Vault: take and hash a process's own bus account (broker-<process id>) as a covered account, so take-over is not held by every process user

The controller hands each process account of a core or moved module with origin issued (ADR 0436 §2); the vault took
only broker and provisioner-broker, refused these and never hashed them. Owed hashes are now said once per pass, and
account_hash says who asked when it refuses too (review round 1).

Issue: 1945

.gitignore

@@ -29,3 +29,8 @@ modules/mesh-build-go/cmd/mesh-build-go/mesh-build-go
 modules/mesh-config/mesh-config
 modules/mesh-build-image/cmd/mesh-build-image/mesh-build-image
 *.test
+
+# binaries a local go build leaves in a module root
+/checks/paths/paths
+/modules/mesh-build-go/mesh-build-go
+/modules/mesh-delivery-gate/mesh-delivery-gate

checks/agenthome/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/config/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/deps/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/health/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/imagebuild/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/imageplace/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/locks/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/mailstore/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/noscripts/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/owned/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/particulars/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/paths/main.go

@@ -251,7 +251,8 @@ func main() {
 	}
 	var grown []string
 	if baseDir == "" {
-		fmt.Println("NOT COMPARED: no base branch's lists were given, so additions to them were not judged")
+		fmt.Fprintln(os.Stderr, "NOT COMPARED: no base branch's lists were given (-base <dir>), so additions to them were not judged; that is a failure, not a pass (issue 1295)")
+		os.Exit(2)
 	} else {
 		baseShared, _, err1 := list(filepath.Join(baseDir, "shared"))
 		baseKnown, _, err2 := list(filepath.Join(baseDir, "known"))

checks/paths/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/paths/realtree_test.go

@@ -32,8 +32,8 @@ func TestNoModuleNamesAnothersState(t *testing.T) {
 	}
 }
 
-// And neither list gains a line the trunk's copies at the merge base do not hold, unless the line says why after `# allow:`. Skipped,
-// and said, where no trunk is beside.
+// And neither list gains a line the trunk's copies at the merge base do not hold, unless the line says why after `# allow:`. Fails, saying
+// NOT COMPARED, where no trunk is beside (issue 1295).
 func TestTheListsOfPathsHoldNoLineTheTrunksDoNot(t *testing.T) {
 	sharedPath, okShared := trunk.Copy(t, "checks/paths/shared")
 	knownPath, okKnown := trunk.Copy(t, "checks/paths/known")

checks/predefined/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/secrets/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/sshdir/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/templates/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/toolchains/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/trunk/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

checks/trunk/trunk.go

@@ -3,14 +3,14 @@
 //
 // The checker fetches the change's own repository at its base commit beside the change, as it fetches a sibling, and says where
 // in MESH_CHECK_BESIDE; the copy is under the repository's name (the same convention the other repositories' tests use). With
-// MESH_CHECK_BESIDE unset, or set without the catalogue's copy in it, the comparison is skipped and the test says NOT COMPARED
-// WITH THE TRUNK, naming why: the checker that runs before R4g's delivery places siblings but not the change's own repository,
-// so R4g's own check cannot hold the copy (issue 1295 notes that a missing copy becomes a failure once that checker is gone). A trunk that holds no such file had
+// MESH_CHECK_BESIDE unset, or set without the catalogue's copy in it, the test fails saying NOT COMPARED WITH THE TRUNK and
+// why: the checker places the change's own repository since R4g (issue 1295), so a missing copy is a fault, never a pass. A trunk that holds no such file had
 // none: the list's first copy, which nothing was added to.
 package trunk
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
@@ -23,13 +23,11 @@ const Repository = "mesh-catalog"
 const BesideEnv = "MESH_CHECK_BESIDE"
 
 // Copy is the trunk's copy of the file at rel (a path from the catalogue's root), written to a file of the test's own: its path,
-// and whether the trunk holds one (false: its first copy). It skips the test, saying so, when no copy of the catalogue is beside.
+// and whether the trunk holds one (false: its first copy). It fails the test when no copy of the catalogue is beside.
 func Copy(t testing.TB, rel string) (string, bool) {
 	t.Helper()
-	raw, found, skip, err := Read(rel)
+	raw, found, err := Read(rel)
 	switch {
-	case skip != "":
-		t.Skip(skip)
 	case err != nil:
 		t.Fatal(err)
 	case !found:
@@ -43,27 +41,25 @@ func Copy(t testing.TB, rel string) (string, bool) {
 	return path, true
 }
 
-// Read is the trunk's copy of rel and whether the trunk holds one. skip is the words to skip the comparison with, when no trunk is
-// named; err is a trunk named and not there, or unreadable.
-func Read(rel string) (content []byte, found bool, skip string, err error) {
+// Read is the trunk's copy of rel and whether the trunk holds one. err is a trunk not beside the check (MESH_CHECK_BESIDE unset,
+// or without the catalogue's directory), or a copy unreadable: a comparison that cannot be made is never a pass.
+func Read(rel string) (content []byte, found bool, err error) {
 	beside := os.Getenv(BesideEnv)
 	if beside == "" {
-		return nil, false, "NOT COMPARED WITH THE TRUNK: " + BesideEnv + " is not set, so the trunk's copy of " + rel +
-			" is not beside this run; the checker places it", nil
+		return nil, false, fmt.Errorf("NOT COMPARED WITH THE TRUNK: %s is not set, so the trunk's copy of %s is not beside this run; the checker places the change's own repository there (issue 1295)", BesideEnv, rel)
 	}
 	dir := filepath.Join(beside, Repository)
 	if _, err := os.Stat(dir); errors.Is(err, os.ErrNotExist) {
-		return nil, false, "NOT COMPARED WITH THE TRUNK: " + Repository + " is not beside this check in " + BesideEnv + "=" + beside +
-			", so " + rel + " is not judged against the trunk's copy (the checker before R4g places no copy of the change's own repository)", nil
+		return nil, false, fmt.Errorf("NOT COMPARED WITH THE TRUNK: %s is not beside this check in %s=%s, so %s is not judged against the trunk's copy; the checker places the change's own repository there at its trunk (issue 1295)", Repository, BesideEnv, beside, rel)
 	} else if err != nil {
-		return nil, false, "", err
+		return nil, false, err
 	}
 	raw, err := os.ReadFile(filepath.Join(dir, rel))
 	if errors.Is(err, os.ErrNotExist) {
-		return nil, false, "", nil
+		return nil, false, nil
 	}
 	if err != nil {
-		return nil, false, "", err
+		return nil, false, err
 	}
-	return raw, true, "", nil
+	return raw, true, nil
 }

checks/trunk/trunk_test.go

@@ -17,27 +17,27 @@ func TestTheCloneBesideTheCheckIsTheTrunk(t *testing.T) {
 		t.Fatal(err)
 	}
 	t.Setenv(BesideEnv, beside)
-	raw, found, skip, err := Read("checks/x/known")
-	if err != nil || skip != "" || !found || string(raw) != "a\nb\n" {
-		t.Fatalf("read %q found %v skip %q err %v", raw, found, skip, err)
+	raw, found, err := Read("checks/x/known")
+	if err != nil || !found || string(raw) != "a\nb\n" {
+		t.Fatalf("read %q found %v err %v", raw, found, err)
 	}
-	if _, found, skip, err := Read("checks/x/absent"); err != nil || skip != "" || found {
-		t.Fatalf("a file the trunk does not hold: found %v skip %q err %v; wanted its first copy", found, skip, err)
+	if _, found, err := Read("checks/x/absent"); err != nil || found {
+		t.Fatalf("a file the trunk does not hold: found %v err %v; wanted its first copy", found, err)
 	}
 }
 
-func TestWithNothingBesideTheComparisonIsSkippedAndSaidNotMade(t *testing.T) {
+func TestWithNothingBesideTheComparisonFailsAndSaysNotMade(t *testing.T) {
 	t.Setenv(BesideEnv, "")
-	_, found, skip, err := Read("checks/x/known")
-	if found || err != nil || len(skip) < 12 || skip[:12] != "NOT COMPARED" {
-		t.Fatalf("found %v, skip %q, err %v; wanted NOT COMPARED", found, skip, err)
+	_, found, err := Read("checks/x/known")
+	if found || err == nil || !strings.Contains(err.Error(), "NOT COMPARED") {
+		t.Fatalf("found %v, err %v; wanted a failure saying NOT COMPARED", found, err)
 	}
 }
 
-func TestACloneBesideWithoutTheCatalogueIsSkippedAndSaidNotMade(t *testing.T) {
-	t.Setenv(BesideEnv, t.TempDir()) // the siblings are there, the catalogue's own base is not (the checker before R4g)
-	_, found, skip, err := Read("checks/x/known")
-	if found || err != nil || len(skip) < 12 || skip[:12] != "NOT COMPARED" || !strings.Contains(skip, "not beside") {
-		t.Fatalf("found %v, skip %q, err %v; wanted NOT COMPARED naming the missing copy", found, skip, err)
+func TestACloneBesideWithoutTheCatalogueFailsAndSaysNotMade(t *testing.T) {
+	t.Setenv(BesideEnv, t.TempDir()) // the siblings are there, the catalogue's own base is not
+	_, found, err := Read("checks/x/known")
+	if found || err == nil || !strings.Contains(err.Error(), "NOT COMPARED") || !strings.Contains(err.Error(), "not beside") {
+		t.Fatalf("found %v, err %v; wanted a failure naming the missing copy", found, err)
 	}
 }

checks/words/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/adwaita/internal/desktop/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/blueman/cmd/blueman-tools/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/brother/cmd/brother/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/forticlient/cmd/forticlient-tools/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/gitea/check.ts

@@ -83,6 +83,9 @@ export function checkStatusOf(change: OwedChange): { owner: string; repo: string
   return { owner, repo, sha, revision, status };
 }
 
+/** How many mesh/check writes this module has at the forge at once. */
+export const WRITES_AT_ONCE = 4;
+
 /** The one writer of mesh/check: each owed revision of the checker's, in revision order per key. */
 export class CheckStatuses {
   /** The newest revision written of each key, and the newest seen; the oldest keys go past what any forge holds open. */
@@ -91,6 +94,9 @@ export class CheckStatuses {
   /** The turn each key's writes wait on, and the asks again still running. */
   private turns = new Map<string, Promise<unknown>>();
   private again = new Set<Promise<void>>();
+  /** Writes at the forge at once, at most WRITES_AT_ONCE: a watch's start hands over every key together (issue 1726). */
+  private writing = 0;
+  private queued: (() => void)[] = [];
   private forge: CheckForge;
   private say: (line: string) => void;
   private sleep: (ms: number) => Promise<void>;
@@ -123,7 +129,7 @@ export class CheckStatuses {
         this.say(`[gitea] ${asked.owner}/${asked.repo}@${asked.sha.slice(0, 12)}: mesh/check at revision ${asked.revision} is older than ${newest}, already written, and is dropped`);
         return "dropped";
       }
-      await this.forge.setCommitStatus(asked.owner, asked.repo, asked.sha, asked.status);
+      await this.atTheForge(() => this.forge.setCommitStatus(asked.owner, asked.repo, asked.sha, asked.status));
       this.remember(this.written, key, asked.revision);
       return "written";
     });
@@ -133,19 +139,32 @@ export class CheckStatuses {
     return turn;
   }
 
-  /** What the watch hands over: written, or when the forge refuses, asked again on a bound in the background until it is
-   *  written or a newer revision of the key was seen. Never throws: a watch's handler that throws loses the change. */
+  /** What the watch hands over: taken at once and written in the background, or when the forge refuses, asked again on a
+   *  bound until it is written or a newer revision of the key was seen. Never throws: a watch's handler that throws loses
+   *  the change. It never waits on the forge (novox/hq issue 1726): the runtime hands a watch's current values one at a
+   *  time, waits for each to be taken and gives the whole set 10 s; a forge write per key made a large owed outlast that
+   *  bound at every attempt, so the watch never held and no verdict reached mesh/check. Each key's writes still take
+   *  turns in revision order (apply). */
   async take(change: OwedChange): Promise<void> {
+    const run = this.apply(change).then(() => {}, (err) => this.askAgain(change, err));
+    this.again.add(run);
+    void run.finally(() => this.again.delete(run));
+  }
+
+  /** Runs one forge write when fewer than WRITES_AT_ONCE are running, else after one ends. */
+  private async atTheForge<T>(write: () => Promise<T>): Promise<T> {
+    if (this.writing >= WRITES_AT_ONCE) await new Promise<void>((r) => this.queued.push(r));
+    else this.writing++;
     try {
-      await this.apply(change);
-    } catch (err) {
-      const run = this.askAgain(change, err);
-      this.again.add(run);
-      void run.finally(() => this.again.delete(run));
+      return await write();
+    } finally {
+      const next = this.queued.shift();
+      if (next) next();
+      else this.writing--;
     }
   }
 
-  /** Resolves when no ask again is running. */
+  /** Resolves when no write or ask again is running. */
   async settled(): Promise<void> {
     while (this.again.size) await Promise.all([...this.again]);
   }

modules/gitea/cmd/forge-account-provider/main.go

@@ -65,6 +65,7 @@ func configFromEnv(getenv func(string) string) (Config, error) {
 		HostFile:    getenv("MESH_FORGE_HOST_FILE"),
 		OriginsFile: getenv("MESH_GITEA_ORIGINS_FILE"),
 		Port:        port,
+		HostKeyFile: getenv("MESH_GITEA_HOST_KEY_FILE"), // optional
 		Forge: forgehttp.Client{URL: strings.TrimRight(getenv("MESH_GITEA_URL"), "/"), User: getenv("MESH_GITEA_ADMIN_USER"),
 			PasswordFile: getenv("MESH_GITEA_ADMIN_PASSWORD_FILE"), Timeout: 20 * time.Second},
 		Runner: execRunner{},

modules/gitea/cmd/forge-account-provider/service.go

@@ -44,10 +44,13 @@ type Config struct {
 	// origins, one per line.
 	HostFile, OriginsFile string
 	// Port is where the forge's sshd is published on the mesh.
-	Port   int
-	Forge  forgehttp.Client
-	Runner Runner
-	Log    func(format string, a ...any)
+	Port int
+	// HostKeyFile is the forge's own ed25519 host key (the .pub file in its data directory). It is read first; when it
+	// is unset or unreadable the forge's sshd is asked with ssh-keyscan instead (issue 1939).
+	HostKeyFile string
+	Forge       forgehttp.Client
+	Runner      Runner
+	Log         func(format string, a ...any)
 }
 
 // Service answers the consumers of the provision `forge-account` (novox/hq ADR 0399, ADR 0400; issue 955): for each
@@ -448,14 +451,30 @@ func (s *Service) httpsBase() (string, error) {
 	return "", fmt.Errorf("%s names no https origin", s.cfg.OriginsFile)
 }
 
-// scan reads the forge's ed25519 host key from its own sshd and writes it as the machines' known_hosts line.
+// scan gives the forge's ed25519 host key as the machines' known_hosts line. The key the forge itself holds is read
+// from its file first; only when that cannot be read is the forge's sshd asked over the network, and when that fails
+// too (the forge's container is restarting) the key read before is kept, as a host key does not change (issue 1939).
 func (s *Service) scan(ctx context.Context) (string, error) {
 	host, err := s.hostName()
 	if err != nil {
 		return "", err
 	}
+	if s.cfg.HostKeyFile != "" {
+		raw, ferr := os.ReadFile(s.cfg.HostKeyFile)
+		if ferr == nil {
+			if line, perr := knownHostLine("127.0.0.1 "+strings.TrimSpace(string(raw)), host, s.cfg.Port); perr == nil {
+				return line, nil
+			}
+		}
+	}
 	out, err := s.cfg.Runner.Run(ctx, "ssh-keyscan", "-t", "ed25519", "-p", fmt.Sprint(s.cfg.Port), "127.0.0.1")
 	if err != nil {
+		s.mu.Lock()
+		kept := s.known
+		s.mu.Unlock()
+		if kept != "" {
+			return kept, nil
+		}
 		return "", fmt.Errorf("the forge's ssh host key cannot be read: %w", err)
 	}
 	return knownHostLine(string(out), host, s.cfg.Port)

modules/gitea/cmd/forge-account-provider/service_test.go

@@ -696,3 +696,42 @@ func TestNothingIsSaidForAPerNodeUserWithoutMeshKeys(t *testing.T) {
 		}
 	}
 }
+
+// The forge's own host key file is read first: no scan over the network is needed (issue 1939).
+func TestTheHostKeyIsReadFromTheForgesOwnFile(t *testing.T) {
+	r := newRig(t)
+	f := filepath.Join(t.TempDir(), "ssh_host_ed25519_key.pub")
+	if err := os.WriteFile(f, []byte("ssh-ed25519 AAAAC3FILEKEY forge@host\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	r.svc.cfg.HostKeyFile = f
+	r.runner.err = errors.New("sshd down")
+	got, err := r.svc.scan(context.Background())
+	if err != nil || got != "[novox.internal]:222 ssh-ed25519 AAAAC3FILEKEY" {
+		t.Fatalf("scan = %q, %v", got, err)
+	}
+	if r.runner.args != nil {
+		t.Errorf("the forge's sshd was asked: %v", r.runner.args)
+	}
+}
+
+// A file that cannot be read falls back to the forge's sshd.
+func TestAnUnreadableHostKeyFileFallsBackToTheScan(t *testing.T) {
+	r := newRig(t)
+	r.svc.cfg.HostKeyFile = filepath.Join(t.TempDir(), "missing.pub")
+	got, err := r.svc.scan(context.Background())
+	if err != nil || got != "[novox.internal]:222 ssh-ed25519 AAAAC3HOSTKEY" {
+		t.Fatalf("scan = %q, %v", got, err)
+	}
+}
+
+// While the forge restarts, a key read before is kept: the sshd is not up, the key has not changed.
+func TestARestartingForgeKeepsTheKeyReadBefore(t *testing.T) {
+	r := newRig(t)
+	r.svc.known = "[novox.internal]:222 ssh-ed25519 AAAAC3HOSTKEY"
+	r.runner.err = errors.New("connection refused")
+	got, err := r.svc.scan(context.Background())
+	if err != nil || got != r.svc.known {
+		t.Fatalf("scan = %q, %v", got, err)
+	}
+}

modules/gitea/index.ts

@@ -589,7 +589,11 @@ if (gitea) {
   };
   // **The forge's events first, the polls as the safety net** (novox/hq issue 729): while verified deliveries arrive the
   // polls slow to every five minutes and announce only what no event said (Pace); otherwise they keep 30 s.
-  await listenForForge(client);
+  // **Not awaited** (novox/hq issue 1726): the receiver's set-up asks the forge's admin API, and the runtime kills a bundle
+  // whose import has not ended in its 10 s handshake and never starts it again; a forge slow to answer while every bundle
+  // of the node starts left gitea_commit_status, gitea_merge_pull_request and gitea_events served nowhere. Until it is
+  // listening, Pace keeps the polls at 30 s, so nothing is missed meanwhile; listenForForge says its own failure.
+  void listenForForge(client);
   // Main takes no push and only the tools' account merges, in every repository, kept and not only when a token is
   // minted: at the start and every ten minutes after, so a repository made later gets it too (issue 948, ADR 0398 §2).
   // Only while the setting keep-main-rules is true (mainrules.ts); false, the default, leaves every repository's rule as set.

