: "other.server", Kind: "container", Target: "held-thing"}},
+	}
+	strays, err := Strays(context.Background(), m.run, known)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(strays) != 1 || strays[0].Name != "gitea-old" || !strings.Contains(strays[0].Detail, "gitea:1.22") {
+		t.Fatalf("strays: %+v", strays)
+	}
+}

internal/apply/hold.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"syscall"
 	"time"
@@ -433,6 +434,32 @@ type foundContainer struct {
 	id      string
 	running bool
 	spec    string
+	// What a take compares (novox/hq ADR 0163): the image and its id, the networks the container
+	// is on, its mounts and its published ports — empty from a runtime (or a test's fake) that
+	// answers the short form.
+	image    string
+	imageID  string
+	networks []string
+	mounts   []string
+	ports    []string
+}
+
+// foundFormat is what inspectFound asks the runtime for, tab-separated: the three a hold has
+// always needed, then the facts a take compares.
+const foundFormat = "{{.Id}}\t{{.State.Running}}\t{{index .Config.Labels \"" + specLabel + "\"}}" +
+	"\t{{.Config.Image}}\t{{.Image}}" +
+	"\t{{range $k, $v := .NetworkSettings.Networks}}{{$k}},{{end}}" +
+	"\t{{range .Mounts}}{{.Source}}:{{.Destination}},{{end}}" +
+	"\t{{range $p, $b := .NetworkSettings.Ports}}{{$p}}{{range $b}}>{{.HostIp}}:{{.HostPort}}{{end}},{{end}}"
+
+func splitList(s string) []string {
+	var out []string
+	for _, part := range strings.Split(s, ",") {
+		if part = strings.TrimSpace(part); part != "" {
+			out = append(out, part)
+		}
+	}
+	return out
 }
 
 // inspectFound reads a container by name the way a hold needs it: its id, whether it runs, and
@@ -451,8 +478,7 @@ func inspectFound(ctx context.Context, name string, run Runner) (foundContainer,
 	if err != nil {
 		return foundContainer{}, false, fmt.Errorf("%w, so nothing can be said about %q", err, name)
 	}
-	out, err := run(ctx, cri, "container", "inspect", "--format",
-		"{{.Id}}\t{{.State.Running}}\t{{index .Config.Labels \""+specLabel+"\"}}", name)
+	out, err := run(ctx, cri, "container", "inspect", "--format", foundFormat, name)
 	if err != nil {
 		if absent(err) {
 			return foundContainer{}, false, nil
@@ -466,14 +492,100 @@ func inspectFound(ctx context.Context, name string, run Runner) (foundContainer,
 			name, err)
 	}
 	parts := strings.Split(strings.TrimSpace(out), "\t")
-	for len(parts) < 3 {
+	for len(parts) < 8 {
 		parts = append(parts, "")
 	}
 	spec := strings.TrimSpace(parts[2])
 	if spec == "<no value>" {
 		spec = ""
 	}
-	return foundContainer{id: strings.TrimSpace(parts[0]), running: parts[1] == "true", spec: spec}, true, nil
+	return foundContainer{id: strings.TrimSpace(parts[0]), running: parts[1] == "true", spec: spec,
+		image: strings.TrimSpace(parts[3]), imageID: strings.TrimSpace(parts[4]),
+		networks: splitList(parts[5]), mounts: splitList(parts[6]), ports: splitList(parts[7])}, true, nil
+}
+
+// factsOf is what a take would compare for a found container (novox/hq ADR 0163): the found
+// image and when it was made, the networks and who else is on them, mounts and ports — beside
+// what the module declares, and the declared image's date when that image is on the machine.
+// Every question the runtime cannot answer leaves its fact empty; a preview says so rather than
+// guesses.
+func factsOf(ctx context.Context, seen foundContainer, res *declaration.Container, run Runner) *Facts {
+	cri, err := containerRuntime(ctx, run)
+	if err != nil {
+		return nil
+	}
+	f := &store.Facts{Image: seen.image, Mounts: seen.mounts, Ports: seen.ports,
+		DeclaredImage: res.Image, DeclaredPorts: res.Ports, DeclaredVolumes: res.Volumes}
+	if seen.imageID != "" {
+		if out, err := run(ctx, cri, "image", "inspect", "--format", "{{.Created}}", seen.imageID); err == nil {
+			f.ImageCreated = strings.TrimSpace(out)
+		}
+	}
+	if res.Image != "" {
+		if out, err := run(ctx, cri, "image", "inspect", "--format", "{{.Created}}", res.Image); err == nil {
+			f.DeclaredImageCreated = strings.TrimSpace(out)
+		}
+	}
+	if found, err := time.Parse(time.RFC3339Nano, f.ImageCreated); err == nil {
+		if declared, err := time.Parse(time.RFC3339Nano, f.DeclaredImageCreated); err == nil {
+			f.Downgrade = declared.Before(found)
+		}
+	}
+	for _, network := range seen.networks {
+		if f.Networks == nil {
+			f.Networks = map[string][]string{}
+		}
+		var members []string
+		if out, err := run(ctx, cri, "network", "inspect", "--format",
+			"{{range .Containers}}{{.Name}},{{end}}", network); err == nil {
+			for _, m := range splitList(out) {
+				if m != res.Name {
+					members = append(members, m)
+				}
+			}
+		}
+		sort.Strings(members)
+		f.Networks[network] = members
+	}
+	return (*Facts)(f)
+}
+
+// Facts is store.Facts, named here so hold's callers read as one vocabulary.
+type Facts = store.Facts
+
+// differenceOf is how a found file differs from the declared content: the lines only the found
+// file has, marked -, then the lines only the declared content has, marked +, in their own order,
+// bounded so a report stays a report. Not a diff tool's output: the question a take answers is
+// "what would be lost and what would be new", and that is these two lists.
+func differenceOf(found, declared string) (bool, []string) {
+	if found == declared {
+		return false, nil
+	}
+	const bound = 40
+	count := func(s string) map[string]int {
+		out := map[string]int{}
+		for _, line := range strings.Split(s, "\n") {
+			out[line]++
+		}
+		return out
+	}
+	inFound, inDeclared := count(found), count(declared)
+	var out []string
+	add := func(mark, s string, other map[string]int) {
+		seen := map[string]int{}
+		for _, line := range strings.Split(s, "\n") {
+			seen[line]++
+			if seen[line] > other[line] && len(out) < bound {
+				out = append(out, mark+" "+line)
+			}
+		}
+	}
+	add("-", found, inDeclared)
+	add("+", declared, inFound)
+	if len(out) >= bound {
+		out = append(out, "… and more")
+	}
+	return true, out
 }
 
