Join item 6: the builder says version.numbered as delivery.VersionNumbered and reads out-of-step by BuildAnswer's field

versions.NumberedBody and NumberedEvent are mesh-sdk's delivery.VersionNumbered and VersionNumberedEvent now (J3), the
contract a build module consumes for BG2's late publish; the body's JSON is unchanged. The lane reads a step's
out-of-step files through delivery.BuildAnswer.OutOfStep, a failed step's result too (as before, A2k's d15d66fc: read
before the step's state; its three rows hold it), in place of a local decode by name. The integration test hears
version.numbered on delivery.VersionNumberedSubject and reads it with DecodeVersionNumbered, as a build module does.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/mesh-delivery-builder/cmd/mesh-delivery-builder/integration_test.go

@@ -1141,7 +1141,7 @@ type registry struct {
 	b                          *bed
 	versions, findings, reasks jetstream.KeyValue
 	mu                         sync.Mutex
-	numbered                   []versions.NumberedBody
+	numbered                   []delivery.VersionNumbered
 	removes                    []map[string]any
 }
 
@@ -1189,9 +1189,9 @@ func (b *bed) registry(t *testing.T, node string, seatVersions ...string) *regis
 		t.Fatal(err)
 	}
 	nc := b.js.Conn()
-	sub, err := nc.Subscribe("mesh.mod."+delivery.BuilderModule+".event."+versions.NumberedEvent, func(m *nats.Msg) {
-		var nb versions.NumberedBody
-		if json.Unmarshal(m.Data, &nb) == nil {
+	// As a build module hears it: on the contract's subject, read by the contract's decoder (BG2's late publish).
+	sub, err := nc.Subscribe(delivery.VersionNumberedSubject, func(m *nats.Msg) {
+		if nb, err := delivery.DecodeVersionNumbered(m.Data); err == nil {
 			r.mu.Lock()
 			r.numbered = append(r.numbered, nb)
 			r.mu.Unlock()

modules/mesh-delivery-builder/cmd/mesh-delivery-builder/main.go

@@ -148,7 +148,7 @@ func run(ctx context.Context, getenv func(string) string, logOut io.Writer) erro
 	packagesKV := process.AwaitBucket(ctx, js, conn, delivery.PackagesBucket, "no package is numbered: each is built unnumbered and said", logger.Printf)
 	numberer := &versions.Numberer{Versions: versions.Versions{Store: awaitedVersions{versionsKV}}, Floor: floorVia(calls.Call), Waits: floorWaits,
 		Names: versions.NamesIn(indexerPackages{packagesKV}),
-		Said: func(nb versions.NumberedBody) {
+		Said: func(nb delivery.VersionNumbered) {
 			if err := emitNumbered(context.WithoutCancel(ctx), js, cred, nb); err != nil {
 				logger.Printf("%v", err)
 			}

modules/mesh-delivery-builder/cmd/mesh-delivery-builder/versions.go

@@ -186,13 +186,13 @@ func floorVia(call toolCaller) versions.FloorSources {
 
 // emitNumbered says the builder's event version.numbered (design 51 *Events of the builder*), on its own family apart
 // from its builds' ends; the name and version are the bus's dedup id.
-func emitNumbered(ctx context.Context, js jetstream.JetStream, cred process.Account, b versions.NumberedBody) error {
+func emitNumbered(ctx context.Context, js jetstream.JetStream, cred process.Account, b delivery.VersionNumbered) error {
 	id := "numbered-" + versions.Key(b.Name, b.Version)
 	if b.Again != "" {
 		id += "-again-" + b.Again
 	}
-	if err := emitEvent(ctx, js, cred, versions.NumberedEvent, id, b); err != nil {
-		return fmt.Errorf("saying %s for %s@%s: %w", versions.NumberedEvent, b.Name, b.Version, err)
+	if err := emitEvent(ctx, js, cred, delivery.VersionNumberedEvent, id, b); err != nil {
+		return fmt.Errorf("saying %s for %s@%s: %w", delivery.VersionNumberedEvent, b.Name, b.Version, err)
 	}
 	return nil
 }