modules/gitea/mainrules.ts

@@ -15,6 +15,19 @@ export function keepMainRules(env: NodeJS.ProcessEnv = process.env): boolean {
   } catch { return false; }
 }
 
+/** The setting check-gates-merge (the operator, 2026-10-25 22:56: "run the check locally only, but not as a gate, it loses
+ *  us too much time"): whether the merge tool judges mesh/check before it merges. Absent, unreadable or anything but false
+ *  is true; false lets a head the operator's Approve names merge with mesh/check pending, failed, missing or judged on an
+ *  older trunk (mesh-delivery-gate's setting of the same name stops waiting for it before the Approve). */
+export function checkGatesMerge(env: NodeJS.ProcessEnv = process.env): boolean {
+  const file = env.MESH_GITEA_CONFIG_FILE;
+  if (!file) return true;
+  try {
+    const v = (JSON.parse(readFileSync(file, "utf8")) as Record<string, unknown>)["check-gates-merge"];
+    return !(v === false || v === "false");
+  } catch { return true; }
+}
+
 /** The 10-minute step: puts the rules right only when kept; else says once that they are left and writes nothing. */
 export function mainRulesStep(keep: boolean, put: () => Promise<string[]>, say: (line: string) => void): () => Promise<void> {
   let said = false;

modules/gitea/merge.ts

@@ -19,6 +19,7 @@ import { mergeableUnder, newestByContext } from "./checks.js";
 import { MERGE_METHODS, Refused, checkName } from "./guard.js";
 import { CHECK_CONTEXT, CHECK_STATUS, REPO_CHECK_CONTEXT, maintained, requiredOf } from "./pulls.js";
 import { approvedHeadsOf, groupRefusal, memberKey, namesSiblings, notApproved, readSiblings, siblingOutOfDate, siblingsFile } from "./siblings.js";
+import { checkGatesMerge } from "./mainrules.js";
 import { announcementOf, askedWords, outOfDateWords, sameCommit, tookFile, tookWords, twelve, verdictAtTrunk, waitsForComposed } from "./trunk.js";
 
 /** A head named for a merge: at least 12 hex characters of its sha (novox/hq issue 381), up to a sha-256 commit's 64. */
@@ -31,11 +32,13 @@ export interface MergeDeps {
   emit?: (type: string, body: unknown) => Promise<void>;
   stateDir?: string;
   now?: () => Date;
+  /** Whether mesh/check gates the merge: the setting check-gates-merge, read at each merge (mainrules.ts). */
+  checkGates?: () => boolean;
 }
 
 export function mergeTool(gitea: GiteaClient, given: MergeDeps): ToolDefinition {
   const deps = { ...given, emit: given.emit ?? announce, stateDir: given.stateDir ?? process.env.MESH_GITEA_STATE_DIR,
-    now: given.now ?? (() => new Date()) };
+    now: given.now ?? (() => new Date()), checkGates: given.checkGates ?? (() => checkGatesMerge()) };
   return {
     name: "gitea_merge_pull_request",
     description: "Merge a pull request at the head you name — the commit you reviewed — when that is still its head, " +
@@ -126,7 +129,10 @@ export function mergeTool(gitea: GiteaClient, given: MergeDeps): ToolDefinition
       }
       const kept = maintained(required);
       const byCheck = required.includes(CHECK_STATUS) || kept.length === 0;
-      if (byCheck) {
+      // **check-gates-merge false** (the operator, 2026-10-25): mesh/check is information, not a gate. A head the operator's
+      // Approve names merges whatever its mesh/check says, pending, failed, missing or judged on an older trunk; without
+      // approved_heads the check still judges.
+      if (byCheck && (deps.checkGates() || !approved)) {
         // **mesh/check is the checker's** (ADR 0447 §4): it is judged here against the trunk's head, and refused when it
         // is not current; nothing is written or asked — the checker checks a head again when its trunk moves.
         const check = checks[CHECK_STATUS];

modules/gitea/module.json

@@ -181,6 +181,12 @@
       "trusted": true,
       "default": {}
     },
+    "check-gates-merge": {
+      "type": "boolean",
+      "description": "Whether gitea_merge_pull_request judges mesh/check before it merges. True (the default): a head merges only on a passing mesh/check judged against the trunk's head (ADR 0447, ADR 0534 §4). False (the operator, 2026-10-25 22:56: \"run the check locally only, but not as a gate, it loses us too much time\"): a head the operator's Approve names in approved_heads merges whatever its mesh/check says (pending, failed, missing or judged on an older trunk); a head that moved, a branch no rule guards and a merge git refuses are still refused. Set together with mesh-delivery-gate's check-gates-merge.",
+      "trusted": true,
+      "default": true
+    },
     "main-mergers": {
       "type": "list",
       "description": "The forge logins that may merge into main beside the tools' account, on every repository of the organisation (ADR 0534 §2): the operator's own, so the operator can always merge by hand at the forge. The tools' account is always on main's merge whitelist; no agent's account belongs here.",
@@ -316,7 +322,8 @@
       "takes-config": [
         "url",
         "keep-main-rules",
-        "main-mergers"
+        "main-mergers",
+        "check-gates-merge"
       ]
     },
     {
@@ -537,6 +544,7 @@
           "MESH_GITEA_ADMIN_PASSWORD_FILE": "${dir:state}/admin.secret",
           "MESH_GITEA_ORIGINS_FILE": "${dir:mesh-state}/origins",
           "MESH_GITEA_SSH_PORT": "222",
+          "MESH_GITEA_HOST_KEY_FILE": "${dir:data}/ssh/ssh_host_ed25519_key.pub",
           "MESH_FORGE_HOST_FILE": "/etc/gitea/forge-host"
         }
       }

modules/gitea/test/bundle-import.test.ts

@@ -109,3 +109,53 @@ test("a bundle whose read of the checker's owed is granted late writes the lates
   assert.match(got.statuses[0], /"state":"success".*pass at 4/);
   assert.match(err, /mesh-delivery-checker\.owed could not be bound/, "the refusal is said");
 });
+
+// **The bundle's import does not wait on the forge** (novox/hq issue 1726, 2026-10-24 12:37). The webhook receiver's set-up
+// asks the forge's admin API for its system webhook; awaited at the top of index.ts, a forge slow to answer (busy while
+// every bundle of the node starts) held the import past node-tools' 10 s handshake, the bundle was killed and never
+// started again, and gitea_commit_status, gitea_merge_pull_request and gitea_events were served nowhere: the forge
+// bridge's calls found no responders and no new pull request was announced. Here the forge stand-in takes every
+// request and never answers: the import resolves at once all the same, with the bundle's tools registered.
+test("importing the bundle resolves, its tools registered, while the forge never answers the webhook's set-up", async () => {
+  const index = pathToFileURL(join(here, "..", "dist", "index.js")).href;
+  const script = `
+    const http = await import("node:http");
+    const fs = await import("node:fs");
+    const os = await import("node:os");
+    const path = await import("node:path");
+    const forge = http.createServer(() => {});
+    await new Promise((r) => forge.listen(0, "127.0.0.1", r));
+    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "gitea-1726-"));
+    fs.writeFileSync(path.join(dir, "admin.password"), "pw");
+    process.env.MESH_GITEA_URL = "http://127.0.0.1:" + forge.address().port;
+    process.env.MESH_GITEA_STATE_DIR = dir;
+    process.env.MESH_GITEA_ADMIN_PASSWORD_FILE = path.join(dir, "admin.password");
+    process.env.MESH_GITEA_HOOK_PORT = "0";
+    process.env.MESH_GITEA_HOOK_HOST = "127.0.0.1";
+    const { useBroker } = await import("@novox/mesh-sdk/messaging");
+    useBroker(() => ({
+      subscribe: async () => () => {}, publish: async () => {}, request: async () => { throw new Error("no responders"); },
+      handle: async () => () => {}, close: async () => {},
+    }));
+    await import(${JSON.stringify(index)});
+    const { collectTools } = await import("@novox/mesh-sdk/tools");
+    console.log(JSON.stringify({ imported: true, tools: collectTools().flatMap((r) => r.tools.map((t) => t.name)) }));
+    process.exit(0);`;
+  const env = { ...process.env, MESH_GITEA_TOKEN: "x", MESH_GITEA_ADMIN_USER: "admin", MESH_GITEA_HOOK_URL: "http://127.0.0.1:1" };
+  for (const k of ["MESH_SERVED_MODULE", "MESH_GITEA_ADMIN_PASSWORD", "MESH_GITEA_CONFIG_FILE"]) delete env[k];
+  const child = spawn(process.execPath, ["--input-type=module", "-e", script], { cwd: join(here, ".."), env, stdio: ["ignore", "pipe", "pipe"] });
+  let out = "";
+  let err = "";
+  child.stdout.on("data", (d) => (out += d));
+  child.stderr.on("data", (d) => (err += d));
+  const ended = new Promise<void>((r) => child.on("exit", () => r()));
+  const timer = setTimeout(() => child.kill("SIGKILL"), 3000);
+  await ended;
+  clearTimeout(timer);
+  const line = out.split("\n").find((l) => l.startsWith("{"));
+  assert.ok(line, `the import did not resolve within 3 s while the forge did not answer; stdout: ${out.slice(0, 400)} stderr: ${err.slice(0, 600)}`);
+  const got = JSON.parse(line!) as { tools: string[] };
+  for (const t of ["gitea_events", "gitea_commit_status", "gitea_merge_pull_request"]) {
+    assert.ok(got.tools.includes(t), `${t} is registered: ${got.tools}`);
+  }
+});

modules/gitea/test/check-owed.test.ts

@@ -133,3 +133,45 @@ test("no tool writes mesh/check: gitea_check_status is gone and gitea_commit_sta
   const index = readFileSync(new URL("../index.ts", import.meta.url), "utf8");
   assert.ok(!/gitea_check_status|checkStatusTool/.test(index), "index.ts serves no gitea_check_status");
 });
+
+test("the watch's current values are taken without waiting on the forge, so a slow forge never times the watch out (issue 1726)", async () => {
+  // The tool runtime hands a watch's current values one at a time and waits for each to be taken; it gives the whole set
+  // 10 s (mesh-tools StateTimeout) and otherwise ends the watch. On 2026-10-23 the owed held ~200 keys, each written to the
+  // forge before the next was handed over: the set took longer than 10 s, the watch ended at every attempt, and no
+  // verdict reached the forge's mesh/check again.
+  const { CheckStatuses, watchOwed } = await import("../check.ts");
+  const sent: string[] = [];
+  let release: () => void = () => {};
+  const slow = new Promise<void>((r) => { release = r; });
+  const f = { setCommitStatus: async (_o: string, _r: string, s: string, st: any) => { await slow; sent.push(`${s.slice(0, 4)} ${st.state}`); } };
+  const checks = new CheckStatuses(f, () => {}, noSleep);
+  const keys = Array.from({ length: 200 }, (_, i) => key(i.toString(16).padStart(4, "0") + sha.slice(4), "novox/mesh-sdk", i + 1));
+  let handedOver = 0;
+  let attempts = 0;
+  const watch = async (handler: (c: any) => Promise<void>) => {
+    if (++attempts > 1) return; // a second attempt is not what this test waits for: the first must hold
+    // The runtime's bound on the current values: the forge has answered none of them yet.
+    const timedOut = new Promise<"timeout">((r) => setTimeout(() => r("timeout"), 200));
+    const delivered = (async () => { for (const [i, k] of keys.entries()) { await handler(put(k, owed(), i + 1, true)); handedOver++; } return "delivered" as const; })();
+    if (await Promise.race([delivered, timedOut]) === "timeout") throw new Error("the current values of mesh-delivery-checker.owed did not arrive in 10s");
+  };
+  const said: string[] = [];
+  await watchOwed(watch, checks, noSleep, (l) => said.push(l));
+  assert.equal(handedOver, 200, "every current value was taken before the forge answered");
+  assert.ok(!said.some((l) => /could not be bound/.test(l)), said.join(" | "));
+  assert.equal(sent.length, 0, "nothing is written before the forge answers");
+  release();
+  await checks.settled();
+  assert.equal(sent.length, 200, "every owed status is written once the forge answers");
+});
+
+test("the writes a watch's start hands over go to the forge a few at a time, never all at once (issue 1726)", async () => {
+  const { CheckStatuses, WRITES_AT_ONCE } = await import("../check.ts");
+  let running = 0, most = 0, done = 0;
+  const f = { setCommitStatus: async () => { running++; most = Math.max(most, running); await new Promise((r) => setTimeout(r, 1)); running--; done++; } };
+  const checks = new CheckStatuses(f, () => {}, noSleep);
+  for (let i = 0; i < 50; i++) await checks.take(put(key(i.toString(16).padStart(4, "0") + sha.slice(4), "novox/mesh-sdk", i + 1), owed(), i + 1, true));
+  await checks.settled();
+  assert.equal(done, 50);
+  assert.equal(most, WRITES_AT_ONCE);
+});

modules/gitea/test/guard.test.ts

@@ -525,6 +525,18 @@ test("gitea_merge_pull_request judges mesh/check on a main requiring no status,
 
   state.statuses = line(TRUNK);
   assert.equal(((await merge()) as Record<string, unknown>).merged, true);
+
+  // check-gates-merge false (the operator, 2026-10-25): a head the Approve names merges whatever its mesh/check says;
+  // without approved_heads it is refused as before.
+  const ungated = mergeTool(client, { gates, stateDir, emit: async () => {}, checkGates: () => false });
+  const mergeUngated = (args: Record<string, unknown> = { approved_heads }) =>
+    ungated.run({ owner: "novox", repo: "mesh-catalog", number: 7, head: REVIEWED, ...args });
+  for (const statuses of [[], line(TRUNK, "pending", "checking"), line(TRUNK, "failure", "fail"), line(MOVED)]) {
+    state.merged = false;
+    state.statuses = statuses;
+    await assert.rejects(mergeUngated({}), /Approve/);
+    assert.equal(((await mergeUngated()) as Record<string, unknown>).merged, true, JSON.stringify(statuses));
+  }
 });
 
 test("a rule named for a branch is not made weaker than the glob rule that guards it now", async () => {

modules/gitea/tools/index.ts

@@ -508,11 +508,11 @@ function allGiteaTools(gitea: GiteaClient, admin?: () => GiteaAdmin): ToolDefini
         if (!owner || !repo) throw new Error("name the repository: owner and repo");
         if (!Number.isInteger(number) || number < 0) throw new Error(`${args.number} is not a pull request's number`);
         let pull: { number: number; title: string; state: string; merged: boolean; base?: string; head?: string;
-          head_sha?: string; merge_commit_sha?: string; html_url: string } | undefined;
+          head_sha?: string; merge_commit_sha?: string; merged_at?: string; html_url: string } | undefined;
         if (number > 0) {
           const p = await gitea.getPullRequest(owner, repo, number);
           pull = { number: p.number, title: p.title, state: p.state, merged: p.merged, base: p.base, head: p.head,
-            head_sha: p.head_sha, merge_commit_sha: p.merge_commit_sha, html_url: p.html_url };
+            head_sha: p.head_sha, merge_commit_sha: p.merge_commit_sha, merged_at: p.merged_at, html_url: p.html_url };
           if (!ref) ref = p.head_sha ?? "";
           if (!base) base = p.base ?? "";
           if (!ref) throw new Error(`${owner}/${repo}#${number} names no head commit`);

modules/i3/internal/desktop/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/lemurs/internal/desktop/reads-outside

@@ -0,0 +1 @@
+These tests read files outside this directory (the whole catalogue, the repository, or its root files): mesh-build-go never keeps this package's verdict (issue 1935).

modules/mesh-build-go/README.md

@@ -102,7 +102,11 @@ integration level, the postgres major and the nats-server version; and, when the
 workspace (`beside`), each one's repository and commit, which the answer echoes as `beside` (the checker keeps a verdict only
 for the siblings it was judged with). The text's form is `DigestVersion` 3. The Go version is not in it: the toolchain enters a
 fingerprint once, as the version the build nodes agree on (ADR 0477 §3), and the standard library's packages are that
-version's. A package with no tests at the level has no digest and is named in `without_tests`. A directory that vendors
+version's. A package with no tests at the level has no digest and is named in `without_tests`. A catalogue module's packages also hash the module's non-Go files (the nearest ancestor directory holding `module.json`: its manifest, README, `files/` and the rest, so `../../module.json` is covered; digest form 5). A package whose directory holds a file named `reads-outside` (any content; say what the tests read) is never kept (issue 1935): its tests read
+files outside it, which a digest from `go list` cannot name, so its digest is a fresh random one on every call, the ask finds no kept
+verdict for it and runs it, and the answer names it in `reads_outside` and the module's log says why. The checker still writes a
+verdict under that digest, which nothing ever reads again. The marker is the plain way to say it until each verdict keeps the files
+its tests opened (Go's test log). A directory that vendors
 is listed and tested from its vendor directory (`-mod=vendor`).
 