 // absent is whether a runtime said the thing is not there, rather than failing to answer. Its own
@@ -540,6 +652,12 @@ func hold(ctx context.Context, sys system.System, r declaration.Resource, module
 			} else if digestOf(string(content)) != h.Digest {
 				changed = "rewritten"
 			}
+			// What a take would replace it with, and how that differs (novox/hq ADR 0163): a
+			// file declared whole is compared whole; one written into is not replaced at all.
+			if res.Into == "" {
+				differs, lines := differenceOf(string(content), res.Content)
+				h.Facts = &Facts{Differs: differs, Difference: lines}
+			}
 		}
 	case *declaration.Directory:
 		info, err := os.Lstat(res.Path)
@@ -628,6 +746,9 @@ func hold(ctx context.Context, sys system.System, r declaration.Resource, module
 		case h.Running && !seen.running:
 			changed = "stopped"
 		}
+		if exists {
+			h.Facts = factsOf(ctx, seen, res, run)
+		}
 	default:
 		return out, h, fmt.Errorf("a %s cannot be held", r.Kind())
 	}

internal/apply/hold_test.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
 	"testing"
 
@@ -18,7 +19,11 @@ import (
 // label when a host made it. Every command it is asked is written down.
 type machine struct {
 	containers map[string]*fakeContainer
-	asked      []string
+	// images is what `image inspect --format {{.Created}}` answers per image or id; members is
+	// what `network inspect` lists per network (ADR 0163).
+	images  map[string]string
+	members map[string][]string
+	asked   []string
 	// wgUp is what `wg show interfaces` answers: the tunnels up on the machine.
 	wgUp string
 	// handshakes is what `wg show <interface> latest-handshakes` answers, and handshakesFail the
@@ -97,6 +102,9 @@ type fakeContainer struct {
 	id      string
 	running bool
 	spec    string
+	// What a take compares (ADR 0163), answered in the long inspect form when set.
+	image, imageID          string
+	networks, mounts, ports []string
 }
 
 func (m *machine) run(_ context.Context, name string, args ...string) (string, error) {
@@ -140,9 +148,38 @@ func (m *machine) run(_ context.Context, name string, args ...string) (string, e
 			running = "true"
 		}
 		if strings.HasPrefix(args[3], "{{.Id}}") {
-			return c.id + "\t" + running + "\t" + c.spec + "\n", nil
+			line := c.id + "\t" + running + "\t" + c.spec
+			if c.image != "" {
+				line += "\t" + c.image + "\t" + c.imageID + "\t" + strings.Join(c.networks, ",") + "," +
+					"\t" + strings.Join(c.mounts, ",") + "," + "\t" + strings.Join(c.ports, ",") + ","
+			}
+			return line + "\n", nil
 		}
 		return running + "\t" + c.spec + "\n", nil
+	case "image":
+		if len(args) > 1 && args[1] == "inspect" {
+			if created, ok := m.images[args[len(args)-1]]; ok {
+				return created + "\n", nil
+			}
+			return "", errors.New("no such image")
+		}
+		return "", nil
+	case "network":
+		if len(args) > 1 && args[1] == "inspect" {
+			return strings.Join(m.members[args[len(args)-1]], ",") + ",\n", nil
+		}
+		return "", nil
+	case "ps":
+		var lines []string
+		for name, c := range m.containers {
+			state := "exited"
+			if c.running {
+				state = "running"
+			}
+			lines = append(lines, name+"\t"+c.image+"\t"+state)
+		}
+		sort.Strings(lines)
+		return strings.Join(lines, "\n") + "\n", nil
 	case "rm":
 		delete(m.containers, args[len(args)-1])
 		return "", nil

internal/apply/left_out_test.go

@@ -0,0 +1,136 @@
+package apply
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-host/internal/declaration"
+	"github.com/novox/mesh-host/internal/store"
+)
+
+// A taken container keeps a found network by a per-machine setting (novox/hq ADR 0163, rule 4):
+// joined once it runs, part of its spec, and refused when it cannot be joined.
+func TestAContainerJoinsTheNetworksItKeeps(t *testing.T) {
+	var ran []string
+	connectFails := false
+	run := func(_ context.Context, name string, args ...string) (string, error) {
+		if name != "docker" {
+			return "", errors.New("not installed")
+		}
+		ran = append(ran, strings.Join(args, " "))
+		switch args[0] {
+		case "info":
+			return "29.0.0\n", nil
+		case "container":
+			if len(ran) > 2 {
+				return "true\t" + specOfLast, nil
+			}
+			return "false\t\n", errors.New("no such container")
+		case "run":
+			return "deadbeef\n", nil
+		case "network":
+			if connectFails {
+				return "", errors.New("network predecessor_default not found")
+			}
+		}
+		return "", nil
+	}
+	d := parseTrusted(t, `{"declaration":1,"resources":[
+	  {"id":"app","type":"container","name":"app","image":"`+pinned+`",
+	   "networks":["predecessor_default"]}
+	]}`)
+	specOfLast = containerSpec(d.Resources[0].(*declaration.Container), inputs{})
+	alone := *d.Resources[0].(*declaration.Container)
+	alone.Networks = nil
+	if specOfLast == containerSpec(&alone, inputs{}) {
+		t.Fatal("the kept network is not part of the container's spec: kept or let go, the container would be left alone")
+	}
+	report, _, err := Apply(context.Background(), archHost(t), d, store.State{}, store.OriginCarried, run, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	joined := false
+	for i, line := range ran {
+		if line == "network connect predecessor_default app" {
+			joined = true
+			if ran[i-1] != "container inspect --format {{.State.Running}}\t{{index .Config.Labels \""+specLabel+"\"}} app" &&
+				!strings.HasPrefix(ran[i-1], "container inspect") {
+				t.Errorf("joined before the container was read back as running: %v", ran)
+			}
+		}
+	}
+	if !joined || report.Outcomes[0].Action != "created" {
+		t.Fatalf("the container did not join the kept network: %v\n%+v", ran, report.Outcomes)
+	}
+
+	connectFails, ran = true, nil
+	if _, _, err := Apply(context.Background(), archHost(t), d, store.State{}, store.OriginCarried, run, nil, nil); err == nil ||
+		!strings.Contains(err.Error(), "could not join the kept network predecessor_default") {
+		t.Fatalf("a network that cannot be joined was passed over: %v", err)
+	}
+}
+
+var specOfLast string
+
+// A module the mesh left out of a declaration is not a module the mesh removed (novox/hq ADR 0163,
+// rule 6): what the host wrote for it stays, recorded and said; what it holds for it stays held.
+// A module simply absent is removed as it always was.
+func TestALeftOutModuleIsNeitherRemovedNorForgotten(t *testing.T) {
+	var removed []string
+	gone := map[string]bool{}
+	run := func(_ context.Context, name string, args ...string) (string, error) {
+		if name != "docker" {
+			return "", nil
+		}
+		switch args[0] {
+		case "info":
+			return "29.0.0\n", nil
+		case "rm":
+			removed = append(removed, args[len(args)-1])
+			gone[args[len(args)-1]] = true
+		case "container":
+			if gone[args[len(args)-1]] {
+				return "", errors.New("no such container")
+			}
+			return "true\tspec", nil
+		}
+		return "", nil
+	}
+	known := store.State{
+		Resources: []store.Applied{
+			{ID: "web.server", Type: "container", Target: "web", Origin: store.OriginDeclared},
+			{ID: "old.server", Type: "container", Target: "old", Origin: store.OriginDeclared},
+		},
+		Held: []store.Held{{ID: "web.page", Module: "web", Kind: "file", Target: "/srv/web/index.html"}},
+	}
+	d := parse(t, `{"declaration":1,"left_out":["web"],"resources":[
+	  {"id":"notes.conf","type":"file","path":"`+t.TempDir()+`/notes.conf","content":"x"}
+	]}`)
+	report, state, err := Apply(context.Background(), archHost(t), d, known, store.OriginDeclared, run, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(removed) != 1 || removed[0] != "old" {
+		t.Fatalf("removed %v; only the module that is absent goes", removed)
+	}
+	if _, kept := state.At("container", "web"); !kept {
+		t.Fatal("the left-out module's record was forgotten")
+	}
+	if _, held := state.HeldAt("web.page"); !held {
+		t.Fatal("the left-out module's hold was released")
+	}
+	said := false
+	for _, o := range report.Outcomes {
+		if o.ID == "web.server" && o.Action == "unchanged" && strings.Contains(o.Detail, "web was left out of this declaration by the mesh") {
+			said = true
+		}
+		if o.ID == "web.server" && o.Action != "unchanged" {
+			t.Errorf("the left-out module's container was %s", o.Action)
+		}
+	}
+	if !said {
+		t.Fatalf("keeping the left-out module's container was not said: %+v", report.Outcomes)
+	}
+}

internal/apply/strays.go

@@ -0,0 +1,54 @@
+package apply
+
+import (
+	"context"
+	"sort"
+	"strings"
+
+	"github.com/novox/mesh-host/internal/declaration"
+	"github.com/novox/mesh-host/internal/store"
+)
+
+// Strays is what runs on the machine that the mesh neither wrote nor holds (novox/hq ADR 0163):
+// every container the runtime has that no record names and no hold names. The question nothing
+// answered on 2026-09-23, when a renamed resource left its old container running for a day; asked
+// on every apply now, and reported, so a thing left behind is seen the day it is left.
+//
+// Containers only, today. A listener nobody declared is harder to attribute to a thing, and the
+// machine's own services are not strays; that account is issue 160's.
+func Strays(ctx context.Context, run Runner, known store.State) ([]store.Stray, error) {
+	cri, err := containerRuntime(ctx, run)
+	if err != nil {
+		return nil, nil // a machine with no runtime has no containers to stray
+	}
+	out, err := run(ctx, cri, "ps", "-a", "--format", "{{.Names}}\t{{.Image}}\t{{.State}}")
+	if err != nil {
+		return nil, err
+	}
+	ours := map[string]bool{}
+	for _, r := range known.Resources {
+		if declaration.Type(r.Type) == declaration.TypeContainer {
+			ours[r.Target] = true
+		}
+	}
+	for _, h := range known.Held {
+		if h.Kind == string(declaration.TypeContainer) {
+			ours[h.Target] = true
+		}
+	}
+	var strays []store.Stray
+	for _, line := range strings.Split(strings.TrimSpace(out), "\n") {
+		parts := strings.Split(line, "\t")
+		name := strings.TrimSpace(parts[0])
+		if name == "" || ours[name] {
+			continue
+		}
+		detail := ""
+		if len(parts) > 2 {
+			detail = strings.TrimSpace(parts[1]) + ", " + strings.TrimSpace(parts[2])
+		}
+		strays = append(strays, store.Stray{Kind: string(declaration.TypeContainer), Name: name, Detail: detail})
+	}
+	sort.Slice(strays, func(i, j int) bool { return strays[i].Name < strays[j].Name })
+	return strays, nil
+}