 ## A change to this module is judged by its candidate

modules/mesh-build-go/cmd/mesh-build-go/announce.go

@@ -14,6 +14,7 @@ var Kept = []announce.State{
 	{Name: "toolchains", Readable: true},
 	{Name: "keys", Readable: true},
 	{Name: "steps", Readable: true},
+	{Name: "pauses", Readable: true},
 }
 
 // keepStates announces Kept as this module's (stdio.Keeps): main calls it before it serves.

modules/mesh-build-go/cmd/mesh-build-go/asks.go

@@ -80,19 +80,23 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskGo}
 	}
 	capacity := m.Capacity
+	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
+	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
+	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
+		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
-	if m.ReadSteps.Get != nil {
+	if m.ReadPauses.Get != nil {
 		load = func(key string) ([]byte, error) {
-			raw, err := m.ReadSteps.Get(key)
+			raw, err := m.ReadPauses.Get(key)
 			return raw, err
 		}
 	}
-	return &buildstep.Puller{Source: source, Language: delivery.AskGo, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, Logf: m.Say,
+	return &buildstep.Puller{Source: source, Language: delivery.AskGo, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load,
+		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
 				return nil, err
@@ -100,6 +104,9 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 			if err := m.room(); err != nil {
 				return nil, err
 			}
+			if a.Compose != nil {
+				return m.compose(ctx, ask.Fetch, a)
+			}
 			return buildstep.RunAsk(ctx, ask, a)
 		}}
 }

modules/mesh-build-go/cmd/mesh-build-go/asks_integration_test.go

@@ -4,7 +4,6 @@ package main
 
 import (
 	"context"
-	"os"
 	"sync"
 	"testing"
 	"time"
@@ -14,16 +13,25 @@ import (
 
 	"git.novox.be/novox/mesh-sdk/go/buildstep"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/testbus"
 )
 
+// checkCommit is the commit the check ask fetches, apart from the delivery ask's, so the fetch order names which ran first.
+const checkCommit = "89abcdef0123456789abcdef0123456789abcdef"
+
 // 1887/AC-order, 1887/AC-pull against the real bus: a check ask published before a delivery ask runs after it, and at
 // capacity 1 the second waits in the stream until the first ends.
+//
+// **A bus of its own.** The integration level runs every directory's tests at once on one bus, and this test names the
+// build seat's stream and its fixed workers (SEAT_NODE_BUILD_GO and its workers) and deletes the stream at its end, so
+// anything else on that bus, a puller or a leftover consumer, could hold or take its delivery ask and let the check
+// ask run first. It starts from testbus (mesh-sdk, novox/hq ADR 0495 clause 5): a bus for this test alone, gone after it.
+//
+// **The order is read from the record.** At capacity 1 the puller starts the check the instant the delivery ask's step
+// ends, well before any poll, so "the check key holds a state" is true on correct behaviour (issue 1887). The test
+// waits for both asks to end and compares the step records' own Started and Ended times, and the fetch order by commit.
 func TestTheModuleTakesADeliveryAskBeforeAnEarlierCheck(t *testing.T) {
-	url := os.Getenv("MESH_TEST_NATS")
-	if url == "" {
-		t.Skip("MESH_TEST_NATS names no bus: the integration level starts one")
-	}
-	nc, err := nats.Connect(url)
+	nc, err := nats.Connect(testbus.URL(t))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -40,6 +48,7 @@ func TestTheModuleTakesADeliveryAskBeforeAnEarlierCheck(t *testing.T) {
 	t.Cleanup(func() { _ = js.DeleteStream(context.Background(), "SEAT_NODE_BUILD_GO") })
 	check := deliveryAsk()
 	check.Kind = delivery.AskCheck
+	check.Build.Fetch["commit"] = checkCommit
 	first := deliveryAsk()
 	for _, a := range []delivery.StepAsk{check, first} {
 		raw, _ := delivery.EncodeStepAsk(a)
@@ -68,30 +77,36 @@ func TestTheModuleTakesADeliveryAskBeforeAnEarlierCheck(t *testing.T) {
 	p := m.Puller(steps, &buildstep.JetStreamAsks{JS: js, Language: delivery.AskGo})
 	p.PullWait = 200 * time.Millisecond
 	go p.Pull(ctx)
-	for _, a := range []delivery.StepAsk{first, check} {
-		key, _ := delivery.AskStepKey("ace", a.ID)
-		for deadline := time.Now().Add(10 * time.Second); ; time.Sleep(10 * time.Millisecond) {
-			states.mu.Lock()
-			v := states.steps[key]
-			states.mu.Unlock()
-			if len(v) > 0 && v[len(v)-1].State != delivery.StepRunning {
-				break
-			}
-			if time.Now().After(deadline) {
-				t.Fatalf("the ask %s (%s) never ended", a.ID, a.Kind)
-			}
-		}
+	var ran map[string][]delivery.Step
+	for deadline := time.Now().Add(10 * time.Second); ; time.Sleep(10 * time.Millisecond) {
+		ran = map[string][]delivery.Step{}
+		ended := 0
 		states.mu.Lock()
-		checkKey, _ := delivery.AskStepKey("ace", check.ID)
-		if a.ID == first.ID && len(states.steps[checkKey]) > 0 {
-			states.mu.Unlock()
-			t.Fatal("the check ask started before the delivery ask ended at capacity 1")
+		for _, a := range []delivery.StepAsk{first, check} {
+			key, _ := delivery.AskStepKey("ace", a.ID)
+			v := append([]delivery.Step(nil), states.steps[key]...)
+			ran[a.ID] = v
+			if len(v) > 0 && v[len(v)-1].State != delivery.StepRunning {
+				ended++
+			}
 		}
 		states.mu.Unlock()
+		if ended == 2 {
+			break
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("the asks never both ended: %v", ran)
+		}
+	}
+	// The check's step may start the moment the delivery's ends, so the order is read from the records' own times.
+	deliveryEnded := ran[first.ID][len(ran[first.ID])-1].Ended
+	checkStarted := ran[check.ID][0].Started
+	if checkStarted.Before(deliveryEnded) {
+		t.Fatalf("the check ask started at %v, before the delivery ask ended at %v at capacity 1", checkStarted, deliveryEnded)
 	}
 	mu.Lock()
 	defer mu.Unlock()
-	if len(order) != 2 {
-		t.Fatalf("fetched %v", order)
+	if len(order) != 2 || order[0] != askCommit || order[1] != checkCommit {
+		t.Fatalf("fetched %v, want the delivery ask's commit %s first, then the check's %s", order, askCommit, checkCommit)
 	}
 }

modules/mesh-build-go/cmd/mesh-build-go/asks_test.go

@@ -174,7 +174,7 @@ func TestACheckAsksDigestIsTheToolsAnswerInTheCall(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if l := out.(delivery.CheckAnswer).Levels; len(l) != 1 || !strings.Contains(string(l[0].Digest), `"x/a":"d1"`) {
+	if l := out.(delivery.CheckAnswer).Levels; len(l) != 1 || l[0].Digest.Map()["x/a"] != "d1" {
 		t.Fatalf("levels = %+v, want the digest's packages", l)
 	}
 }

modules/mesh-build-go/cmd/mesh-build-go/beside_digest_test.go

@@ -116,7 +116,7 @@ func TestTheIntegrationLevelDigestsUnderBothTags(t *testing.T) {
 			t.Errorf("the integration digest listed %q", s.command)
 		}
 	}
-	if DigestVersion != "4" {
+	if DigestVersion != "5" {
 		t.Errorf("the digest's form changed in kind and is still version %s", DigestVersion)
 	}
 }

modules/mesh-build-go/cmd/mesh-build-go/compose.go

@@ -0,0 +1,210 @@
+package main
+
+// **A compose ask runs mesh-sdk's composer at a commit** (novox/hq ADR 0482 clause 4, issues 1621 and 1622): the
+// assigner asks it, to compose a group with its mesh-sdk member's head, and to read the group's manifests with the
+// mesh-sdk the running controller and node-engine pin (ADR 0482 clause 5, issue 1623). The module fetches the commit
+// (its fetch step: the forge key and the network, none of the change's code), builds the composer package in the Go
+// module the ask names, in a run step shut off with nothing fetched, and keeps the program under its key
+// (delivery.ComposerKey), so each commit is built once on a node. It fills the request's manifests from the delivery
+// indexer's manifests state, by digest, and runs the program shut off: no network, none of the account, the request a
+// file of a workspace of its own. The answer is the composer's verdict whole (delivery.ComposeAnswer); the module
+// judges nothing of it.
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+	"git.novox.be/novox/mesh-sdk/go/composer"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// ManifestsState is the delivery indexer's manifests by digest, which a compose ask's request names (the module reads
+// it, module.json reads).
+const ManifestsState = delivery.IndexerModule + ".manifests"
+
+// composerLocks hold one mutex per composer key, so a composer two asks need at once is built once.
+var composerLocks sync.Map
+
+// composerPath is where the composer of key is kept: the cache directory, beside Go's own caches.
+func (m *Module) composerPath(key string) string {
+	return filepath.Join(m.Cache, "composers", key, "mesh-compose")
+}
+
+// compose runs a compose ask: the composer of its commit, built once, over its request with the manifests filled.
+func (m *Module) compose(ctx context.Context, fetch buildstep.StepFunc, a delivery.StepAsk) (any, error) {
+	job := *a.Compose
+	repository, _ := job.Fetch["repository"].(string)
+	commit, _ := job.Fetch["commit"].(string)
+	installed, err := m.Probe(ctx)
+	if err != nil {
+		return nil, err
+	}
+	key := delivery.ComposerKey(repository, commit, job.Dir, job.Package, delivery.ToolchainUsed{Version: installed, Recipe: m.Recipe.Version()})
+	exe, built, err := m.composerOf(ctx, fetch, job, key)
+	if err != nil {
+		return nil, err
+	}
+	req, err := composer.Decode(job.Request)
+	if err != nil {
+		return nil, buildstep.Refuse("the compose ask %s: %v", a.ID, err)
+	}
+	if err := composer.Fill(&req, m.manifestOf); err != nil {
+		return nil, err
+	}
+	verdict, err := m.runComposer(ctx, exe, req)
+	if err != nil {
+		return nil, err
+	}
+	return delivery.ComposeAnswer{Built: built, Key: key, Verdict: verdict}, nil
+}
+
+// manifestOf is the manifest the indexer keeps under digest, as its repository holds it.
+func (m *Module) manifestOf(digest string) ([]byte, error) {
+	if m.ReadManifest == nil {
+		return nil, errors.New("this module reads no manifests state")
+	}
+	key, err := delivery.ManifestsKey(digest)
+	if err != nil {
+		return nil, err
+	}
+	raw, err := m.ReadManifest(key)
+	if err != nil {
+		return nil, err
+	}
+	if raw == nil {
+		return nil, fmt.Errorf("the indexer keeps no manifest of digest %s", digest)
+	}
+	man, err := delivery.DecodeManifest(raw)
+	if err != nil {
+		return nil, err
+	}
+	return []byte(man.JSON), nil
+}
+
+// composerOf is the composer kept under key, or, when none is, the one built now from the fetched commit (built true).
+func (m *Module) composerOf(ctx context.Context, fetch buildstep.StepFunc, job delivery.ComposeJob, key string) (string, bool, error) {
+	exe := m.composerPath(key)
+	mu, _ := composerLocks.LoadOrStore(exe, &sync.Mutex{})
+	mu.(*sync.Mutex).Lock()
+	defer mu.(*sync.Mutex).Unlock()
+	if st, err := os.Stat(exe); err == nil && st.Mode().IsRegular() {
+		return exe, false, nil
+	}
+	if fetch == nil {
+		return "", false, buildstep.Refuse("this build module fetches nothing")
+	}
+	out, err := fetch(ctx, job.Fetch)
+	if err != nil {
+		return "", false, err
+	}
+	raw, err := json.Marshal(out)
+	if err != nil {
+		return "", false, err
+	}
+	var f struct {
+		Workspace string `json:"workspace"`
+	}
+	if err := json.Unmarshal(raw, &f); err != nil || f.Workspace == "" {
+		return "", false, fmt.Errorf("the fetch answered no workspace: %s", raw)
+	}
+	defer m.releaseSaid(f.Workspace)
+	done := m.spaces().Hold(f.Workspace)
+	defer done()
+	dir := filepath.Join(m.Work, f.Workspace, "tree", job.Dir)
+	if _, err := os.Stat(filepath.Join(dir, "go.mod")); err != nil {
+		return "", false, fmt.Errorf("%s at %s holds no go.mod in %s, so no composer can be built there", job.Fetch["repository"], job.Fetch["commit"], job.Dir)
+	}
+	into := filepath.Join(m.Work, f.Workspace, "composer", "mesh-compose")
+	if err := os.MkdirAll(filepath.Dir(into), 0o700); err != nil {
+		return "", false, err
+	}
+	run, err := m.stepRunner(f.Workspace, false)
+	if err != nil {
+		return "", false, err
+	}
+	env := append(m.goEnvFor(dir), "GOPROXY=off", "GOTOOLCHAIN=local", "CGO_ENABLED=0")
+	r := run(ctx, env, "go", "-C", dir, "build", "-trimpath", "-o", into, job.Package)
+	if r.Status != 0 || r.Err != "" {
+		// The words Go says when the module holds no such package (a mesh-sdk from before the composer) are kept whole,
+		// so the asker tells that apart from a fault.
+		return "", false, fmt.Errorf("the composer %s does not build at %s: %s", job.Package, job.Fetch["commit"], compileError(r.Err+"\n"+r.Stderr+"\n"+r.Stdout))
+	}
+	if err := copyExecutable(into, exe); err != nil {
+		return "", false, fmt.Errorf("the composer could not be kept: %w", err)
+	}
+	return exe, true, nil
+}
+
+// copyExecutable copies a built program into place through a file beside it, so a half-written program is never kept.
+func copyExecutable(from, to string) error {
+	if err := os.MkdirAll(filepath.Dir(to), 0o700); err != nil {
+		return err
+	}
+	src, err := os.Open(from)
+	if err != nil {
+		return err
+	}
+	defer src.Close()
+	tmp := to + ".new"
+	dst, err := os.OpenFile(tmp, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o700)
+	if err != nil {
+		return err
+	}
+	if _, err := io.Copy(dst, src); err != nil {
+		dst.Close()
+		return err
+	}
+	if err := dst.Close(); err != nil {
+		return err
+	}
+	return os.Rename(tmp, to)
+}
+
+// releaseSaid removes a workspace once its steps ended, saying a failure: the sweep removes it later.
+func (m *Module) releaseSaid(workspace string) {
+	if err := m.spaces().Release(workspace); err != nil && m.Say != nil {
+		m.Say("the compose ask's workspace %s: %v", workspace, err)
+	}
+}
+
+// runComposer runs the composer over req in a workspace of its own, shut off, and answers its verdict: the last line of
+// its standard output, a composer.Verdict of the version this module reads.
+func (m *Module) runComposer(ctx context.Context, exe string, req composer.Request) (json.RawMessage, error) {
+	id := buildstep.NewID()
+	done := m.spaces().Hold(id)
+	defer m.releaseSaid(id)
+	defer done()
+	ws := filepath.Join(m.Work, id)
+	if err := os.MkdirAll(ws, 0o700); err != nil {
+		return nil, err
+	}
+	raw, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+	file := filepath.Join(ws, "request.json")
+	if err := os.WriteFile(file, raw, 0o600); err != nil {
+		return nil, err
+	}
+	run := m.Run
+	if !m.Inside {
+		iso := m.isolation(id, false)
+		iso.ReadOnly = append(iso.ReadOnly, exe)
+		run = buildstep.Isolated(m.Run, iso)
+	}
+	r := run(ctx, nil, exe, "-request", file)
+	line := strings.TrimSpace(lastLine(r.Stdout))
+	var v composer.Verdict
+	if r.Status != 0 || r.Err != "" || json.Unmarshal([]byte(line), &v) != nil || v.V != composer.Version {
+		return nil, fmt.Errorf("the composer answered no verdict (status %d %s): %s", r.Status, r.Err, firstLine(r.Stderr+"\n"+r.Stdout))
+	}
+	return json.RawMessage(line), nil
+}