internal/bootstrap/genesis_forge_test.go

@@ -0,0 +1,79 @@
+package bootstrap
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+// What genesis raises, it raises as the module that succeeds it declares — name, data directory
+// and image — so the module adopts it by the found rule that already exists (novox/hq ADR 0163,
+// rule 7; issue 090). The network is the one difference left: the bootstrap forge runs on the
+// machine's network to reach the store on its loopback, and a take says so.
+func TestGenesisRaisesTheForgeAsTheModuleDeclaresIt(t *testing.T) {
+	var ran [][]string
+	run := func(_ context.Context, name string, args ...string) (string, error) {
+		if name == "docker" && args[0] == "container" {
+			return "", nil // not raised yet
+		}
+		ran = append(ran, append([]string{name}, args...))
+		return "", nil
+	}
+	if err := raiseGiteaServer(context.Background(), run, time.Second, "pw", DefaultPorts(), quietly); err != nil {
+		t.Fatal(err)
+	}
+	var raised []string
+	for _, r := range ran {
+		if r[0] == "docker" && r[1] == "run" {
+			raised = r
+		}
+	}
+	line := strings.Join(raised, " ")
+	for _, want := range []string{"--name gitea ", "--volume " + giteaDataDir + ":/data", " " + giteaImage} {
+		if !strings.Contains(line+" ", want) {
+			t.Errorf("the forge is not raised with %q: %s", want, line)
+		}
+	}
+	if giteaBootstrap != ForgeModule {
+		t.Errorf("the bootstrap forge is %q and the module names its container %q", giteaBootstrap, ForgeModule)
+	}
+
+	// Against the module's own manifest, where the catalogue is checked out beside this repository.
+	var manifest []byte
+	for _, candidate := range []string{"../../../mesh-catalog/modules/gitea/module.json", "../../../../../mesh-catalog/modules/gitea/module.json"} {
+		if raw, err := os.ReadFile(filepath.Clean(candidate)); err == nil {
+			manifest = raw
+			break
+		}
+	}
+	if manifest == nil {
+		t.Skip("the catalogue is not beside this checkout; the module's pin is not compared")
+	}
+	var m struct {
+		Resources []struct {
+			ID, Type, Name, Image string
+			Volumes               []string
+		} `json:"resources"`
+	}
+	if err := json.Unmarshal(manifest, &m); err != nil {
+		t.Fatal(err)
+	}
+	for _, r := range m.Resources {
+		if r.Type != "container" || r.ID != "server" {
+			continue
+		}
+		if r.Name != giteaBootstrap {
+			t.Errorf("the module names its container %q; genesis raises %q", r.Name, giteaBootstrap)
+		}
+		if r.Image != giteaImage {
+			t.Errorf("the module pins %s; genesis raises %s — the two must move together", r.Image, giteaImage)
+		}
+		if len(r.Volumes) != 1 || !strings.HasSuffix(r.Volumes[0], ":/data") {
+			t.Errorf("the module mounts %v; genesis mounts %s:/data", r.Volumes, giteaDataDir)
+		}
+	}
+}

internal/bootstrap/inuse_test.go

@@ -91,7 +91,7 @@ func TestARerunOfGenesisIsNotAMachineInUse(t *testing.T) {
 	if err := store.Save(o.State, store.State{Resources: []store.Applied{{ID: "store", Type: "container", Target: "mesh-store"}}}); err != nil {
 		t.Fatal(err)
 	}
-	m := inUseRunner{ps: "mesh-gitea-server\t\n", ss: servingSockets}
+	m := inUseRunner{ps: giteaBootstrap + "\t\n", ss: servingSockets}
 	if err := RefuseAMachineInUse(context.Background(), o, m.run, quietly); err != nil {
 		t.Errorf("what an earlier genesis raised was counted as a machine in use: %v", err)
 	}

internal/bootstrap/phase_packages.go

@@ -25,11 +25,24 @@ const (
 	// foundationStore is the foundation's postgres container — the mesh's own memory, raised from the
 	// bundle. gitea's bootstrap database lives here too, so a mesh runs one postgres (issue 051).
 	foundationStore = "mesh-store"
-	// giteaBootstrap is the gitea server raised directly at genesis, before gitea is a module.
-	giteaBootstrap = "mesh-gitea-server"
-	// giteaImage is the same upstream image the gitea module runs, pinned identically so the module
-	// adopts the running server rather than replacing it.
-	giteaImage = "gitea/gitea@sha256:dfc61e347c8b582df918f4556401bf2cecdfbdb56c5282ae9488dd76fca3e41c"
+	// giteaBootstrap is the gitea server raised directly at genesis, before gitea is a module —
+	// under the name the gitea MODULE declares for its container, so the module finds it and holds
+	// it rather than raising a second forge beside it (novox/hq ADR 0163, rule 7; issue 090).
+	giteaBootstrap = "gitea"
+	// giteaImage is the image the gitea module declares for that container, pinned to the same
+	// digest, so taking the module over is not a downgrade and not an upgrade. **Moves with the
+	// module's pin**: the two are compared by a take, and a difference is said there — but a
+	// genesis that raised an older image than the module declares would be taken over as an
+	// upgrade on first push, which a forge holding the mesh's packages must not have done to it
+	// unannounced. Checked in TestGenesisRaisesTheForgeAsTheModuleDeclaresIt against the module's
+	// manifest where the catalogue is beside this checkout.
+	giteaImage = "gitea/gitea@sha256:87a67ee09d3ae0d1df5fda5dcda3e2a1f9236a45b0a59025d6e00e46adc43bef"
+	// giteaDataDir is where the module's `data` directory resolves on a machine with the default
+	// layout (<data root>/<module>/<id>, novox/hq ADR 0112): mounted at /data as the module mounts
+	// it, so the repositories, attachments and indexes the bootstrap forge accumulates are the
+	// module's the day it is taken — before this, the forge had no volume and its data was the
+	// container's, lost with it.
+	giteaDataDir = "/var/lib/gitea/data"
 	// packagesOrg is the npm owner: every module consumes `@novox/*` from this gitea org.
 	packagesOrg = "novox"
 	// packagesTeam is the org team whose members may read and write the org's packages.
@@ -262,9 +275,13 @@ func raiseGiteaServer(ctx context.Context, run Runner, timeout time.Duration, db
 		"run", "-d", "--name", giteaBootstrap,
 		// Host network, like the control plane: it reaches the foundation store on the machine's
 		// loopback (where the store publishes 5432) and answers on the machine's own 3000, which is
-		// where mesh-bootstrap and the builder's build containers look for it.
+		// where mesh-bootstrap and the builder's build containers look for it. The module runs
+		// bridged and publishes its ports; that is the one difference a take still has to say
+		// (ADR 0163, rule 7) — the data, the name and the image are the module's already.
 		"--network", "host",
 		"--restart", "unless-stopped",
+		// The module's data directory, so what the forge accumulates is the module's when taken.
+		"--volume", giteaDataDir + ":/data",
 	}, env...)
 	args = append(args, giteaImage)
 

internal/declaration/declaration.go

@@ -940,6 +940,13 @@ type Container struct {
 	// its siblings can name before any of them can resolve anything.
 	Dns []string `json:"dns,omitempty"`
 
+	// Networks are networks this container also joins once created, by name — a found network a
+	// per-machine setting keeps for a taken container (novox/hq ADR 0163, rule 4), so a
+	// neighbour that resolves it there keeps resolving it until the neighbour is taken too.
+	// Joined after creation, because a runtime starts a container on one network; part of the
+	// container's spec, so a network kept or let go recreates it.
+	Networks []string `json:"networks,omitempty"`
+
 	// IP is this container's address on its network, passed to the runtime unchanged.
 	//
 	// Only meaningful on a user-defined network, and refused by the runtime elsewhere. Exists for
@@ -1032,6 +1039,16 @@ func (c *Container) validate(where string, _ bool) []string {
 				"static address anywhere but a user-defined one")
 		}
 	}
+	for _, n := range c.Networks {
+		problems = append(problems, (&Network{Name: n}).validate(where+": networks", false)...)
+		if n == c.Network {
+			problems = append(problems, where+": networks names "+n+", which is already the container's network")
+		}
+	}
+	if len(c.Networks) > 0 && (c.RunOnce || c.Schedule != "") {
+		problems = append(problems, where+": networks is for a container that keeps running; a step "+
+			"runs and exits, and joins nothing afterwards")
+	}
 	return append(problems, checkImage(where, c.Image)...)
 }
 
@@ -1137,6 +1154,41 @@ type Declaration struct {
 	// converged node — which is every node the mesh raised before adoption existed, and so the
 	// only form an older controller ever sends (novox/hq ADR 0100).
 	Adoption *Adoption
+
+	// Sequence orders this declaration against every other the mesh has sent this node: each
+	// send is one higher than the last, assigned under the control plane's hold on the node
+	// (novox/hq 04-ISSUES/107). Zero is a declaration that carries no order — every one an older
+	// controller sent, and the bundle genesis applies — and a host makes no ordering claim about
+	// one of those.
+	//
+	// **The one property a declaration needs that its signature does not give it.** A signature
+	// says the mesh sent this; it cannot say the mesh sent it AFTER the one the host is holding.
+	// Before this, "older" was inferred from arrival within a batch and a 750ms window, and a
+	// backlog longer than the batch, or a slow broker, applied a declaration the mesh had already
+	// superseded.
+	Sequence int64
+
+	// LeftOut names the modules of this machine's set the mesh left out of this declaration,
+	// because a setting stored for one cannot compose with its definition (novox/hq ADR 0163,
+	// rule 6). A machine is told everything or nothing about what it IS told; this is what it is
+	// not told, said. The host keeps what it holds for a left-out module and touches none of
+	// what it wrote for it — its resources are absent from the declaration, and absence would
+	// otherwise read as removal.
+	LeftOut []string
+}
+
+// LeftOutModuleOf says which left-out module a recorded resource belongs to, if any: its id is the
+// module's name, a dot, and the module's own id for it. A module's name may contain a dot, so the
+// longest left-out name that prefixes the id wins; a false match keeps a thing an apply would
+// otherwise remove, which is the conservative mistake.
+func (d *Declaration) LeftOutModuleOf(id string) (string, bool) {
+	best := ""
+	for _, m := range d.LeftOut {
+		if strings.HasPrefix(id, m+".") && len(m) > len(best) {
+			best = m
+		}
+	}
+	return best, best != ""
 }
 
 // Adoption is a node's mode, as the controller records it: the node is adopted, and these are
@@ -1274,6 +1326,11 @@ type envelope struct {
 	// a bug quietly strip a machine.
 	OwnsNothing bool              `json:"owns_nothing,omitempty"`
 	Resources   []json.RawMessage `json:"resources"`
+	// Sequence is optional on the wire, so a controller that does not send one is still
+	// understood: absent reads as zero, which is "no ordering claimed" rather than "first".
+	Sequence int64 `json:"sequence,omitempty"`
+	// LeftOut is optional on the wire too, and absent when nothing was left out (ADR 0163).
+	LeftOut []string `json:"left_out,omitempty"`
 }
 
 func parse(raw []byte, allowActions bool) (*Declaration, error) {
@@ -1290,8 +1347,20 @@ func parse(raw []byte, allowActions bool) (*Declaration, error) {
 			env.Version, Version)}}
 	}
 
-	d := &Declaration{Version: env.Version, For: env.For, Adoption: env.Adoption}
+	d := &Declaration{Version: env.Version, For: env.For, Adoption: env.Adoption, Sequence: env.Sequence,
+		LeftOut: env.LeftOut}
 	var problems []string
+	if len(env.LeftOut) > 0 && allowActions {
+		// The bundle is carried with the binary and leaves nothing out: which module a setting
+		// stopped composing for is the mesh's record (ADR 0163).
+		problems = append(problems, "a carried bundle says modules were left out, and only the "+
+			"mesh can say that")
+	}
+	for _, m := range env.LeftOut {
+		if strings.TrimSpace(m) == "" {
+			problems = append(problems, "left_out names a module with no name")
+		}
+	}
 
 	if len(env.Resources) == 0 && !env.OwnsNothing {
 		problems = append(problems, "no resources. An empty declaration is a mistake, not a "+