modules/mesh-build-go/cmd/mesh-build-go/compose_integration_test.go

@@ -0,0 +1,156 @@
+//go:build integration
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/nats-io/nats.go"
+	"github.com/nats-io/nats.go/jetstream"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+	"git.novox.be/novox/mesh-sdk/go/composer"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/forgekey"
+	"git.novox.be/novox/mesh-sdk/go/testbus"
+)
+
+// sdkPin is the mesh-sdk version this module's go.mod requires: the composer the test builds is that version's.
+func sdkPin(t *testing.T) string {
+	t.Helper()
+	raw, err := os.ReadFile("../../go.mod")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, l := range strings.Split(string(raw), "\n") {
+		if f := strings.Fields(l); len(f) >= 2 && f[0] == "git.novox.be/novox/mesh-sdk/go" {
+			return f[1]
+		}
+	}
+	t.Fatal("go.mod requires no mesh-sdk")
+	return ""
+}
+
+// goEnvOf is one value of this machine's go env.
+func goEnvOf(t *testing.T, name string) string {
+	t.Helper()
+	out, err := exec.Command("go", "env", name).Output()
+	if err != nil {
+		t.Fatalf("go env %s: %v", name, err)
+	}
+	return strings.TrimSpace(string(out))
+}
+
+// 1622/AC1, AC3 against the real bus: a compose ask put on the Go build seat's check stream is pulled by the module
+// started whole on that bus, which fetches the commit (here a tree of a module requiring mesh-sdk at this module's pin,
+// as a reader repository is), builds mesh-sdk's composer there with nothing fetched, fills the request's manifests from
+// the indexer's state and runs the composer; the step key <node>.<ask id> passes with the composer's verdict. A second
+// ask of the same commit runs the kept composer: fetched and built once.
+func TestAComposeAskIsBuiltOnceAndAnsweredOnTheBus(t *testing.T) {
+	nc, err := nats.Connect(testbus.URL(t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer nc.Close()
+	js, err := jetstream.New(nc)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, stop := context.WithCancel(context.Background())
+	defer stop()
+	if err := buildstep.DeclareAskWorkers(ctx, js, delivery.AskGo, 2*time.Minute); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = js.DeleteStream(context.Background(), "SEAT_NODE_BUILD_GO") })
+
+	states := newStates()
+	m := moduleWith(states, "go1.26.0")
+	m.Work, m.Cache, m.Inside = t.TempDir(), t.TempDir(), true
+	m.Run = StepRunner(t.TempDir())
+	m.GoModCache = goEnvOf(t, "GOMODCACHE")      // the module cache this module's own build filled, read and not fetched
+	run, gocache := m.Run, goEnvOf(t, "GOCACHE") // this machine's build cache, so the composer's packages compile once
+	m.Run = func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		return run(ctx, append(env, "GOCACHE="+gocache), name, args...)
+	}
+	read, digests := indexerHolds(t, `{"module":"demo","version":"1"}`)
+	m.ReadManifest = read
+
+	gosum, err := os.ReadFile("../../go.sum")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fetches := 0
+	steps := fakeSteps(new([]string))
+	for i := range steps {
+		if steps[i].Name == "build_go_fetch" {
+			steps[i].Run = func(ctx context.Context, args map[string]any) (any, error) {
+				fetches++
+				ws := buildstep.NewID()
+				tree := filepath.Join(m.Work, ws, "tree")
+				if err := os.MkdirAll(tree, 0o700); err != nil {
+					return nil, err
+				}
+				mod := "module reader\n\ngo 1.26.0\n\nrequire git.novox.be/novox/mesh-sdk/go " + sdkPin(t) + "\n"
+				if err := os.WriteFile(filepath.Join(tree, "go.mod"), []byte(mod), 0o600); err != nil {
+					return nil, err
+				}
+				return map[string]any{"workspace": ws}, os.WriteFile(filepath.Join(tree, "go.sum"), gosum, 0o600)
+			}
+		}
+	}
+	p := m.Puller(steps, &buildstep.JetStreamAsks{JS: js, Language: delivery.AskGo})
+	p.PullWait = 200 * time.Millisecond
+	go p.Pull(ctx)
+
+	ask := func() delivery.Step {
+		a := composeAskOf(t, digests[0])
+		a.Compose.Fetch["repository"], a.Compose.Dir = "novox/mesh-controller", delivery.RootPath
+		raw, err := delivery.EncodeStepAsk(a)
+		if err != nil {
+			t.Fatal(err)
+		}
+		subject, _ := delivery.AskSubject(delivery.AskGo, delivery.AskCheck)
+		if _, err := js.Publish(ctx, subject, raw); err != nil {
+			t.Fatal(err)
+		}
+		key, _ := delivery.AskStepKey("ace", a.ID)
+		for deadline := time.Now().Add(90 * time.Second); time.Now().Before(deadline); time.Sleep(50 * time.Millisecond) {
+			states.mu.Lock()
+			v := states.steps[key]
+			states.mu.Unlock()
+			if len(v) > 0 && v[len(v)-1].State != delivery.StepRunning {
+				return v[len(v)-1]
+			}
+		}
+		t.Fatalf("the compose ask %s never ended", a.ID)
+		return delivery.Step{}
+	}
+	for n, wantBuilt := range []bool{true, false} {
+		step := ask()
+		if step.State != delivery.StepPassed {
+			t.Fatalf("ask %d: %s: %s", n+1, step.State, step.Reason)
+		}
+		var ans delivery.ComposeAnswer
+		var v composer.Verdict
+		if err := json.Unmarshal(step.Result, &ans); err != nil {
+			t.Fatal(err)
+		}
+		if err := json.Unmarshal(ans.Verdict, &v); err != nil {
+			t.Fatal(err)
+		}
+		if ans.Built != wantBuilt || !strings.HasPrefix(ans.Key, "composer-") || len(v.Cases) != 1 || !v.Cases[0].Manifests["demo"].Accepted ||
+			!strings.Contains(v.SDK, sdkPin(t)) {
+			t.Fatalf("ask %d: answer built %v key %s, verdict %+v; want built %v and demo accepted by mesh-sdk %s", n+1, ans.Built, ans.Key, v, wantBuilt, sdkPin(t))
+		}
+	}
+	if fetches != 1 {
+		t.Errorf("two asks of one commit fetched %d times, want once", fetches)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/compose_test.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+	"git.novox.be/novox/mesh-sdk/go/composer"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+const composeCommit = "4444444444444444444444444444444444444444"
+
+// indexerHolds is the delivery indexer's manifests state holding each body under its digest, as the indexer writes it.
+func indexerHolds(t *testing.T, bodies ...string) (func(string) (json.RawMessage, error), []string) {
+	t.Helper()
+	kept, digests := map[string]json.RawMessage{}, []string{}
+	for _, b := range bodies {
+		d := delivery.ManifestDigest([]byte(b))
+		key, _ := delivery.ManifestsKey(d)
+		raw, err := delivery.EncodeManifest(delivery.Manifest{Module: "demo", JSON: b})
+		if err != nil {
+			t.Fatal(err)
+		}
+		kept[key], digests = raw, append(digests, d)
+	}
+	return func(key string) (json.RawMessage, error) { return kept[key], nil }, digests
+}
+
+func composeAskOf(t *testing.T, digest string) delivery.StepAsk {
+	t.Helper()
+	req, _ := json.Marshal(composer.Request{V: composer.Version, Cases: []composer.Case{{Name: "change",
+		Manifests: map[string]composer.Manifest{"demo": {Digest: digest}}}}})
+	return delivery.StepAsk{ID: buildstep.NewID(), Kind: delivery.AskCheck, Language: delivery.AskGo, Asker: "mesh-delivery-assigner",
+		At: time.Now(), Compose: &delivery.ComposeJob{Fetch: map[string]any{"repository": "novox/mesh-sdk", "commit": composeCommit},
+			Dir: "go", Package: composer.Package, Request: req}}
+}
+
+// composeModule is a module with work and cache directories of its own, running its commands as they are (Inside: a
+// unit test has no bubblewrap to shut them off in).
+func composeModule(t *testing.T) *Module {
+	t.Helper()
+	m := moduleWith(newStates(), "go1.26.0")
+	m.Work, m.Cache, m.Inside, m.Run = t.TempDir(), t.TempDir(), true, StepRunner(t.TempDir())
+	return m
+}
+
+// 1622/AC3: a composer kept under the ask's key is run again, nothing fetched or built: the answer says it was not
+// built, names the key, and carries the composer's verdict whole; the request it read had its manifests filled from the
+// indexer's state.
+func TestAKeptComposerIsRunWithTheManifestsFilled(t *testing.T) {
+	m := composeModule(t)
+	read, digests := indexerHolds(t, `{"module":"demo","version":"1"}`)
+	m.ReadManifest = read
+	a := composeAskOf(t, digests[0])
+	key := delivery.ComposerKey("novox/mesh-sdk", composeCommit, "go", composer.Package, delivery.ToolchainUsed{Version: "go1.26.0", Recipe: m.Recipe.Version()})
+	exe := m.composerPath(key)
+	if err := os.MkdirAll(filepath.Dir(exe), 0o700); err != nil {
+		t.Fatal(err)
+	}
+	// A composer that answers which manifests its request held, filled or not, as a verdict.
+	script := "#!/bin/sh\n" +
+		`if grep -q '"digest"' "$2"; then echo '{"v":1,"sdk":"stand-in","cases":[{"name":"unfilled","manifests":{}}]}'; ` +
+		`else echo '{"v":1,"sdk":"stand-in","cases":[{"name":"change","manifests":{"demo":{"accepted":true}}}]}'; fi` + "\n"
+	if err := os.WriteFile(exe, []byte(script), 0o700); err != nil {
+		t.Fatal(err)
+	}
+	fetched := 0
+	fetch := func(context.Context, map[string]any) (any, error) { fetched++; return nil, nil }
+	out, err := m.compose(context.Background(), fetch, a)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ans := out.(delivery.ComposeAnswer)
+	var v composer.Verdict
+	if err := json.Unmarshal(ans.Verdict, &v); err != nil {
+		t.Fatal(err)
+	}
+	if ans.Built || ans.Key != key || fetched != 0 || len(v.Cases) != 1 || v.Cases[0].Name != "change" || !v.Cases[0].Manifests["demo"].Accepted {
+		t.Fatalf("answer = %+v (fetched %d), verdict %+v", ans, fetched, v)
+	}
+	if entries, _ := os.ReadDir(m.Work); len(entries) != 0 {
+		t.Errorf("the run's workspace was left: %v", entries)
+	}
+}
+
+// 1622: a manifest the indexer does not keep fails the ask, naming its digest; a fetched commit with no go.mod where
+// the ask builds fails it naming the directory, and its workspace is released.
+func TestAComposeAskFailsLoudly(t *testing.T) {
+	m := composeModule(t)
+	m.ReadManifest, _ = indexerHolds(t)
+	a := composeAskOf(t, "feedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeedfeed")
+	key := delivery.ComposerKey("novox/mesh-sdk", composeCommit, "go", composer.Package, delivery.ToolchainUsed{Version: "go1.26.0", Recipe: m.Recipe.Version()})
+	os.MkdirAll(filepath.Dir(m.composerPath(key)), 0o700)
+	os.WriteFile(m.composerPath(key), []byte("#!/bin/sh\nexit 0\n"), 0o700)
+	if _, err := m.compose(context.Background(), nil, a); err == nil || !strings.Contains(err.Error(), "feedfeed") {
+		t.Errorf("an unkept manifest: %v", err)
+	}
+	m2 := composeModule(t)
+	fetch := func(context.Context, map[string]any) (any, error) {
+		if err := os.MkdirAll(filepath.Join(m2.Work, "ws0000000000a", "tree", "go"), 0o700); err != nil {
+			return nil, err
+		}
+		return map[string]any{"workspace": "ws0000000000a"}, nil
+	}
+	if _, err := m2.compose(context.Background(), fetch, composeAskOf(t, "x")); err == nil || !strings.Contains(err.Error(), "no go.mod in go") {
+		t.Errorf("a commit with no go.mod: %v", err)
+	}
+	if entries, _ := os.ReadDir(m2.Work); len(entries) != 0 {
+		t.Errorf("the fetched workspace was left: %v", entries)
+	}
+}
+
+// 1622: the module reads the delivery indexer's manifests, which a compose ask names by digest.
+func TestTheModuleReadsTheIndexersManifests(t *testing.T) {
+	if m := readManifest(t); !slices.Contains(m.Reads, ManifestsState) {
+		t.Errorf("reads = %v, lacks %s", m.Reads, ManifestsState)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/digest.go

@@ -7,6 +7,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
@@ -24,12 +25,20 @@ import (
 // 2: no Go version in the text; the toolchain enters a fingerprint as the agreed version (ADR 0477 §3). 3: the siblings'
 // commits (the lead's decision L5) and the integration level's tags integration,isolation (the checker's agreement).
 // 4: the siblings' commits enter only the digest of a package whose tests reach a file naming MESH_CHECK_BESIDE (ADR 0536 §1).
-const DigestVersion = "4"
+// 5: a catalogue module's non-Go files enter the digest of its packages (issue 1935).
+const DigestVersion = "5"
 
 // besideVariable is the name a file bears when it reads where the siblings lie; a package whose tests reach such a file
 // depends on the siblings' commits.
 const besideVariable = "MESH_CHECK_BESIDE"
 
+// ReadsOutsideMarker is the name of a file in a package's directory that says its tests read files outside it (a
+// repository's documents, a sibling directory): such a package is never kept (issue 1935). The digest hashes only what
+// the Go toolchain lists, so it cannot name what a test opens elsewhere; a marker file, beside the Go files where a
+// reader of the package sees it, is the plain way to say so until the checker keeps the files a test opened (the Go
+// test log) with each verdict.
+const ReadsOutsideMarker = "reads-outside"
+
 // integrationTags are the build tags of the integration level, its run and its digest alike: integration, and isolation
 // for the bubblewrap proofs (mesh-sdk's and the build modules'), which a build node can run.
 var integrationTags = []string{"integration", "isolation"}
@@ -89,6 +98,9 @@ type DigestResult struct {
 	// only when they are the siblings it gave the fetch.
 	Beside       []string `json:"beside,omitempty"`
 	WithoutTests []string `json:"without_tests,omitempty"`
+	// ReadsOutside names the packages that carry the marker: each has a digest that no kept verdict can have (a fresh
+	// random one), so the check runs it every time.
+	ReadsOutside []string `json:"reads_outside,omitempty"`
 	// JudgedBy is the program that ran the digest (ADR 0535 §5): "installed", or "candidate <merge commit>" under the
 	// runner workspace.
 	JudgedBy string `json:"judged_by,omitempty"`
@@ -199,6 +211,12 @@ func (m *Module) digestHere(ctx context.Context, workspace, level string) (Diges
 		}
 	}
 	sort.Strings(res.WithoutTests)
+	sort.Strings(res.ReadsOutside)
+	for _, p := range res.ReadsOutside {
+		if m.Say != nil {
+			m.Say("the %s level of %s always runs: its directory carries %s, so its tests read files outside it that no digest names", level, p, ReadsOutsideMarker)
+		}
+	}
 	return res, nil
 }
 
@@ -256,6 +274,17 @@ func digestModule(res *DigestResult, pkgs map[string]*goPackage, tree string, he
 		if testMain == nil {
 			return fmt.Errorf("go list gave no test binary for %s", path)
 		}
+		if _, err := os.Stat(filepath.Join(root.Dir, ReadsOutsideMarker)); err == nil {
+			// The digest of a package that reads outside itself is one nothing can have kept: the key is a fresh random
+			// hex, so the ask finds no kept verdict and runs it, and what the checker writes under it is never read again.
+			var nonce [32]byte
+			if _, err := rand.Read(nonce[:]); err != nil {
+				return err
+			}
+			res.Packages[path] = hex.EncodeToString(nonce[:])
+			res.ReadsOutside = append(res.ReadsOutside, path)
+			continue
+		}
 		d, err := packageDigest(root, testMain, pkgs, tree, header, beside)
 		if err != nil {
 			return fmt.Errorf("%s: %w", path, err)
@@ -303,6 +332,15 @@ func packageDigest(root, testMain *goPackage, pkgs map[string]*goPackage, tree s
 			}
 		}
 	}
+	// A catalogue module's tests read its manifest, its README and its files from the package's directory (../../module.json):
+	// every non-Go file of the module's directory is an input (issue 1935). The module is the nearest ancestor with a module.json.
+	if modDir := enclosingModule(tree, root.Dir); modDir != "" {
+		more, err := moduleFileLines(tree, root, modDir)
+		if err != nil {
+			return "", err
+		}
+		lines = append(lines, more...)
+	}
 	data := filepath.Join(root.Dir, "testdata")
 	if _, err := os.Stat(data); err == nil {
 		err := filepath.WalkDir(data, func(path string, e fs.DirEntry, err error) error {
@@ -328,6 +366,41 @@ func packageDigest(root, testMain *goPackage, pkgs map[string]*goPackage, tree s
 	return hex.EncodeToString(h.Sum(nil)), nil
 }
 
+// enclosingModule is the nearest ancestor of dir, inside tree, that holds a module.json, or "" when there is none.
+func enclosingModule(tree, dir string) string {
+	tree = filepath.Clean(tree)
+	for d := filepath.Clean(dir); d != tree && strings.HasPrefix(d, tree+string(filepath.Separator)); d = filepath.Dir(d) {
+		if st, err := os.Stat(filepath.Join(d, "module.json")); err == nil && !st.IsDir() {
+			return d
+		}
+	}
+	return ""
+}
+
+// moduleFileLines are the content lines of every file of a module's directory that is not Go source (Go source is the
+// packages' own, listed by go list), skipping .git and node_modules.
+func moduleFileLines(tree string, p *goPackage, modDir string) ([]string, error) {
+	var lines []string
+	err := filepath.WalkDir(modDir, func(path string, e fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if e.IsDir() {
+			if n := e.Name(); n == ".git" || n == "node_modules" {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+		if strings.HasSuffix(path, ".go") {
+			return nil
+		}
+		l, err := contentLine(tree, p, path)
+		lines = append(lines, l)
+		return err
+	})
+	return lines, err
+}
+
 func fileLine(tree string, p *goPackage, name string) (string, error) {
 	return contentLine(tree, p, filepath.Join(p.Dir, name))
 }

modules/mesh-build-go/cmd/mesh-build-go/digest_test.go

@@ -189,3 +189,71 @@ func TestAModuleOutsideTheTreeCountsByVersionAndChecksum(t *testing.T) {
 		t.Errorf("a new version left the digest as it was")
 	}
 }
+
+// Issue 1935: a package whose directory carries the reads-outside marker is never kept: its digest is one no kept verdict
+// can have (it differs on every call, though nothing changed), and the answer names it. A package without the marker
+// keeps its digest.
+func TestAPackageWithTheReadsOutsideMarkerIsNeverKept(t *testing.T) {
+	t.Parallel()
+	m, tree := digestFixture(t)
+	plain := digests(t, m, "unit")
+	if len(plain.ReadsOutside) != 0 {
+		t.Fatalf("a package carries the marker in the fixture: %v", plain.ReadsOutside)
+	}
+	edit(t, tree, "c/"+ReadsOutsideMarker, "the tests read ../docs\n")
+	first, second := digests(t, m, "unit"), digests(t, m, "unit")
+	c := "fixture/digest/c"
+	if len(first.Packages[c]) != 64 || first.Packages[c] == second.Packages[c] || first.Packages[c] == plain.Packages[c] {
+		t.Errorf("c carries the marker and its digest is stable: %s, %s, before %s", first.Packages[c], second.Packages[c], plain.Packages[c])
+	}
+	if strings.Join(first.ReadsOutside, ",") != c {
+		t.Errorf("the answer does not name the package that reads outside: %v", first.ReadsOutside)
+	}
+	a := "fixture/digest/a"
+	if first.Packages[a] != plain.Packages[a] || first.Packages[a] != second.Packages[a] {
+		t.Errorf("a has no marker and its digest moved: %s, %s, before %s", first.Packages[a], second.Packages[a], plain.Packages[a])
+	}
+}
+
+// Issue 1935: a catalogue module's packages read ../../module.json and the module's files: a change to them changes the
+// digest of the module's package, and a change to another module's files does not.
+func TestACatalogueModulesFilesChangeTheDigestOfItsPackagesOnly(t *testing.T) {
+	t.Parallel()
+	m, tree := digestFixture(t)
+	for _, mod := range []string{"mod1", "mod2"} {
+		dir := filepath.Join(tree, mod, "cmd", "p")
+		if err := os.MkdirAll(filepath.Join(tree, mod, "files"), 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			t.Fatal(err)
+		}
+		edit(t, tree, mod+"/module.json", `{"module":"`+mod+`"}`)
+		edit(t, tree, mod+"/README.md", "# "+mod+"\n")
+		edit(t, tree, mod+"/files/f.env", "A=1\n")
+		edit(t, tree, mod+"/cmd/p/p.go", "package p\n")
+		edit(t, tree, mod+"/cmd/p/p_test.go", "package p\n\nimport (\n\t\"os\"\n\t\"testing\"\n)\n\nfunc TestReads(t *testing.T) {\n\tif _, err := os.ReadFile(\"../../module.json\"); err != nil {\n\t\tt.Fatal(err)\n\t}\n}\n")
+	}
+	p1, p2 := "fixture/digest/mod1/cmd/p", "fixture/digest/mod2/cmd/p"
+	before := digests(t, m, "unit")
+	if len(before.Packages[p1]) != 64 || len(before.Packages[p2]) != 64 {
+		t.Fatalf("no digest for the module packages: %+v", before.Packages)
+	}
+	if before.Packages[p1] == before.Packages[p2] {
+		t.Errorf("two modules, one digest")
+	}
+	for _, file := range []string{"mod1/module.json", "mod1/README.md", "mod1/files/f.env"} {
+		edit(t, tree, file, "changed "+file+"\n")
+		after := digests(t, m, "unit")
+		if after.Packages[p1] == before.Packages[p1] {
+			t.Errorf("a change to %s did not change the module's digest", file)
+		}
+		if after.Packages[p2] != before.Packages[p2] {
+			t.Errorf("a change to %s changed the other module's digest", file)
+		}
+		before = after
+	}
+	if got := digests(t, m, "unit"); got.Packages["fixture/digest/c"] == "" {
+		t.Errorf("a package outside any module lost its digest")
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/failure_words_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"os"
 	"strings"
 	"testing"
@@ -27,7 +28,7 @@ func TestAFailedTestKeepsItsFatalMessageAfterItsLogLines(t *testing.T) {
 		}
 	}
 	if want := "3 subscription(s) derive to a subject no emitter owns:"; f.Cause != want && !strings.HasSuffix(f.Cause, want) {
-		t.Errorf("1901/AC2: cause = %q, want the t.Fatalf line, not the t.Logf line", f.Cause)
+		t.Errorf("1901/AC1: cause = %q, want the t.Fatalf line, not the t.Logf line", f.Cause)
 	}
 }
 