internal/declaration/declaration_test.go

@@ -464,3 +464,43 @@ func TestAnExplicitlyEmptyDeclarationIsAccepted(t *testing.T) {
 		t.Fatalf("an unmarked empty declaration must still be refused; got %v", err)
 	}
 }
+
+// A container's kept networks are names, not its own network, and not for a step (novox/hq ADR
+// 0163, rule 4); and the mesh may say which modules it left out, which a carried bundle may not.
+func TestKeptNetworksAndLeftOutModulesAreReadStrictly(t *testing.T) {
+	pinnedImage := "postgres@sha256:" + strings.Repeat("a", 64)
+	d, err := Parse([]byte(`{"declaration":1,"left_out":["web"],"resources":[
+	  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `","networks":["predecessor_default"]}
+	]}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := d.Resources[0].(*Container).Networks; len(got) != 1 || got[0] != "predecessor_default" {
+		t.Fatalf("the kept network was not read: %v", got)
+	}
+	if m, left := d.LeftOutModuleOf("web.server"); !left || m != "web" {
+		t.Fatalf("web.server is not web's: %q %v", m, left)
+	}
+	if _, left := d.LeftOutModuleOf("webapp.server"); left {
+		t.Fatal("webapp.server was taken for web's")
+	}
+	for name, raw := range map[string]string{
+		"a bad network name": `{"declaration":1,"resources":[
+		  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `","networks":["a/b"]}]}`,
+		"its own network": `{"declaration":1,"resources":[
+		  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `","network":"own","networks":["own"]}]}`,
+		"a step": `{"declaration":1,"resources":[
+		  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `","run-once":true,"networks":["x"]}]}`,
+		"a nameless module": `{"declaration":1,"left_out":[""],"resources":[
+		  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `"}]}`,
+	} {
+		if _, err := Parse([]byte(raw)); err == nil {
+			t.Errorf("%s was accepted", name)
+		}
+	}
+	if _, err := ParseTrusted([]byte(`{"declaration":1,"left_out":["web"],"resources":[
+	  {"id":"app","type":"container","name":"app","image":"` + pinnedImage + `"}]}`)); err == nil ||
+		!strings.Contains(err.Error(), "only the mesh can say that") {
+		t.Fatalf("a carried bundle leaving modules out was accepted: %v", err)
+	}
+}

internal/link/asking_nats.go

@@ -3,6 +3,7 @@ package link
 import (
 	"context"
 	"crypto/rand"
+	"crypto/sha256"
 	"encoding/hex"
 	"errors"
 	"fmt"
@@ -63,8 +64,15 @@ func presentNats(_ context.Context, to Approach, node, secret string,
 	// subscribe its own inbox and nothing else (design 25 §6). The secret is its password, the same
 	// string the request claims, so the server proves somebody holds the token and the request
 	// proves the same thing to the controller without it having to ask the server who connected.
+	// **Its own inbox space, because that is the only one it may listen in** (novox/hq
+	// 04-ISSUES/146). A JetStream publish waits for the stream's acknowledgement on an inbox the
+	// client picks, and the client's default is `_INBOX.<random>` — which this user may not
+	// subscribe to, so the enrolment failed with a permissions violation on a subject nobody had
+	// chosen. The permission is `_INBOX.enrol.<node>.>` (design 25 §6), so the client is told to
+	// pick its inboxes there; the reply address below is in the same space for the same reason.
 	conn, err := nats.Connect(natsURL(to.Address),
 		nats.Secure(config),
+		nats.CustomInboxPrefix("_INBOX.enrol."+node),
 		nats.UserInfo("enrol."+node, secret),
 		nats.Name("mesh-host/enrol/"+node),
 		nats.Timeout(timeout),
@@ -124,7 +132,19 @@ func (a *natsAsking) Ask(ctx context.Context, request []byte, wait time.Duration
 	defer cancel()
 	// Into the stream and awaited: an enrolment the bus never accepted must fail here rather than be
 	// assumed, because the node has nothing else to go on.
-	if _, err := a.js.Publish(EnrolSubject, addressed, nats.Context(publish)); err != nil {
+	//
+	// **Once, however many times it is sent** (novox/hq 04-ISSUES/146). The client re-publishes when
+	// an acknowledgement is slow, and the mesh enrolled the machine on each copy — minting a second
+	// credential, which replaced the first, which is the one the node had already been given. The
+	// machine then reconnected for ever as a user whose password the mesh had rotated out from under
+	// it, and the controller's log said "enrolled anchor" twice in the same second.
+	//
+	// The id is the message: the same bytes carry the same id, so the stream discards the client's
+	// own retry, and a genuine second attempt — which carries a new reply address — is a different
+	// message and is let through.
+	sum := sha256.Sum256(addressed)
+	if _, err := a.js.Publish(EnrolSubject, addressed,
+		nats.MsgId(hex.EncodeToString(sum[:])), nats.Context(publish)); err != nil {
 		return nil, fmt.Errorf("cannot ask the mesh to enrol this node: %w", err)
 	}
 

internal/link/messages.go

@@ -110,6 +110,15 @@ type Report struct {
 	// and the mesh's up in its place, and where the found configuration's original was kept.
 	Tunnel *CarriedTunnel `json:"tunnel,omitempty"`
 
+	// Strays is what runs on the machine that the mesh neither wrote nor holds (novox/hq ADR
+	// 0163): containers nobody declared and nobody holds, the ones a cutover leaves behind.
+	Strays []Stray `json:"strays,omitempty"`
+
+	// Profile is what this machine can do, detected again by the apply that reports (novox/hq
+	// ADR 0161) — the same shape enrolment sends — so a capability gained or lost since enrolment,
+	// a network manager switched, reaches the mesh at the next push rather than never.
+	Profile map[string]any `json:"profile,omitempty"`
+
 	// Host is the version of the host that produced this report (novox/hq ADR 0141).
 	//
 	// Without it nothing can say a machine is behind, so "every machine current with its source"
@@ -200,6 +209,16 @@ type Held struct {
 	Changed string `json:"changed,omitempty"`
 	// Kept is where a file's original was kept.
 	Kept string `json:"kept,omitempty"`
+	// Facts is the found thing beside what the module declares — what a take compares (novox/hq
+	// ADR 0163). The same shape the host keeps; the controller reads it as data.
+	Facts map[string]any `json:"facts,omitempty"`
+}
+
+// A Stray is a container the mesh neither wrote nor holds (ADR 0163).
+type Stray struct {
+	Kind   string `json:"kind"`
+	Name   string `json:"name"`
+	Detail string `json:"detail,omitempty"`
 }
 
 // Reach is one thing reachable on the machine: a listening socket, or a published container port.