@@ -38,11 +39,74 @@ func TestAFailureLongerThanTheBoundKeepsItsLastLines(t *testing.T) {
 		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)")
-	out := clip(lines)
+	out := clip(lines, "")
 	if len(out) > outputBytes+100 {
 		t.Errorf("1901/AC1: kept %d bytes, bound is %d", len(out), outputBytes)
 	}
-	if !strings.HasSuffix(out, "the real cause\n--- FAIL: TestX (0.00s)") || !strings.HasPrefix(out, "... (") {
+	if !strings.HasSuffix(out, "the real cause\n--- FAIL: TestX (0.00s)") || !strings.Contains(out, "\n... (") {
 		t.Errorf("1901/AC1: out = %q...%q", out[:40], out[len(out)-60:])
 	}
 }
+
+// An older checker, which knows no "cause" field, still reads the new build module's answer, and the output it gets
+// holds at least what the older build module kept (its first lines, for an output shorter than the bound).
+func TestAnOlderCheckerReadsTheNewFailureAndGetsAtLeastWhatItKept(t *testing.T) { // 1901/AC3
+	raw, err := os.ReadFile("testdata/captured/go-test-json-log-then-fatal.jsonl")
+	if err != nil {
+		t.Fatal(err)
+	}
+	res := &TestResult{}
+	rd := newReader(res, ".")
+	rd.read(string(raw))
+	rd.finish()
+	b, err := json.Marshal(res.Failed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var old []struct {
+		Package string `json:"package"`
+		Test    string `json:"test,omitempty"`
+		Output  string `json:"output,omitempty"`
+	}
+	if err := json.Unmarshal(b, &old); err != nil || len(old) != 1 {
+		t.Fatalf("1901/AC3: an older checker refused the answer: %v, %d failures", err, len(old))
+	}
+	first := strings.SplitN(old[0].Output, "\n", 2)[0]
+	if first == "" || !strings.Contains(old[0].Output, "judged against") || !strings.Contains(old[0].Output, "3 subscription(s)") {
+		t.Errorf("1901/AC3: older checker's output = %q", old[0].Output)
+	}
+}
+
+// A long failure, whose earlier lines are left out, still starts with a real line for an older checker, which keeps only the
+// first non-empty line of the output cut to 120 characters, and not with the marker.
+func TestALongFailureStillStartsWithARealLineForAnOlderChecker(t *testing.T) { // 1901/AC3
+	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)
+		for _, l := range strings.Split(out, "\n") {
+			if l = strings.TrimSpace(l); l != "" {
+				if len(l) > 120 {
+					l = l[:120]
+				}
+				return l
+			}
+		}
+		return ""
+	}
+	for _, cause := range []string{"the real cause", ""} {
+		out := clip(lines, cause)
+		got := oldFirst(out)
+		if strings.HasPrefix(got, "... (") || got == "" {
+			t.Errorf("1901/AC3: cause %q: an older checker would read %q", cause, got)
+		}
+		if cause != "" && got != cause {
+			t.Errorf("1901/AC3: older checker reads %q, want the cause", got)
+		}
+		if !strings.HasSuffix(out, "--- FAIL: TestX (0.00s)") {
+			t.Errorf("1901/AC3: the last lines are lost: %q", out[len(out)-40:])
+		}
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/fetch.go

@@ -288,10 +288,14 @@ func inTestdata(path string) bool {
 // git, through the account's rewrite of the forge's address to ssh), and nothing that asks a question. For a directory
 // that vendors, see goEnvFor.
 func (m *Module) goEnv() []string {
+	modcache := filepath.Join(m.Cache, "gomod")
+	if m.GoModCache != "" {
+		modcache = m.GoModCache
+	}
 	return []string{
 		"GOTOOLCHAIN=local",
 		"GOFLAGS=-mod=mod",
-		"GOMODCACHE=" + filepath.Join(m.Cache, "gomod"),
+		"GOMODCACHE=" + modcache,
 		"GOCACHE=" + filepath.Join(m.Cache, "gobuild"),
 		"GOPRIVATE=git.novox.be",
 		"GIT_TERMINAL_PROMPT=0",

modules/mesh-build-go/cmd/mesh-build-go/levels.go

@@ -10,6 +10,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"regexp"
+	"slices"
 	"sort"
 	"strings"
 	"time"
@@ -52,6 +53,10 @@ type TestTime struct {
 // Failure is a test that failed, or a package that failed with no test to name (a build that failed, a TestMain that
 // panicked); Output is the last lines it wrote, up to outputBytes (issue 1901), and Cause the first line of what the
 // test reported as its error (t.Error, t.Fatal), without its file and line, when go test said which lines those were.
+// **A failure that is not one test's assertion carries its real cause too** (issue 1901, its third meeting): the
+// "panic:" line (a timeout's with the tests it found running), a "fatal error:" or "signal:" line, a build's first
+// error, or in words that the test program exited, while which tests ran or after its tests passed. Test then names the
+// tests that were running when the program stopped. A "PASS" or "ok" line is never a failure's words.
 type Failure struct {
 	Package string `json:"package"`
 	Test    string `json:"test,omitempty"`
@@ -126,11 +131,18 @@ type reader struct {
 	causes   map[string]string   // the first error line of a test, by the same key
 	times    []TestTime
 	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 (issue 1901).
+	running map[string][]string
+	// passed says a package's test program printed "PASS" (its tests passed) before it failed; built says its test
+	// program failed to build.
+	passed, built map[string]bool
 }
 
 func newReader(res *TestResult, dir string) *reader {
 	return &reader{res: res, dir: dir, pkgs: map[string]*PackageResult{}, builds: map[string][]string{},
-		pkgOut: map[string][]string{}, testOut: map[string][]string{}, causes: map[string]string{}, failedIn: map[string]bool{}}
+		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{}}
 }
 
 // read takes go test's output. Lines that are not events are kept for a failure that has nothing else to say.
@@ -178,12 +190,21 @@ func (r *reader) event(ev event) {
 		p := r.pkg(ev.Package)
 		switch ev.Action {
 		case "output":
-			r.pkgOut[ev.Package] = keep(r.pkgOut[ev.Package], ev.Output)
+			// go test's own summary of a package ("PASS", "FAIL", "ok <pkg>", "FAIL <pkg>") 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 summaryLine(l):
+			default:
+				r.pkgOut[ev.Package] = keep(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":
@@ -197,7 +218,10 @@ func (r *reader) event(ev event) {
 			if ev.OutputType == "error" && r.causes[key] == "" {
 				r.causes[key] = errorWords(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++
@@ -207,15 +231,24 @@ func (r *reader) event(ev event) {
 			r.times = append(r.times, TestTime{Package: ev.Package, Test: ev.Test, Elapsed: ev.Elapsed})
 			if ev.Action == "fail" {
 				r.failedIn[ev.Package] = true
-				r.res.Failed = append(r.res.Failed, Failure{Package: ev.Package, Test: ev.Test, Output: clip(r.testOut[key]), Cause: r.causes[key]})
+				cause := r.causes[key]
+				if race := raceCause(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 = causeOf(r.testOut[key])
+				}
+				r.res.Failed = append(r.res.Failed, Failure{Package: ev.Package, Test: ev.Test, Output: clip(r.testOut[key], cause), Cause: cause})
 			}
 		}
 	}
 }
 
 // clip joins the last lines of a failure's output that fit outputBytes, each cut to outputLineBytes, and says how many
-// earlier lines it left out.
-func clip(lines []string) string {
+// earlier lines it left out. **Its first line is the failure's cause** (issue 1901/AC3, AC4), put ahead when the kept
+// lines do not start with it, or, with no cause and lines left out, the first non-empty line of the output, then the
+// marker. An older checker takes only the first non-empty line of the output, and a marker there would be less than the
+// older pair kept.
+func clip(lines []string, cause string) string {
 	size, from := 0, len(lines)
 	for from > 0 {
 		n := len(cutLine(lines[from-1])) + 1
@@ -225,7 +258,14 @@ func clip(lines []string) string {
 		size += n
 		from--
 	}
-	kept := make([]string, 0, len(lines)-from+1)
+	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))
 	}
@@ -235,6 +275,159 @@ func clip(lines []string) string {
 	return strings.Join(kept, "\n")
 }
 
+// summaryLine 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>" (review round 1: a line of the package's own that starts "ok " is kept).
+func summaryLine(l string) bool {
+	return l == "PASS" || l == "FAIL" || strings.HasPrefix(l, "ok  \t") || strings.HasPrefix(l, "FAIL\t")
+}
+
+// causeOf is the cause in a failure's output that is not a test's assertion (issue 1901): a race the race detector
+// reported (raceCause); else the first "panic:" line, a timeout's with the tests it names as running; else the first
+// "fatal error:" (the runtime's) or "signal:" line (a test program killed); "" when there is none. It reads every line,
+// so a long goroutine dump after the panic 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 (review round 1).
+func causeOf(lines []string) string {
+	if race := raceCause(lines); race != "" {
+		return race
+	}
+	for _, prefix := range []string{"panic: ", "fatal error: ", "signal: "} {
+		for i, l := range lines {
+			l = strings.TrimRight(l, "\r\n") // at column 0: an indented line is a test's own log, not the runtime's
+			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 ""
+}
+
+// raceCause is the first race the race detector reported in a failure's output, in one line (issue 1901: a race after
+// the tests' "PASS" was worded "PASS"): its access and the frame that made it, and where the goroutine that made it was
+// created, as "WARNING: DATA RACE: Write at 0x... by goroutine 10 in pkg.F.func1() (f_test.go:13); goroutine created at
+// pkg.F() (f_test.go:13)". "" when the output holds no race.
+func raceCause(lines []string) string {
+	at := -1
+	for i, l := range lines {
+		if strings.TrimRight(l, "\r\n") == "WARNING: DATA RACE" { // at column 0, as causeOf
+			at = i
+			break
+		}
+	}
+	if at < 0 {
+		return ""
+	}
+	// frame is the function and the file's base name and line that follow a heading line at i.
+	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)
+}
+
+// buildCause is the first error line of a failed build: the first line that is not go's "# <package>" heading.
+func buildCause(lines []string) string {
+	for _, l := range lines {
+		if l = strings.TrimSpace(l); l != "" && !strings.HasPrefix(l, "# ") {
+			return cutLine(l)
+		}
+	}
+	return ""
+}
+
+// testNames names the tests that were running, at most three, and how many more.
+func testNames(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 (issue 1901): its test program did not build,
+// panicked, timed out, was killed or exited. It names the tests that were running when the program stopped, keeps
+// their output with the package's, and says the cause.
+func (r *reader) 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 := causeOf(lines)
+	switch {
+	case cause != "":
+	case r.built[name]:
+		cause = buildCause(lines)
+	case len(running) > 0:
+		cause = "the test program exited while " + testNames(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: testNames(running), Output: clip(lines, cause), Cause: cause}
+}
+
 // cutLine cuts a line to outputLineBytes, on a character boundary.
 func cutLine(l string) string {
 	if len(l) <= outputLineBytes {
@@ -256,7 +449,7 @@ func (r *reader) finish() {
 	for _, name := range r.order {
 		p := r.pkgs[name]
 		if !p.Passed && !r.failedIn[name] {
-			r.res.Failed = append(r.res.Failed, Failure{Package: name, Output: clip(r.pkgOut[name])})
+			r.res.Failed = append(r.res.Failed, r.packageFailure(name))
 		}
 		if !p.NoTests && p.Elapsed > r.res.Elapsed {
 			r.res.Elapsed = p.Elapsed

modules/mesh-build-go/cmd/mesh-build-go/lint.go

@@ -12,6 +12,7 @@ import (
 	"regexp"
 	"sort"
 	"strings"
+	"sync"
 
 	"git.novox.be/novox/mesh-sdk/go/forgekey"
 )
@@ -127,3 +128,45 @@ func (m *Module) lint(ctx context.Context, run forgekey.Runner, tree, d string,
 	}
 	return failed, nil
 }
+
+// lintAll lints each directory, up to m.parallel() at once like the level's tests; the failures join in directory order
+// and the error is the first directory's, so the answer does not depend on which ended first (issue 1930).
+func (m *Module) lintAll(ctx context.Context, run forgekey.Runner, tree string, dirs []string, env func(d string) []string) ([]Failure, error) {
+	type answer struct {
+		failed []Failure
+		err    error
+	}
+	answers := make([]answer, len(dirs))
+	slots := make(chan struct{}, m.parallel())
+	var wg sync.WaitGroup
+	var crash any // a panic of a lint goes on in the caller, as a panic of a test run does
+	var crashMu sync.Mutex
+	for i, d := range dirs {
+		wg.Add(1)
+		slots <- struct{}{}
+		go func() {
+			defer wg.Done()
+			defer func() { <-slots }()
+			defer func() {
+				if p := recover(); p != nil {
+					crashMu.Lock()
+					crash = p
+					crashMu.Unlock()
+				}
+			}()
+			answers[i].failed, answers[i].err = m.lint(ctx, run, tree, d, env(d))
+		}()
+	}
+	wg.Wait()
+	if crash != nil {
+		panic(crash)
+	}
+	var failed []Failure
+	for _, a := range answers {
+		if a.err != nil {
+			return nil, a.err
+		}
+		failed = append(failed, a.failed...)
+	}
+	return failed, nil
+}

modules/mesh-build-go/cmd/mesh-build-go/lint_test.go

@@ -5,7 +5,9 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"testing"
+	"time"
 
 	"git.novox.be/novox/mesh-sdk/go/forgekey"
 )
@@ -90,3 +92,43 @@ func TestAnUnformattedFileFailsTheUnitLevel(t *testing.T) {
 		}
 	}
 }
+
+// Issue 1930: the lint of many directories runs side by side up to the level's bound, not one after another, and the
+// failures still join in directory order.
+func TestTheLintOfManyDirectoriesRunsAtOnceUpToTheBound(t *testing.T) {
+	files := map[string]string{}
+	var dirs []string
+	for _, d := range []string{"a", "b", "c", "d", "e", "f"} {
+		files[d+"/go.mod"] = "module x/" + d + "\n"
+		files[d+"/x.go"] = "package x\n"
+		dirs = append(dirs, d)
+	}
+	tree := writeTree(t, files)
+	var mu sync.Mutex
+	running, most := 0, 0
+	run := func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		mu.Lock()
+		running++
+		most = max(most, running)
+		mu.Unlock()
+		time.Sleep(30 * time.Millisecond)
+		mu.Lock()
+		running--
+		mu.Unlock()
+		if strings.HasSuffix(args[1], "b") || strings.HasSuffix(args[1], "e") {
+			return forgekey.Ran{Status: 1, Stderr: "bad " + filepath.Base(args[1])}
+		}
+		return forgekey.Ran{}
+	}
+	m := &Module{Parallel: 3}
+	failed, err := m.lintAll(context.Background(), run, tree, dirs, func(string) []string { return nil })
+	if err != nil {
+		t.Fatal(err)
+	}
+	if most < 2 || most > 3 {
+		t.Errorf("%d lint commands ran at once, want 2 or 3 (the bound)", most)
+	}
+	if len(failed) != 2 || failed[0].Package != "b" || failed[1].Package != "e" {
+		t.Errorf("failed = %+v, want b's then e's", failed)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/main.go

@@ -40,6 +40,8 @@ func main() {
 		Emit:                func(t string, b any) error { return stdio.Emit(t, b) },
 		Steps:               stdio.State(delivery.StepsState).Put,
 		ReadSteps:           readOf(stdio.State(delivery.StepsState)),
+		Pauses:              stdio.State(delivery.PausesState).Put,
+		ReadPauses:          readOf(stdio.State(delivery.PausesState)),
 		ReadToolchainsState: readOf(stdio.State(delivery.ToolchainsState)),
 		Ctx:                 ctx,
 		Say:                 logf,
@@ -54,6 +56,7 @@ func main() {
 	m.RegistryFile = m.Home + "/registry"
 	m.Settings = m.Home + "/settings.json"
 	m.ReadKept = readOf(stdio.State(KeptState)).Get
+	m.ReadManifest = readOf(stdio.State(ManifestsState)).Get
 	m.Probe = ProbeGo(m.Home, m.Cache)
 	m.Bubblewrap = ProbeBubblewrap
 	// Outside a launch by the runtime — a build, a check — there is no node and no state to write.