internal/link/order_test.go

@@ -0,0 +1,50 @@
+package link
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+// The drain picked the last to arrive. A backlog longer than the batch, or a broker that split a
+// burst, delivered a superseded declaration last (novox/hq 04-ISSUES/107).
+
+func sequenced(t *testing.T, n int64) *said {
+	t.Helper()
+	inner, err := json.Marshal(map[string]any{"declaration": 1, "resources": []any{}, "sequence": n})
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, err := json.Marshal(Signed{Declaration: inner, Signature: []byte("s")})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return &said{body: body}
+}
+
+func TestTheDrainKeepsTheHighestSequenceNotTheLastToArrive(t *testing.T) {
+	waiting := make(chan Declaration, 8)
+	waiting <- sequenced(t, 9)
+	waiting <- sequenced(t, 4) // arrived last, composed earlier
+	latest, aside := newest(waiting, sequenced(t, 8), 30*time.Millisecond)
+	if got := sequenceOf(latest.Body()); got != 9 {
+		t.Fatalf("the drain kept sequence %d, and 9 was waiting", got)
+	}
+	if len(aside) != 2 {
+		t.Fatalf("%d set aside, wanted 2 (the 8 and the late 4)", len(aside))
+	}
+}
+
+func TestWithoutSequencesTheLastToArriveStillWins(t *testing.T) {
+	// The behaviour this had before, kept for a controller that sends no order.
+	apply, aside := newest(arriving("two", "three"), &said{body: []byte("one")}, 30*time.Millisecond)
+	if string(apply.Body()) != "three" || len(aside) != 2 {
+		t.Fatalf("applied %q with %d set aside", apply.Body(), len(aside))
+	}
+}
+
+func TestAnUnreadableBodyClaimsNoOrder(t *testing.T) {
+	if got := sequenceOf([]byte("not json")); got != 0 {
+		t.Fatalf("garbage claimed sequence %d", got)
+	}
+}

internal/link/run.go

@@ -300,6 +300,16 @@ func newest(arriving <-chan Declaration, first Declaration, window time.Duration
 			if !ok {
 				return latest, superseded
 			}
+			// **By sequence when both carry one, by arrival when either does not** (novox/hq
+			// 04-ISSUES/107). Arrival is what this window had to go on, and it is wrong exactly
+			// when it matters — a backlog drained out of order. A declaration that says where it
+			// stands is believed over when it turned up; one that does not is the older
+			// controller's, and arrival is all there is.
+			if sequenceOf(next.Body()) < sequenceOf(latest.Body()) &&
+				sequenceOf(next.Body()) > 0 && sequenceOf(latest.Body()) > 0 {
+				superseded = append(superseded, next)
+				continue
+			}
 			superseded = append(superseded, latest)
 			latest = next
 		case <-time.After(window):
@@ -308,6 +318,24 @@ func newest(arriving <-chan Declaration, first Declaration, window time.Duration
 	}
 }
 
+// sequenceOf is the order a signed declaration claims, or zero when it claims none or cannot be
+// read. Read from the envelope alone; the signature is verified later, when the winner is applied,
+// and a forged message that lied about its sequence would only set aside real ones — which are
+// reported as set aside, and the next push sends the current one again.
+func sequenceOf(body []byte) int64 {
+	var signed Signed
+	if err := json.Unmarshal(body, &signed); err != nil {
+		return 0
+	}
+	var d struct {
+		Sequence int64 `json:"sequence"`
+	}
+	if err := json.Unmarshal(signed.Declaration, &d); err != nil {
+		return 0
+	}
+	return d.Sequence
+}
+
 // declaredIn is the id a signed declaration carries, for a report about one that was not applied.
 // Empty if the message is not one — a forged or garbled message is refused by handleBody when its
 // turn comes; here it is only named.

internal/profile/detectors.go

@@ -20,6 +20,14 @@ const (
 	// state: whether one IS running. Assignment needs the first.
 	CapSeat       = "seat"
 	CapPrivileged = "privileged"
+
+	// The network manager this machine runs, one capability per dialect (novox/hq ADR 0161): the
+	// uplink seat's holder declares its own, so the holder for a manager the machine does not run
+	// is refused the way any missing capability is, naming it. Active, not installed — a machine
+	// may have two of these on disk and runs one.
+	CapUplinkNetworkManager  = "uplink-networkmanager"
+	CapUplinkSystemdNetworkd = "uplink-systemd-networkd"
+	CapUplinkDhcpcd          = "uplink-dhcpcd"
 )
 
 // commandCapability is the shape most detectors take: run something, and treat a working
@@ -202,6 +210,21 @@ func Default(runner Runner) []Detector {
 			why:    "asks the kernel for interfaces — needs the module, not just the tool",
 			runner: runner,
 		},
+		commandCapability{
+			name: CapUplinkNetworkManager, command: "systemctl", args: []string{"is-active", "NetworkManager.service"},
+			why:    "asks the init whether NetworkManager is running — the dialect the uplink seat's holder must speak",
+			runner: runner,
+		},
+		commandCapability{
+			name: CapUplinkSystemdNetworkd, command: "systemctl", args: []string{"is-active", "systemd-networkd.service"},
+			why:    "asks the init whether systemd-networkd is running — the dialect the uplink seat's holder must speak",
+			runner: runner,
+		},
+		commandCapability{
+			name: CapUplinkDhcpcd, command: "systemctl", args: []string{"is-active", "dhcpcd.service"},
+			why:    "asks the init whether dhcpcd is running — the dialect the uplink seat's holder must speak",
+			runner: runner,
+		},
 	}
 }
 

internal/profile/uplink_test.go

@@ -0,0 +1,39 @@
+package profile
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+// The uplink seat's holder must be the dialect the machine runs (novox/hq ADR 0161): the profile
+// names the network manager found active, one capability per manager, and nothing for one that is
+// merely installed.
+func TestTheProfileNamesTheNetworkManagerThatIsRunning(t *testing.T) {
+	runner := func(_ context.Context, name string, args ...string) (string, error) {
+		if name == "systemctl" && len(args) == 2 && args[0] == "is-active" {
+			if args[1] == "NetworkManager.service" {
+				return "active\n", nil
+			}
+			return "inactive\n", errors.New("exit status 3")
+		}
+		return "", errors.New("not here")
+	}
+	var have []Detector
+	for _, d := range Default(Runner(runner)) {
+		switch d.Name() {
+		case CapUplinkNetworkManager, CapUplinkSystemdNetworkd, CapUplinkDhcpcd:
+			have = append(have, d)
+		}
+	}
+	if len(have) != 3 {
+		t.Fatalf("expected a detector per manager, found %d", len(have))
+	}
+	for _, d := range have {
+		v := d.Detect(context.Background())
+		want := d.Name() == CapUplinkNetworkManager
+		if v.Present != want {
+			t.Errorf("%s: present=%v, want %v (%s)", d.Name(), v.Present, want, v.Detail)
+		}
+	}
+}