modules/mesh-build-go/cmd/mesh-build-go/manifest_test.go

@@ -92,9 +92,13 @@ func TestManifestKeepsItsStatesClaimsItsBuildSeatAndDeclaresItsHealthTool(t *tes
 	states := []string{}
 	for _, s := range m.State {
 		states = append(states, s.Name)
+		// A step's key is per step and dropped after its age, so the bucket cannot fill; a pause has no age.
+		if (s.Name == "steps") != (s.TTLSeconds > 0) {
+			t.Errorf("state %s has ttl-seconds %d: only steps has an age", s.Name, s.TTLSeconds)
+		}
 	}
 	slices.Sort(states)
-	if want := []string{"keys", "steps", "toolchains"}; !slices.Equal(states, want) {
+	if want := []string{"keys", "pauses", "steps", "toolchains"}; !slices.Equal(states, want) {
 		t.Errorf("state = %v, want %v", states, want)
 	}
 	if len(m.Claims) != 1 || m.Claims[0].Name != Seat {

modules/mesh-build-go/cmd/mesh-build-go/module.go

@@ -29,6 +29,9 @@ type Module struct {
 	Toolchains, Steps buildstep.Put
 	// ReadSteps and ReadToolchainsState read those two states back for the read tools (issue 1562).
 	ReadSteps, ReadToolchainsState StateRead
+	// Pauses is the Put of the pauses state, which keeps the node's pause key without an age; ReadPauses reads it back.
+	Pauses     buildstep.Put
+	ReadPauses StateRead
 	// Emit tells the bus an event (stdio.Emit); nil emits nothing. The guard emits toolchain.reported after each write of
 	// the toolchains key, so the indexer, which holds no timer, learns that the bucket exists (issue 1444).
 	Emit func(eventType string, body any) error
@@ -82,6 +85,10 @@ type Module struct {
 	Settings string
 	Capacity func() int
 	ReadKept func(key string) (json.RawMessage, error)
+	// ReadManifest reads a key of the delivery indexer's manifests state (ManifestsState), which a compose ask's request
+	// names its manifests by (compose.go); GoModCache, when set, is the Go module cache in place of Cache's (a test).
+	ReadManifest func(key string) (json.RawMessage, error)
+	GoModCache   string
 
 	spacesOnce sync.Once
 	workspaces *buildstep.Workspaces

modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+// A failure that is not one test's assertion carries its real cause (issue 1901, its third meeting: a try of
+// mesh-controller kept only "PASS" for a package that stopped half-way). Each fixture is the real `go test -json` of a
+// throwaway package (testdata/captured/README).
+func TestAFailureThatIsNotAnAssertionCarriesItsRealCause(t *testing.T) { // 1901/AC4
+	cases := []struct {
+		fixture string
+		test    string   // the test the failure names; "" for none
+		cause   []string // what the cause holds
+	}{
+		{"panicking", "TestPanics", []string{"panic: assignment to entry in nil map"}},
+		{"timeout", "TestWaitsForever", []string{"panic: test timed out after 2s", "TestWaitsForever"}},
+		{"deeptimeout", "TestHoldsTheSeat, TestWaitsForTheBus", []string{"panic: test timed out after 2s", "TestHoldsTheSeat", "TestWaitsForTheBus"}},
+		{"buildfail", "", []string{`cannot use "seat" (untyped string constant) as int value`}},
+		{"exiting", "TestExits", []string{"exited", "TestExits"}},
+		{"killed", "TestKilled", []string{"signal: killed"}},
+		{"passthenfail", "", []string{"panic: the bus closed after the tests: nats: connection closed"}},
+		{"mainexit", "", []string{"passed", "exited"}},
+		{"race", "TestRacesOnTheSeat", []string{"DATA RACE", "Write at", "example.com/race.TestRacesOnTheSeat.func1()", "p_test.go:13", "created at example.com/race.TestRacesOnTheSeat()"}},
+		{"racemain", "", []string{"DATA RACE", "Write at", "example.com/racemain.TestMain.func1()", "p_test.go:15", "created at example.com/racemain.TestMain()"}},
+	}
+	for _, c := range cases {
+		t.Run(c.fixture, func(t *testing.T) {
+			raw, err := os.ReadFile("testdata/captured/go-test-json-pkg-" + c.fixture + ".jsonl")
+			if err != nil {
+				t.Fatal(err)
+			}
+			res := &TestResult{}
+			rd := newReader(res, ".")
+			rd.read(string(raw))
+			rd.finish()
+			if len(res.Failed) != 1 {
+				t.Fatalf("failures = %+v, want one", res.Failed)
+			}
+			f := res.Failed[0]
+			if f.Test != c.test {
+				t.Errorf("1901/AC4: the failure names test %q, want %q", f.Test, c.test)
+			}
+			for _, want := range c.cause {
+				if !strings.Contains(f.Cause, want) {
+					t.Errorf("1901/AC4: cause = %q, want it to hold %q", f.Cause, want)
+				}
+			}
+			if len(f.Cause) > outputLineBytes+3 {
+				t.Errorf("1901/AC4: cause holds %d bytes, over the line bound %d", len(f.Cause), outputLineBytes)
+			}
+			// Never a "PASS" or "ok" line as a failure's words, and the first line of the output, all an older
+			// checker reads, is the cause.
+			for _, l := range strings.Split(f.Output, "\n") {
+				if l = strings.TrimSpace(l); l == "PASS" || strings.HasPrefix(l, "ok ") || strings.HasPrefix(l, "ok\t") {
+					t.Errorf("1901/AC4: the output keeps the line %q: %q", l, f.Output)
+				}
+			}
+			if first := strings.SplitN(f.Output, "\n", 2)[0]; strings.TrimSpace(first) != strings.TrimSpace(f.Cause) {
+				t.Errorf("1901/AC4: the output starts with %q, want the cause %q", first, f.Cause)
+			}
+		})
+	}
+}
+
+// A package that passes, and a test that fails on its own assertion, keep what they had: no cause is made up for them.
+func TestAnAssertionKeepsItsOwnCause(t *testing.T) { // 1901/AC4
+	raw, err := os.ReadFile("testdata/captured/go-test-json-log-then-fatal.jsonl")
+	if err != nil {
+		t.Fatal(err)
+	}
+	res := &TestResult{}
+	rd := newReader(res, ".")
+	rd.read(string(raw))
+	rd.finish()
+	if len(res.Failed) != 1 || !strings.HasSuffix(res.Failed[0].Cause, "3 subscription(s) derive to a subject no emitter owns:") {
+		t.Errorf("1901/AC4: failures = %+v", res.Failed)
+	}
+}
+
+// go prints the runtime's lines ("panic:", "fatal error:", "signal:", "WARNING: DATA RACE") at column 0: a test's own
+// log line that holds the same words is indented, and is not the cause (review round 1). The fixture is the deeptimeout
+// capture with two log lines of the first running test added: a t.Logf and its indented continuation saying "panic:".
+func TestALoggedPanicIsNotTheCause(t *testing.T) { // 1901/AC4
+	raw, err := os.ReadFile("testdata/captured/go-test-json-pkg-deeptimeout.jsonl")
+	if err != nil {
+		t.Fatal(err)
+	}
+	lines := strings.SplitAfter(string(raw), "\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"
+	out := strings.Join(lines[:10], "") + added + strings.Join(lines[10:], "")
+	res := &TestResult{}
+	rd := newReader(res, ".")
+	rd.read(out)
+	rd.finish()
+	if len(res.Failed) != 1 || !strings.HasPrefix(res.Failed[0].Cause, "panic: test timed out after 2s") {
+		t.Errorf("1901/AC4: failures = %+v, want the timeout's panic as the cause", res.Failed)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/packages_shape_test.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"context"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/buildstep"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// 1925/AC1: packagesArg takes the list as the bus's JSON shape ([]any) and as the typed list an ask hands in process
+// ([]string), and refuses a bad element in either.
+func TestPackagesArgTakesBothShapes(t *testing.T) {
+	cases := []struct {
+		name    string
+		in      any
+		want    []string
+		refused bool
+	}{
+		{"absent", nil, nil, false},
+		{"typed", []string{"x/a", "x/b/..."}, []string{"x/a", "x/b/..."}, false},
+		{"json", []any{"x/a", "x/b/..."}, []string{"x/a", "x/b/..."}, false},
+		{"typed empty", []string{}, []string{}, false},
+		{"typed dotdot", []string{"x/../y"}, nil, true},
+		{"json dotdot", []any{"x/../y"}, nil, true},
+		{"typed bad", []string{"x a"}, nil, true},
+		{"json bad", []any{"x a"}, nil, true},
+		{"json not a string", []any{3}, nil, true},
+		{"a string", "x/a", nil, true},
+	}
+	for _, c := range cases {
+		got, err := packagesArg(c.in)
+		if c.refused != (err != nil) {
+			t.Errorf("%s: err = %v, refused want %v", c.name, err, c.refused)
+			continue
+		}
+		if !c.refused && !reflect.DeepEqual(got, c.want) {
+			t.Errorf("%s: got %#v, want %#v", c.name, got, c.want)
+		}
+	}
+}
+
+// 1925/AC2: a check ask through the module's real build_go_test body gets past the packages argument: the digest names
+// a package, buildstep.RunAsk hands it in as a typed list, and the step fails only later, on the workspace nobody fetched.
+func TestACheckAskReachesTheTestStepPastItsPackages(t *testing.T) {
+	m := &Module{Node: "ace", Work: t.TempDir()}
+	var calls []string
+	steps := fakeSteps(&calls)
+	for i := range steps {
+		switch steps[i].Name {
+		case "build_go_digest":
+			steps[i].Run = func(ctx context.Context, args map[string]any) (any, error) {
+				return map[string]any{"level": "unit", "packages": map[string]string{"x/a": "d1"}}, nil
+			}
+		case "build_go_test":
+			for _, real := range m.StepTools() {
+				if real.Name == "build_go_test" {
+					steps[i].Run = real.Run
+				}
+			}
+		}
+	}
+	a := delivery.StepAsk{ID: buildstep.NewID(), Kind: delivery.AskCheck, Language: delivery.AskGo, Asker: "mesh-delivery-checker",
+		At: time.Now(), Check: &delivery.CheckJob{Fetch: map[string]any{"repository": "novox/x", "commit": askCommit}, Levels: []string{delivery.LevelUnit}}}
+	out, err := buildstep.RunAsk(context.Background(), m.askSteps(steps), a)
+	got := ""
+	if err != nil {
+		got = err.Error()
+	}
+	if strings.Contains(got, "packages is a list") {
+		t.Fatalf("the test step refused the ask's packages: %s", got)
+	}
+	if !strings.Contains(got, "no workspace") {
+		t.Fatalf("want the step to fail on the unfetched workspace, past its packages; err=%v out=%+v", err, out)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/read.go

@@ -7,9 +7,12 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"sort"
 	"strconv"
 	"strings"
+	"sync"
+	"time"
 
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
@@ -39,6 +42,53 @@ func readOf(s stdio.KeptState) StateRead {
 	}}
 }
 
+// MaxStateReads is the most values one read tool reads from a state in a call, and stateReadParallel how many of them
+// are in flight at once. Every value is a round trip from the tool through the runtime to the bus, so a call that read
+// every key of a large state one after the other outlasted the call's 30 s (issue 1827: 1164 keys, 20 MB).
+const (
+	MaxStateReads     = 1000
+	stateReadParallel = 16
+)
+
+// readValues reads the values of keys, stateReadParallel at a time, in the order of keys (nil for a key with none). It
+// stops starting reads after the first error and returns it.
+func readValues(keys []string, get func(string) (json.RawMessage, error)) ([]json.RawMessage, error) {
+	out := make([]json.RawMessage, len(keys))
+	var (
+		wg   sync.WaitGroup
+		mu   sync.Mutex
+		fail error
+		next = make(chan int)
+	)
+	for w := 0; w < stateReadParallel && w < len(keys); w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for i := range next {
+				raw, err := get(keys[i])
+				mu.Lock()
+				if err != nil && fail == nil {
+					fail = err
+				}
+				mu.Unlock()
+				out[i] = raw
+			}
+		}()
+	}
+	for i := range keys {
+		mu.Lock()
+		stop := fail != nil
+		mu.Unlock()
+		if stop {
+			break
+		}
+		next <- i
+	}
+	close(next)
+	wg.Wait()
+	return out, fail
+}
+
 // stepKey is the key of a step of this node: the id alone, or the whole key <node>.<id> as a step tool answered it.
 func (m *Module) stepKey(id string) (string, error) {
 	id = strings.TrimSpace(id)
@@ -80,27 +130,41 @@ type StepLine struct {
 	Reason  string `json:"reason,omitempty"`
 }
 
-// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero).
-func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
+// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero). Only
+// the node's own keys (<node>.) are listed and the newest max(limit*4, 100) of them read (at most MaxStateReads): a step's
+// id is base-36 milliseconds and random digits, so its string order is its start order. cut says older steps were not
+// read. The values still order the lines, since an ask step's id carries the ask time.
+func (m *Module) RecentSteps(limit int) (lines []StepLine, cut bool, err error) {
 	if limit <= 0 {
 		limit = 10
 	}
 	if m.ReadSteps.Keys == nil || m.ReadSteps.Get == nil {
-		return nil, fmt.Errorf("the steps state cannot be read here")
+		return nil, false, fmt.Errorf("the steps state cannot be read here")
 	}
+	start := time.Now()
 	keys, err := m.ReadSteps.Keys()
 	if err != nil {
-		return nil, err
+		return nil, false, err
+	}
+	own := keys[:0:0]
+	for _, k := range keys {
+		if strings.HasPrefix(k, m.Node+".") {
+			if node, _, err := delivery.ParseStepKey(k); err == nil && node == m.Node {
+				own = append(own, k)
+			}
+		}
+	}
+	sort.Sort(sort.Reverse(sort.StringSlice(own)))
+	if n := min(max(limit*4, 100), MaxStateReads); len(own) > n {
+		own, cut = own[:n], true
+	}
+	raws, err := readValues(own, m.ReadSteps.Get)
+	log.Printf("steps read: %d of %d keys listed read in %v (cut %v)", len(own), len(keys), time.Since(start).Round(time.Millisecond), cut)
+	if err != nil {
+		return nil, cut, err
 	}
 	var steps []delivery.Step
-	for _, k := range keys {
-		if node, _, err := delivery.ParseStepKey(k); err != nil || node != m.Node {
-			continue
-		}
-		raw, err := m.ReadSteps.Get(k)
-		if err != nil {
-			return nil, err
-		}
+	for _, raw := range raws {
 		if len(raw) == 0 {
 			continue
 		}
@@ -122,7 +186,7 @@ func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
 		}
 		out = append(out, l)
 	}
-	return out, nil
+	return out, cut, nil
 }
 
 // ReadToolchains is every key of the toolchains state (<node>.<language>) with its stored value.
@@ -130,24 +194,30 @@ func (m *Module) ReadToolchains() (map[string]delivery.Toolchain, error) {
 	if m.ReadToolchainsState.Keys == nil || m.ReadToolchainsState.Get == nil {
 		return nil, fmt.Errorf("the toolchains state cannot be read here")
 	}
+	start := time.Now()
 	keys, err := m.ReadToolchainsState.Keys()
 	if err != nil {
 		return nil, err
 	}
+	cut := len(keys) > MaxStateReads
+	if cut {
+		keys = keys[:MaxStateReads] // a node has a key per language: far fewer in practice
+	}
+	raws, err := readValues(keys, m.ReadToolchainsState.Get)
+	log.Printf("toolchains read: %d keys read in %v (cut %v: keys past %d were not read)", len(keys), time.Since(start).Round(time.Millisecond), cut, MaxStateReads)
+	if err != nil {
+		return nil, err
+	}
 	out := map[string]delivery.Toolchain{}
-	for _, k := range keys {
-		raw, err := m.ReadToolchainsState.Get(k)
-		if err != nil {
-			return nil, err
-		}
+	for i, raw := range raws {
 		if len(raw) == 0 {
 			continue
 		}
 		t, err := delivery.DecodeToolchain(raw)
 		if err != nil {
-			return nil, fmt.Errorf("%s: %w", k, err)
+			return nil, fmt.Errorf("%s: %w", keys[i], err)
 		}
-		out[k] = t
+		out[keys[i]] = t
 	}
 	return out, nil
 }
@@ -171,8 +241,13 @@ func (m *Module) ReadTools() []stdio.Tool {
 			Input: map[string]any{"type": "object", "properties": map[string]any{
 				"limit": map[string]any{"type": "integer", "description": "how many, at most; 10 when left out"}}},
 			Run: func(args map[string]any) (any, error) {
-				steps, err := m.RecentSteps(intArg(args["limit"]))
-				return map[string]any{"node": m.Node, "steps": steps}, err
+				steps, cut, err := m.RecentSteps(intArg(args["limit"]))
+				ans := map[string]any{"node": m.Node, "steps": steps}
+				if cut {
+					ans["cut"] = true
+					ans["note"] = fmt.Sprintf("this node has more steps stored than one call reads; older steps were not read (ask for a larger limit, at most %d reads)", MaxStateReads)
+				}
+				return ans, err
 			}},
 		{Name: ToolchainsReadTool,
 			Description: "What the module's toolchains state holds: each key <node>.<language> with the version installed, the " +

modules/mesh-build-go/cmd/mesh-build-go/read_test.go

@@ -3,8 +3,10 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"slices"
 	"strings"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -145,3 +147,62 @@ func TestReadToolsAreInTheManifestAndNeedNoToolchain(t *testing.T) {
 		t.Errorf("the read refused: %v", err)
 	}
 }
+
+// 1827: on the live shape (4 nodes, 600 steps each; a steps state of 1164 keys / 20 MB timed out at 30 s) the steps tool
+// lists, then reads only this node's keys, in parallel, at most MaxStateReads of them, and says when it cut.
+func TestRecentStepsReadsOnlyTheNodesKeysInParallelAndBounded(t *testing.T) {
+	t0 := time.Date(2026, 10, 25, 9, 0, 0, 0, time.UTC)
+	for _, row := range []struct {
+		perNode, limit int
+		reads          int64
+		steps          int
+		cut            bool
+	}{
+		{20, 0, 20, 10, false},
+		{600, 0, 100, 10, true},
+		{1500, 300, MaxStateReads, 300, true},
+	} {
+		var reads, inFlight, maxFlight atomic.Int64
+		stored := map[string][]byte{}
+		for _, n := range []string{"ace", "g14", "novox", "shanks"} {
+			for i := 0; i < row.perNode; i++ {
+				b, _ := delivery.EncodeStep(delivery.Step{ID: fmt.Sprintf("s%04d", i), Tool: "t", Node: n, State: delivery.StepPassed, Started: t0.Add(time.Duration(i) * time.Second)})
+				stored[n+".s"+fmt.Sprintf("%04d", i)] = b
+			}
+		}
+		m := &Module{Node: "shanks"}
+		m.ReadSteps = StateRead{
+			Keys: func() ([]string, error) {
+				var k []string
+				for key := range stored {
+					k = append(k, key)
+				}
+				return k, nil
+			},
+			Get: func(key string) (json.RawMessage, error) {
+				reads.Add(1)
+				now := inFlight.Add(1)
+				for o := maxFlight.Load(); now > o && !maxFlight.CompareAndSwap(o, now); o = maxFlight.Load() {
+				}
+				time.Sleep(time.Millisecond)
+				inFlight.Add(-1)
+				if !strings.HasPrefix(key, "shanks.") {
+					t.Errorf("read %s, a key of another node", key)
+				}
+				return stored[key], nil
+			},
+		}
+		start := time.Now()
+		lines, cut, err := m.RecentSteps(row.limit)
+		if err != nil || len(lines) != row.steps || cut != row.cut || reads.Load() != row.reads {
+			t.Errorf("%d a node: %d steps, cut %v, %d reads, err %v; want %d, %v, %d", row.perNode, len(lines), cut, reads.Load(), err, row.steps, row.cut, row.reads)
+		}
+		if row.cut && len(lines) > 0 && lines[0].ID != fmt.Sprintf("s%04d", row.perNode-1) {
+			t.Errorf("%d a node: newest answered %s", row.perNode, lines[0].ID)
+		}
+		if maxFlight.Load() < 2 {
+			t.Errorf("%d a node: values read one at a time", row.perNode)
+		}
+		t.Logf("%d a node: %d reads in %v (one after the other: %v)", row.perNode, reads.Load(), time.Since(start), time.Duration(reads.Load())*time.Millisecond)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/reads-outside

@@ -0,0 +1 @@
+These tests read other catalogue modules' files, outside this module (issue 1935): never kept.

modules/mesh-build-go/cmd/mesh-build-go/test.go

@@ -127,17 +127,25 @@ func (m *Module) besideEnv(workspace string) []string {
 	return []string{"MESH_CHECK_BESIDE=" + dir}
 }
 
+// packagesArg reads the packages argument: a list of package patterns, as []any when it came over the bus as JSON and
+// as []string when an ask handed it in process (issue 1925).
 func packagesArg(v any) ([]string, error) {
-	if v == nil {
+	var list []string
+	switch t := v.(type) {
+	case nil:
 		return nil, nil
-	}
-	list, ok := v.([]any)
-	if !ok {
+	case []string:
+		list = t
+	case []any:
+		for _, e := range t {
+			s, _ := e.(string)
+			list = append(list, s)
+		}
+	default:
 		return nil, fmt.Errorf("packages is a list of package patterns")
 	}
 	out := []string{}
-	for _, e := range list {
-		s, _ := e.(string)
+	for _, s := range list {
 		if !packageOK.MatchString(s) || strings.Contains(strings.TrimSuffix(s, "/..."), "..") {
 			return nil, fmt.Errorf("%q is not a package pattern", s)
 		}
@@ -201,13 +209,11 @@ func (m *Module) runLevel(ctx context.Context, tree string, o levelOpts) (*TestR
 		// gofmt and go vet of each directory the level runs come before its tests (ADR 0529 §1; issue 1887 D7-go): a
 		// directory that fails them fails the level at once, and their time is the result's Lint.
 		linted := m.clock()
-		var failed []Failure
-		for _, d := range todo {
-			f, err := m.lint(ctx, run, tree, d, append(m.goEnvFor(filepath.Join(tree, d)), o.env...))
-			if err != nil {
-				return nil, err
-			}
-			failed = append(failed, f...)
+		failed, err := m.lintAll(ctx, run, tree, todo, func(d string) []string {
+			return append(m.goEnvFor(filepath.Join(tree, d)), o.env...)
+		})
+		if err != nil {
+			return nil, err
 		}
 		res.Lint = m.clock().Sub(linted).Seconds()
 		if len(failed) > 0 {

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/README

@@ -24,3 +24,15 @@ The tar streams (the archives gunzipped) of the three archives above, captured t
 gunzip and sha256) at origin/main 0205b8f7 on 2026-10-21: directory f8af1d94...d1b6, within 294e2bec...07fb, file
 055cffc2...428e. The digests above hold the gzip bytes of go1.27.1. The first try of issue 1589 on the merge check's build node answered
 other digests; the tests therefore compare the stream always and the digest only under go1.27.1.
+
+go-test-json-pkg-*.jsonl are the standard output and error of `go test -json -count=1 ./...` (go1.27.3, the timeouts with
+`-timeout 2s`), captured on 2026-10-25 for issue 1901 in throwaway one-file modules that each fail 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) and mainexit (TestMain exits 2 after m.Run passed: go test
+prints "PASS" and then "FAIL <pkg>").
+go-test-json-pkg-race.jsonl and go-test-json-pkg-racemain.jsonl are the same, with `go test -race -json -count=1 ./...`
+(CGO_ENABLED=1, go1.27.3, 2026-10-25, issue 1901): race (TestRacesOnTheSeat writes a package variable from itself and a
+goroutine) and racemain (TestMain does so after m.Run passed: go test prints "PASS", then the race report and "Found 1
+data race(s)", then "FAIL <pkg>").

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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]"}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-deeptimeout.jsonl

@@ -0,0 +1,417 @@
+{"Time":"2026-10-25T15:35:18.991630993+01:00","Action":"start","Package":"example.com/deeptimeout"}
+{"Time":"2026-10-25T15:35:18.993895188+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.993963909+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== RUN   TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99399484+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== PAUSE TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.9939982+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.99400173+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.99400456+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== RUN   TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99400838+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== PAUSE TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.99401133+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.99401441+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
+{"Time":"2026-10-25T15:35:18.99401704+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== CONT  TestHoldsTheSeat\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:18.994074141+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
+{"Time":"2026-10-25T15:35:18.994102612+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== CONT  TestWaitsForTheBus\n","OutputType":"frame"}
+{"Time":"2026-10-25T15:35:21.00935195+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"panic: test timed out after 2s\n"}
+{"Time":"2026-10-25T15:35:21.00938383+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\trunning tests:\n"}
+{"Time":"2026-10-25T15:35:21.009394391+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestHoldsTheSeat (2s)\n"}
+{"Time":"2026-10-25T15:35:21.009398021+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestWaitsForTheBus (2s)\n"}
+{"Time":"2026-10-25T15:35:21.009401801+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009406481+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 81 [running]:\n"}
+{"Time":"2026-10-25T15:35:21.009409911+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.(*M).startAlarm.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009413361+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2961 +0x34a\n"}
+{"Time":"2026-10-25T15:35:21.009418341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by time.goFunc\n"}
+{"Time":"2026-10-25T15:35:21.009421781+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/time/sleep.go:182 +0x2d\n"}
+{"Time":"2026-10-25T15:35:21.009424991+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009428341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 1 [chan receive]:\n"}
+{"Time":"2026-10-25T15:35:21.009431721+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner.func1()\n"}
+{"Time":"2026-10-25T15:35:21.009441811+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2144 +0x425\n"}
+{"Time":"2026-10-25T15:35:21.009445511+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702008, 0x282e9646bc8)\n"}
+{"Time":"2026-10-25T15:35:21.009449641+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2201 +0x123\n"}
+{"Time":"2026-10-25T15:35:21.009453471+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.runTests({0x55a45d, 0x17}, {0x55a45d, 0x17}, 0x282e95940f0, {0x6f19f0, 0x2, 0x2}, {0xc2afa2ca3b3c0c8d, 0x7737f168, ...})\n"}
+{"Time":"2026-10-25T15:35:21.009462092+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2742 +0x510\n"}
+{"Time":"2026-10-25T15:35:21.009467222+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.(*M).Run(0x282e96581e0)\n"}
+{"Time":"2026-10-25T15:35:21.009470662+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2602 +0x6af\n"}
+{"Time":"2026-10-25T15:35:21.009473692+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"main.main()\n"}
+{"Time":"2026-10-25T15:35:21.009476942+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t_testmain.go:48 +0x9b\n"}
+{"Time":"2026-10-25T15:35:21.009480092+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009483242+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 7 [sleep]:\n"}
+{"Time":"2026-10-25T15:35:21.009486502+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"time.Sleep(0xdf8475800)\n"}
+{"Time":"2026-10-25T15:35:21.009490682+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
+{"Time":"2026-10-25T15:35:21.009493812+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat(0x282e9702248?)\n"}
+{"Time":"2026-10-25T15:35:21.009498842+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:14 +0x9e\n"}
+{"Time":"2026-10-25T15:35:21.009502242+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702248, 0x6d5e78)\n"}
+{"Time":"2026-10-25T15:35:21.009505742+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
+{"Time":"2026-10-25T15:35:21.009509292+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by testing.(*T).Run in goroutine 1\n"}
+{"Time":"2026-10-25T15:35:21.009512752+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
+{"Time":"2026-10-25T15:35:21.009515792+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
+{"Time":"2026-10-25T15:35:21.009518623+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 8 [sleep]:\n"}
+{"Time":"2026-10-25T15:35:21.009521303+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"time.Sleep(0xdf8475800)\n"}
+{"Time":"2026-10-25T15:35:21.009524423+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
+{"Time":"2026-10-25T15:35:21.009531403+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestWaitsForTheBus(0x282e9702488?)\n"}
+{"Time":"2026-10-25T15:35:21.009534943+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:19 +0x25\n"}
+{"Time":"2026-10-25T15:35:21.009538403+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702488, 0x6d5e80)\n"}
+{"Time":"2026-10-25T15:35:21.009541953+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
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+{"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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-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}

modules/mesh-build-go/go.mod

@@ -3,7 +3,7 @@ module meshbuildgo
 go 1.26.0
 
 require (
-	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8
 	github.com/distribution/distribution/v3 v3.1.2
 	github.com/nats-io/nats-server/v2 v2.11.17
 	github.com/nats-io/nats.go v1.54.0

modules/mesh-build-go/go.sum

@@ -1,5 +1,5 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468 h1:UcMee+IV2ii5E4dRZdQUaSaeh9IedTFYumuQbBiB0k0=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8 h1:x4mvY7yiGTP5lnzxbiwyj1o24p05hAmzZP7xHg3XX2M=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
 github.com/alicebob/miniredis/v2 v2.35.0 h1:QwLphYqCEAo1eu1TqPRN2jgVMPBweeQcR21jeqDCONI=
 github.com/alicebob/miniredis/v2 v2.35.0/go.mod h1:TcL7YfarKPGDAthEtl5NBeHZfeUQj6OXMm/+iu5cLMM=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op h1:Z/MZK75wC/NSrkgqeNIa7jexam9uWzhLmFTSCPI/kn0=

modules/mesh-build-go/module.json

@@ -10,7 +10,7 @@
   "state": [
     "toolchains",
     "keys",
-    "steps"
+    {"name": "steps", "ttl-seconds": 172800}, "pauses"
   ],
   "claims": [
     {
@@ -20,7 +20,8 @@
     }
   ],
   "reads": [
-    "mesh-delivery-checker.kept"
+    "mesh-delivery-checker.kept",
+    "mesh-delivery-indexer.manifests"
   ],
   "config": {
     "capacity": {

modules/mesh-build-image/cmd/mesh-build-image/announce.go

@@ -13,6 +13,7 @@ import (
 var Kept = []announce.State{
 	{Name: "keys", Readable: true},
 	{Name: "steps", Readable: true},
+	{Name: "pauses", Readable: true},
 }
 
 // keepStates announces Kept as this module's (stdio.Keeps): main calls it before it serves.

modules/mesh-build-image/cmd/mesh-build-image/asks.go

@@ -37,16 +37,20 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskImage}
 	}
 	capacity := m.Capacity
+	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
+	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
+	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
+		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
-	if m.ReadSteps.Get != nil {
-		load = func(key string) ([]byte, error) { return m.ReadSteps.Get(key) }
+	if m.ReadPauses.Get != nil {
+		load = func(key string) ([]byte, error) { return m.ReadPauses.Get(key) }
 	}
-	return &buildstep.Puller{Source: source, Language: delivery.AskImage, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, Logf: m.Say,
+	return &buildstep.Puller{Source: source, Language: delivery.AskImage, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load,
+		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
 				return nil, err

modules/mesh-build-image/cmd/mesh-build-image/main.go

@@ -29,13 +29,15 @@ func logf(format string, a ...any) { fmt.Fprintf(os.Stderr, "[mesh-build-image]
 func main() {
 	ctx := context.Background()
 	m := &Module{
-		Node:      strings.TrimSpace(os.Getenv("MESH_NODE")),
-		Steps:     stdio.State(delivery.StepsState).Put,
-		ReadSteps: readOf(stdio.State(delivery.StepsState)),
-		Ctx:       ctx,
-		Say:       logf,
-		Work:      WorkDir,
-		Store:     StoreDir,
+		Node:       strings.TrimSpace(os.Getenv("MESH_NODE")),
+		Steps:      stdio.State(delivery.StepsState).Put,
+		ReadSteps:  readOf(stdio.State(delivery.StepsState)),
+		Pauses:     stdio.State(delivery.PausesState).Put,
+		ReadPauses: readOf(stdio.State(delivery.PausesState)),
+		Ctx:        ctx,
+		Say:        logf,
+		Work:       WorkDir,
+		Store:      StoreDir,
 	}
 	m.Floor = floorOf(m.Node)
 	if u, err := user.Current(); err == nil {

modules/mesh-build-image/cmd/mesh-build-image/manifest_test.go

@@ -97,9 +97,13 @@ func TestManifestKeepsItsStatesClaimsItsBuildSeatAndDeclaresItsHealthTool(t *tes
 	states := []string{}
 	for _, s := range m.State {
 		states = append(states, s.Name)
+		// A step's key is per step and dropped after its age, so the bucket cannot fill; a pause has no age.
+		if (s.Name == "steps") != (s.TTLSeconds > 0) {
+			t.Errorf("state %s has ttl-seconds %d: only steps has an age", s.Name, s.TTLSeconds)
+		}
 	}
 	slices.Sort(states)
-	if want := []string{"keys", "steps"}; !slices.Equal(states, want) {
+	if want := []string{"keys", "pauses", "steps"}; !slices.Equal(states, want) {
 		t.Errorf("state = %v, want %v", states, want)
 	}
 	if len(m.Claims) != 1 || m.Claims[0].Name != Seat || !slices.Equal(m.Claims[0].Serves, []string{"current", "pause", "resume"}) {

modules/mesh-build-image/cmd/mesh-build-image/module.go

@@ -24,6 +24,9 @@ type Module struct {
 	// Steps is the Put of the steps state; ReadSteps reads it back for the read tools.
 	Steps     buildstep.Put
 	ReadSteps StateRead
+	// Pauses is the Put of the pauses state, which keeps the node's pause key without an age; ReadPauses reads it back.
+	Pauses     buildstep.Put
+	ReadPauses StateRead
 	// Ctx is the process's context, which a step runs under (the tool call's is cut at 30 s, the step's is not).
 	Ctx context.Context
 	Say func(format string, a ...any)

modules/mesh-build-image/cmd/mesh-build-image/read.go

@@ -7,9 +7,12 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"sort"
 	"strconv"
 	"strings"
+	"sync"
+	"time"
 
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
@@ -38,6 +41,53 @@ func readOf(s stdio.KeptState) StateRead {
 	}}
 }
 
+// MaxStateReads is the most values one read tool reads from a state in a call, and stateReadParallel how many of them
+// are in flight at once. Every value is a round trip from the tool through the runtime to the bus, so a call that read
+// every key of a large state one after the other outlasted the call's 30 s (issue 1827: 1164 keys, 20 MB).
+const (
+	MaxStateReads     = 1000
+	stateReadParallel = 16
+)
+
+// readValues reads the values of keys, stateReadParallel at a time, in the order of keys (nil for a key with none). It
+// stops starting reads after the first error and returns it.
+func readValues(keys []string, get func(string) (json.RawMessage, error)) ([]json.RawMessage, error) {
+	out := make([]json.RawMessage, len(keys))
+	var (
+		wg   sync.WaitGroup
+		mu   sync.Mutex
+		fail error
+		next = make(chan int)
+	)
+	for w := 0; w < stateReadParallel && w < len(keys); w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for i := range next {
+				raw, err := get(keys[i])
+				mu.Lock()
+				if err != nil && fail == nil {
+					fail = err
+				}
+				mu.Unlock()
+				out[i] = raw
+			}
+		}()
+	}
+	for i := range keys {
+		mu.Lock()
+		stop := fail != nil
+		mu.Unlock()
+		if stop {
+			break
+		}
+		next <- i
+	}
+	close(next)
+	wg.Wait()
+	return out, fail
+}
+
 // stepKey is the key of a step of this node: the id alone, or the whole key <node>.<id> as a step tool answered it.
 func (m *Module) stepKey(id string) (string, error) {
 	id = strings.TrimSpace(id)
@@ -79,27 +129,41 @@ type StepLine struct {
 	Reason  string `json:"reason,omitempty"`
 }
 
-// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero).
-func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
+// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero). Only
+// the node's own keys (<node>.) are listed and the newest max(limit*4, 100) of them read (at most MaxStateReads): a step's
+// id is base-36 milliseconds and random digits, so its string order is its start order. cut says older steps were not
+// read. The values still order the lines, since an ask step's id carries the ask time.
+func (m *Module) RecentSteps(limit int) (lines []StepLine, cut bool, err error) {
 	if limit <= 0 {
 		limit = 10
 	}
 	if m.ReadSteps.Keys == nil || m.ReadSteps.Get == nil {
-		return nil, fmt.Errorf("the steps state cannot be read here")
+		return nil, false, fmt.Errorf("the steps state cannot be read here")
 	}
+	start := time.Now()
 	keys, err := m.ReadSteps.Keys()
 	if err != nil {
-		return nil, err
+		return nil, false, err
+	}
+	own := keys[:0:0]
+	for _, k := range keys {
+		if strings.HasPrefix(k, m.Node+".") {
+			if node, _, err := delivery.ParseStepKey(k); err == nil && node == m.Node {
+				own = append(own, k)
+			}
+		}
+	}
+	sort.Sort(sort.Reverse(sort.StringSlice(own)))
+	if n := min(max(limit*4, 100), MaxStateReads); len(own) > n {
+		own, cut = own[:n], true
+	}
+	raws, err := readValues(own, m.ReadSteps.Get)
+	log.Printf("steps read: %d of %d keys listed read in %v (cut %v)", len(own), len(keys), time.Since(start).Round(time.Millisecond), cut)
+	if err != nil {
+		return nil, cut, err
 	}
 	var steps []delivery.Step
-	for _, k := range keys {
-		if node, _, err := delivery.ParseStepKey(k); err != nil || node != m.Node {
-			continue
-		}
-		raw, err := m.ReadSteps.Get(k)
-		if err != nil {
-			return nil, err
-		}
+	for _, raw := range raws {
 		if len(raw) == 0 {
 			continue
 		}
@@ -121,7 +185,7 @@ func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
 		}
 		out = append(out, l)
 	}
-	return out, nil
+	return out, cut, nil
 }
 
 // ReadTools are the module's read tools. All are read-only.
@@ -143,8 +207,13 @@ func (m *Module) ReadTools() []stdio.Tool {
 			Input: map[string]any{"type": "object", "properties": map[string]any{
 				"limit": map[string]any{"type": "integer", "description": "how many, at most; 10 when left out"}}},
 			Run: func(args map[string]any) (any, error) {
-				steps, err := m.RecentSteps(intArg(args["limit"]))
-				return map[string]any{"node": m.Node, "steps": steps}, err
+				steps, cut, err := m.RecentSteps(intArg(args["limit"]))
+				ans := map[string]any{"node": m.Node, "steps": steps}
+				if cut {
+					ans["cut"] = true
+					ans["note"] = fmt.Sprintf("this node has more steps stored than one call reads; older steps were not read (ask for a larger limit, at most %d reads)", MaxStateReads)
+				}
+				return ans, err
 			}},
 	}
 }

modules/mesh-build-image/cmd/mesh-build-image/read_test.go

@@ -2,7 +2,11 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
+	"strings"
+	"sync/atomic"
 	"testing"
+	"time"
 