internal/store/former_test.go

@@ -0,0 +1,29 @@
+package store
+
+import "testing"
+
+// A resource whose target moves leaves what the host wrote under the old target on record as a
+// former one, undeclared by construction, so the next apply removes it (novox/hq issue 097, ADR 0163).
+func TestARecordWhoseTargetMovedKeepsTheFormerTargetToRemove(t *testing.T) {
+	s := State{}
+	s.Record(Applied{ID: "gitea.server", Type: "container", Target: "mesh-gitea", Origin: OriginDeclared})
+	s.Record(Applied{ID: "gitea.server", Type: "container", Target: "gitea", Origin: OriginDeclared})
+	if len(s.Resources) != 2 {
+		t.Fatalf("a moved target produced %d record(s): %+v", len(s.Resources), s.Resources)
+	}
+	orphans := s.Orphans(map[string]bool{"gitea.server": true}, OriginDeclared)
+	if len(orphans) != 1 || orphans[0].Target != "mesh-gitea" || !IsFormer(orphans[0].ID) {
+		t.Fatalf("the former target is not an orphan to remove: %+v", orphans)
+	}
+	s.Forget(orphans[0].ID)
+	if len(s.Resources) != 1 || s.Resources[0].Target != "gitea" {
+		t.Fatalf("forgetting the former target touched the current one: %+v", s.Resources)
+	}
+	// The same target again is not a move; a carried record is not the host's to remove.
+	s.Record(Applied{ID: "gitea.server", Type: "container", Target: "gitea", Origin: OriginDeclared})
+	s.Record(Applied{ID: "bundle", Type: "file", Target: "/a"})
+	s.Record(Applied{ID: "bundle", Type: "file", Target: "/b"})
+	if len(s.Resources) != 2 {
+		t.Fatalf("an unmoved or carried record grew the list: %+v", s.Resources)
+	}
+}

internal/store/store.go

@@ -18,6 +18,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strings"
 	"time"
 )
 
@@ -274,6 +275,41 @@ type Held struct {
 	// reverted: that is how a predecessor still writing is caught.
 	Changed   string    `json:"changed,omitempty"`
 	ChangedAt time.Time `json:"changed_at,omitempty"`
+	// Facts is what a take would compare: the found thing beside what the module declares
+	// (novox/hq ADR 0163). Read fresh on every apply while held, so the controller's preview
+	// speaks of the machine as it is.
+	Facts *Facts `json:"facts,omitempty"`
+}
+
+// Facts is a held thing beside what its module declares — what a take compares (ADR 0163).
+type Facts struct {
+	// A found container: the image it runs and when that image was made; the networks it is on
+	// and the other containers on each; what it mounts; what it publishes.
+	Image        string              `json:"image,omitempty"`
+	ImageCreated string              `json:"image_created,omitempty"`
+	Networks     map[string][]string `json:"networks,omitempty"`
+	Mounts       []string            `json:"mounts,omitempty"`
+	Ports        []string            `json:"ports,omitempty"`
+	// What the module declares for it, and the declared image's creation date when the image
+	// is on the machine already.
+	DeclaredImage        string   `json:"declared_image,omitempty"`
+	DeclaredImageCreated string   `json:"declared_image_created,omitempty"`
+	DeclaredPorts        []string `json:"declared_ports,omitempty"`
+	DeclaredVolumes      []string `json:"declared_volumes,omitempty"`
+	// Downgrade is true when both creation dates are known and the declared image is the older.
+	Downgrade bool `json:"downgrade,omitempty"`
+	// A found file: whether the declared content differs from what was found, and how, as lines
+	// only in the found file (-) and lines only in the declared one (+), bounded.
+	Differs    bool     `json:"differs,omitempty"`
+	Difference []string `json:"difference,omitempty"`
+}
+
+// A Stray is something running on the machine that the mesh neither wrote nor holds
+// (novox/hq ADR 0163): the answer to "what is here that nobody asked for".
+type Stray struct {
+	Kind   string `json:"kind"`
+	Name   string `json:"name"`
+	Detail string `json:"detail,omitempty"`
 }
 
 // Recorded reports whether this host has a record, of any origin, of putting something of this
@@ -462,6 +498,20 @@ func Save(path string, s State) error {
 func (s *State) Record(a Applied) {
 	for i, existing := range s.Resources {
 		if existing.ID == a.ID {
+			// A resource whose target moved leaves what the host wrote under the old target
+			// behind — a container under the old name, a file at the old path. Rewriting the
+			// record would erase the only trace of it (novox/hq issue 097, ADR 0163), so the old
+			// target stays on record as a former one, undeclared by construction, until the next
+			// apply removes it the way it removes anything the host wrote and no longer declares.
+			// What was found is held, never recorded here, and so never removed by this.
+			if originOf(existing) == OriginDeclared && existing.Target != "" && a.Target != "" &&
+				existing.Target != a.Target && existing.Type == a.Type {
+				former := existing
+				former.ID = FormerID(existing.ID, existing.Target)
+				s.Resources[i] = a
+				s.Resources = append(s.Resources, former)
+				return
+			}
 			s.Resources[i] = a
 			return
 		}
@@ -469,6 +519,13 @@ func (s *State) Record(a Applied) {
 	s.Resources = append(s.Resources, a)
 }
 
+// FormerID names the record of a resource's former target: the resource's id and the target it
+// had, so the record is distinct from the current one and is never what a declaration names.
+func FormerID(id, target string) string { return id + "@former:" + target }
+
+// IsFormer says whether a record names a former target.
+func IsFormer(id string) bool { return strings.Contains(id, "@former:") }
+
 // Forget drops a resource from what the node owns.
 func (s *State) Forget(id string) {
 	kept := s.Resources[:0]