 	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
@@ -39,8 +43,67 @@ func TestTheReadToolsAnswerAStepsResult(t *testing.T) {
 	if err := json.Unmarshal(got.Result, &back); err != nil || back.Digest != res.Digest {
 		t.Errorf("result = %s, %v", got.Result, err)
 	}
-	lines, err := m.RecentSteps(0)
+	lines, _, err := m.RecentSteps(0)
 	if err != nil || len(lines) != 1 || lines[0].Tool != BuildTool {
 		t.Errorf("steps = %+v, %v", lines, err)
 	}
 }
+
+// 1827: on the live shape (4 nodes, 600 steps each; a steps state of 1164 keys / 20 MB timed out at 30 s) the steps tool
+// lists, then reads only this node's keys, in parallel, at most MaxStateReads of them, and says when it cut.
+func TestRecentStepsReadsOnlyTheNodesKeysInParallelAndBounded(t *testing.T) {
+	t0 := time.Date(2026, 10, 25, 9, 0, 0, 0, time.UTC)
+	for _, row := range []struct {
+		perNode, limit int
+		reads          int64
+		steps          int
+		cut            bool
+	}{
+		{20, 0, 20, 10, false},
+		{600, 0, 100, 10, true},
+		{1500, 300, MaxStateReads, 300, true},
+	} {
+		var reads, inFlight, maxFlight atomic.Int64
+		stored := map[string][]byte{}
+		for _, n := range []string{"ace", "g14", "novox", "shanks"} {
+			for i := 0; i < row.perNode; i++ {
+				b, _ := delivery.EncodeStep(delivery.Step{ID: fmt.Sprintf("s%04d", i), Tool: "t", Node: n, State: delivery.StepPassed, Started: t0.Add(time.Duration(i) * time.Second)})
+				stored[n+".s"+fmt.Sprintf("%04d", i)] = b
+			}
+		}
+		m := &Module{Node: "shanks"}
+		m.ReadSteps = StateRead{
+			Keys: func() ([]string, error) {
+				var k []string
+				for key := range stored {
+					k = append(k, key)
+				}
+				return k, nil
+			},
+			Get: func(key string) (json.RawMessage, error) {
+				reads.Add(1)
+				now := inFlight.Add(1)
+				for o := maxFlight.Load(); now > o && !maxFlight.CompareAndSwap(o, now); o = maxFlight.Load() {
+				}
+				time.Sleep(time.Millisecond)
+				inFlight.Add(-1)
+				if !strings.HasPrefix(key, "shanks.") {
+					t.Errorf("read %s, a key of another node", key)
+				}
+				return stored[key], nil
+			},
+		}
+		start := time.Now()
+		lines, cut, err := m.RecentSteps(row.limit)
+		if err != nil || len(lines) != row.steps || cut != row.cut || reads.Load() != row.reads {
+			t.Errorf("%d a node: %d steps, cut %v, %d reads, err %v; want %d, %v, %d", row.perNode, len(lines), cut, reads.Load(), err, row.steps, row.cut, row.reads)
+		}
+		if row.cut && len(lines) > 0 && lines[0].ID != fmt.Sprintf("s%04d", row.perNode-1) {
+			t.Errorf("%d a node: newest answered %s", row.perNode, lines[0].ID)
+		}
+		if maxFlight.Load() < 2 {
+			t.Errorf("%d a node: values read one at a time", row.perNode)
+		}
+		t.Logf("%d a node: %d reads in %v (one after the other: %v)", row.perNode, reads.Load(), time.Since(start), time.Duration(reads.Load())*time.Millisecond)
+	}
+}

modules/mesh-build-image/cmd/mesh-build-image/reads-outside

@@ -0,0 +1 @@
+These tests read other catalogue modules' files, outside this module (issue 1935): never kept.

modules/mesh-build-image/go.mod

@@ -3,7 +3,7 @@ module meshbuildimage
 go 1.26.0
 
 require (
-	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8
 	github.com/nats-io/nats-server/v2 v2.11.17
 	github.com/nats-io/nats.go v1.54.0
 )

modules/mesh-build-image/go.sum

@@ -1,5 +1,5 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468 h1:UcMee+IV2ii5E4dRZdQUaSaeh9IedTFYumuQbBiB0k0=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023150321-a2c813a6b468/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8 h1:x4mvY7yiGTP5lnzxbiwyj1o24p05hAmzZP7xHg3XX2M=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025175617-518dae5ec9c8/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op h1:Z/MZK75wC/NSrkgqeNIa7jexam9uWzhLmFTSCPI/kn0=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op/go.mod h1:FQyySiasQQM8735Ddel3MRojmy4dA1IqCeyJ5jmPMbI=
 github.com/google/go-tpm v0.9.8 h1:slArAR9Ft+1ybZu0lBwpSmpwhRXaa85hWtMinMyRAWo=

modules/mesh-build-image/module.json

@@ -9,7 +9,7 @@
   ],
   "state": [
     "keys",
-    "steps"
+    {"name": "steps", "ttl-seconds": 172800}, "pauses"
   ],
   "claims": [
     {

modules/mesh-build-node/cmd/mesh-build-node/announce.go

@@ -14,6 +14,7 @@ var Kept = []announce.State{
 	{Name: "toolchains", Readable: true},
 	{Name: "keys", Readable: true},
 	{Name: "steps", Readable: true},
+	{Name: "pauses", Readable: true},
 }
 
 // keepStates announces Kept as this module's (stdio.Keeps): main calls it before it serves.

modules/mesh-build-node/cmd/mesh-build-node/asks.go

@@ -45,16 +45,20 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskNode}
 	}
 	capacity := m.Capacity
+	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
+	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
+	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
+		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
-	if m.ReadSteps.Get != nil {
-		load = func(key string) ([]byte, error) { return m.ReadSteps.Get(key) }
+	if m.ReadPauses.Get != nil {
+		load = func(key string) ([]byte, error) { return m.ReadPauses.Get(key) }
 	}
-	return &buildstep.Puller{Source: source, Language: delivery.AskNode, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, Logf: m.Say,
+	return &buildstep.Puller{Source: source, Language: delivery.AskNode, Node: m.Node, Put: m.Steps, PausePut: m.Pauses, Load: load,
+		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Prepare(ctx); err != nil {
 				return nil, err

modules/mesh-build-node/cmd/mesh-build-node/main.go

@@ -46,6 +46,8 @@ func main() {
 		Emit:                func(t string, b any) error { return stdio.Emit(t, b) },
 		Steps:               stdio.State(delivery.StepsState).Put,
 		ReadSteps:           readOf(stdio.State(delivery.StepsState)),
+		Pauses:              stdio.State(delivery.PausesState).Put,
+		ReadPauses:          readOf(stdio.State(delivery.PausesState)),
 		ReadToolchainsState: readOf(stdio.State(delivery.ToolchainsState)),
 		Work:                WorkDir,
 		Run:                 forgekey.ExecRunnerClean(0),

modules/mesh-build-node/cmd/mesh-build-node/manifest_test.go

@@ -94,9 +94,13 @@ func TestManifestKeepsItsStatesClaimsItsBuildSeatAndDeclaresItsHealthTool(t *tes
 	states := []string{}
 	for _, s := range m.State {
 		states = append(states, s.Name)
+		// A step's key is per step and dropped after its age, so the bucket cannot fill; a pause has no age.
+		if (s.Name == "steps") != (s.TTLSeconds > 0) {
+			t.Errorf("state %s has ttl-seconds %d: only steps has an age", s.Name, s.TTLSeconds)
+		}
 	}
 	slices.Sort(states)
-	if want := []string{"keys", "steps", "toolchains"}; !slices.Equal(states, want) {
+	if want := []string{"keys", "pauses", "steps", "toolchains"}; !slices.Equal(states, want) {
 		t.Errorf("state = %v, want %v", states, want)
 	}
 	if len(m.Claims) != 1 || m.Claims[0].Name != Seat || !slices.Equal(m.Claims[0].Serves, []string{"current", "pause", "resume"}) {

modules/mesh-build-node/cmd/mesh-build-node/module.go

@@ -43,6 +43,9 @@ type Module struct {
 	Toolchains, Steps buildstep.Put
 	// ReadSteps and ReadToolchainsState read those two states back for the read tools (issue 1562).
 	ReadSteps, ReadToolchainsState StateRead
+	// Pauses is the Put of the pauses state, which keeps the node's pause key without an age; ReadPauses reads it back.
+	Pauses     buildstep.Put
+	ReadPauses StateRead
 	// Emit tells the bus an event (stdio.Emit); nil emits nothing. The guard emits toolchain.reported after each write of
 	// the toolchains key, so the indexer, which holds no timer, learns that the bucket exists (issue 1444).
 	Emit func(eventType string, body any) error

modules/mesh-build-node/cmd/mesh-build-node/read.go

@@ -7,9 +7,12 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"sort"
 	"strconv"
 	"strings"
+	"sync"
+	"time"
 
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
@@ -39,6 +42,53 @@ func readOf(s stdio.KeptState) StateRead {
 	}}
 }
 
+// MaxStateReads is the most values one read tool reads from a state in a call, and stateReadParallel how many of them
+// are in flight at once. Every value is a round trip from the tool through the runtime to the bus, so a call that read
+// every key of a large state one after the other outlasted the call's 30 s (issue 1827: 1164 keys, 20 MB).
+const (
+	MaxStateReads     = 1000
+	stateReadParallel = 16
+)
+
+// readValues reads the values of keys, stateReadParallel at a time, in the order of keys (nil for a key with none). It
+// stops starting reads after the first error and returns it.
+func readValues(keys []string, get func(string) (json.RawMessage, error)) ([]json.RawMessage, error) {
+	out := make([]json.RawMessage, len(keys))
+	var (
+		wg   sync.WaitGroup
+		mu   sync.Mutex
+		fail error
+		next = make(chan int)
+	)
+	for w := 0; w < stateReadParallel && w < len(keys); w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for i := range next {
+				raw, err := get(keys[i])
+				mu.Lock()
+				if err != nil && fail == nil {
+					fail = err
+				}
+				mu.Unlock()
+				out[i] = raw
+			}
+		}()
+	}
+	for i := range keys {
+		mu.Lock()
+		stop := fail != nil
+		mu.Unlock()
+		if stop {
+			break
+		}
+		next <- i
+	}
+	close(next)
+	wg.Wait()
+	return out, fail
+}
+
 // stepKey is the key of a step of this node: the id alone, or the whole key <node>.<id> as a step tool answered it.
 func (m *Module) stepKey(id string) (string, error) {
 	id = strings.TrimSpace(id)
@@ -80,27 +130,41 @@ type StepLine struct {
 	Reason  string `json:"reason,omitempty"`
 }
 
-// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero).
-func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
+// RecentSteps are this node's steps, the latest started first, at most limit (ten when limit is not above zero). Only
+// the node's own keys (<node>.) are listed and the newest max(limit*4, 100) of them read (at most MaxStateReads): a step's
+// id is base-36 milliseconds and random digits, so its string order is its start order. cut says older steps were not
+// read. The values still order the lines, since an ask step's id carries the ask time.
+func (m *Module) RecentSteps(limit int) (lines []StepLine, cut bool, err error) {
 	if limit <= 0 {
 		limit = 10
 	}
 	if m.ReadSteps.Keys == nil || m.ReadSteps.Get == nil {
-		return nil, fmt.Errorf("the steps state cannot be read here")
+		return nil, false, fmt.Errorf("the steps state cannot be read here")
 	}
+	start := time.Now()
 	keys, err := m.ReadSteps.Keys()
 	if err != nil {
-		return nil, err
+		return nil, false, err
+	}
+	own := keys[:0:0]
+	for _, k := range keys {
+		if strings.HasPrefix(k, m.Node+".") {
+			if node, _, err := delivery.ParseStepKey(k); err == nil && node == m.Node {
+				own = append(own, k)
+			}
+		}
+	}
+	sort.Sort(sort.Reverse(sort.StringSlice(own)))
+	if n := min(max(limit*4, 100), MaxStateReads); len(own) > n {
+		own, cut = own[:n], true
+	}
+	raws, err := readValues(own, m.ReadSteps.Get)
+	log.Printf("steps read: %d of %d keys listed read in %v (cut %v)", len(own), len(keys), time.Since(start).Round(time.Millisecond), cut)
+	if err != nil {
+		return nil, cut, err
 	}
 	var steps []delivery.Step
-	for _, k := range keys {
-		if node, _, err := delivery.ParseStepKey(k); err != nil || node != m.Node {
-			continue
-		}
-		raw, err := m.ReadSteps.Get(k)
-		if err != nil {
-			return nil, err
-		}
+	for _, raw := range raws {
 		if len(raw) == 0 {
 			continue
 		}
@@ -122,7 +186,7 @@ func (m *Module) RecentSteps(limit int) ([]StepLine, error) {
 		}
 		out = append(out, l)
 	}
-	return out, nil
+	return out, cut, nil
 }
 
 // ReadToolchains is every key of the toolchains state (<node>.<language>) with its stored value.
@@ -130,24 +194,30 @@ func (m *Module) ReadToolchains() (map[string]delivery.Toolchain, error) {
 	if m.ReadToolchainsState.Keys == nil || m.ReadToolchainsState.Get == nil {
 		return nil, fmt.Errorf("the toolchains state cannot be read here")
 	}
+	start := time.Now()
 	keys, err := m.ReadToolchainsState.Keys()
 	if err != nil {
 		return nil, err
 	}
+	cut := len(keys) > MaxStateReads
+	if cut {
+		keys = keys[:MaxStateReads] // a node has a key per language: far fewer in practice
+	}
+	raws, err := readValues(keys, m.ReadToolchainsState.Get)
+	log.Printf("toolchains read: %d keys read in %v (cut %v: keys past %d were not read)", len(keys), time.Since(start).Round(time.Millisecond), cut, MaxStateReads)
+	if err != nil {
+		return nil, err
+	}
 	out := map[string]delivery.Toolchain{}
-	for _, k := range keys {
-		raw, err := m.ReadToolchainsState.Get(k)
-		if err != nil {
-			return nil, err
-		}
+	for i, raw := range raws {
 		if len(raw) == 0 {
 			continue
 		}
 		t, err := delivery.DecodeToolchain(raw)
 		if err != nil {
-			return nil, fmt.Errorf("%s: %w", k, err)
+			return nil, fmt.Errorf("%s: %w", keys[i], err)
 		}
-		out[k] = t
+		out[keys[i]] = t
 	}
 	return out, nil
 }
@@ -171,8 +241,13 @@ func (m *Module) ReadTools() []stdio.Tool {
 			Input: map[string]any{"type": "object", "properties": map[string]any{
 				"limit": map[string]any{"type": "integer", "description": "how many, at most; 10 when left out"}}},
 			Run: func(args map[string]any) (any, error) {
-				steps, err := m.RecentSteps(intArg(args["limit"]))
-				return map[string]any{"node": m.Node, "steps": steps}, err
+				steps, cut, err := m.RecentSteps(intArg(args["limit"]))
+				ans := map[string]any{"node": m.Node, "steps": steps}
+				if cut {
+					ans["cut"] = true
+					ans["note"] = fmt.Sprintf("this node has more steps stored than one call reads; older steps were not read (ask for a larger limit, at most %d reads)", MaxStateReads)
+				}
+				return ans, err
 			}},
 		{Name: ToolchainsReadTool,
 			Description: "What the module's toolchains state holds: each key <node>.<language> with the version installed, the " +

modules/mesh-build-node/cmd/mesh-build-node/read_test.go

@@ -3,8 +3,10 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"slices"
 	"strings"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -145,3 +147,62 @@ func TestReadToolsAreInTheManifestAndNeedNoToolchain(t *testing.T) {
 		t.Errorf("the read refused: %v", err)
 	}
 }
+
+// 1827: on the live shape (4 nodes, 600 steps each; a steps state of 1164 keys / 20 MB timed out at 30 s) the steps tool
+// lists, then reads only this node's keys, in parallel, at most MaxStateReads of them, and says when it cut.
+func TestRecentStepsReadsOnlyTheNodesKeysInParallelAndBounded(t *testing.T) {
+	t0 := time.Date(2026, 10, 25, 9, 0, 0, 0, time.UTC)
+	for _, row := range []struct {
+		perNode, limit int
+		reads          int64
+		steps          int
+		cut            bool
+	}{
+		{20, 0, 20, 10, false},
+		{600, 0, 100, 10, true},
+		{1500, 300, MaxStateReads, 300, true},
+	} {
+		var reads, inFlight, maxFlight atomic.Int64
+		stored := map[string][]byte{}
+		for _, n := range []string{"ace", "g14", "novox", "shanks"} {
+			for i := 0; i < row.perNode; i++ {
+				b, _ := delivery.EncodeStep(delivery.Step{ID: fmt.Sprintf("s%04d", i), Tool: "t", Node: n, State: delivery.StepPassed, Started: t0.Add(time.Duration(i) * time.Second)})
+				stored[n+".s"+fmt.Sprintf("%04d", i)] = b
+			}
+		}
+		m := &Module{Node: "shanks"}
+		m.ReadSteps = StateRead{
+			Keys: func() ([]string, error) {
+				var k []string
+				for key := range stored {
+					k = append(k, key)
+				}
+				return k, nil
+			},
+			Get: func(key string) (json.RawMessage, error) {
+				reads.Add(1)
+				now := inFlight.Add(1)
+				for o := maxFlight.Load(); now > o && !maxFlight.CompareAndSwap(o, now); o = maxFlight.Load() {
+				}
+				time.Sleep(time.Millisecond)
+				inFlight.Add(-1)
+				if !strings.HasPrefix(key, "shanks.") {
+					t.Errorf("read %s, a key of another node", key)
+				}
+				return stored[key], nil
+			},
+		}
+		start := time.Now()
+		lines, cut, err := m.RecentSteps(row.limit)
+		if err != nil || len(lines) != row.steps || cut != row.cut || reads.Load() != row.reads {
+			t.Errorf("%d a node: %d steps, cut %v, %d reads, err %v; want %d, %v, %d", row.perNode, len(lines), cut, reads.Load(), err, row.steps, row.cut, row.reads)
+		}
+		if row.cut && len(lines) > 0 && lines[0].ID != fmt.Sprintf("s%04d", row.perNode-1) {
+			t.Errorf("%d a node: newest answered %s", row.perNode, lines[0].ID)
+		}
+		if maxFlight.Load() < 2 {
+			t.Errorf("%d a node: values read one at a time", row.perNode)
+		}
+		t.Logf("%d a node: %d reads in %v (one after the other: %v)", row.perNode, reads.Load(), time.Since(start), time.Duration(reads.Load())*time.Millisecond)
+	}
+}

modules/mesh-build-node/cmd/mesh-build-node/reads-outside

@@ -0,0 +1 @@
+These tests read other catalogue modules' files, outside this module (issue 1935): never kept.