DLV-B2: a package is numbered under its name in its ecosystem, read from the indexer's packages state

The builder numbers, asks the floor of, records and tags a package under the name the indexer's series key names for
its <module>/<artifact> (a Go module path, an npm package name; design 32), so builder_versions answers the holder's
question by the name a registry seat publishes it under. A package the state names nothing for, or a state not readable,
is built unnumbered and said; the rest of the claim is numbered.

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

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

@@ -129,7 +129,10 @@ func run(ctx context.Context, getenv func(string) string, logOut io.Writer) erro
 		Ready(func(kv jetstream.KeyValue) {
 			floorWaits.Keep(kvKeeper{ctx: ctx, kv: kv}, heldFloorWaits(ctx, kv, logger.Printf))
 		})
+	// A package is numbered under its name in its ecosystem, read from the indexer's packages state (design 32).
+	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) {
 			if err := emitNumbered(context.WithoutCancel(ctx), js, cred, nb); err != nil {
 				logger.Printf("%v", err)

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

@@ -110,7 +110,7 @@ func tagNumbered(kv func() jetstream.KeyValue, logf func(string, ...any), now fu
 				if err != nil {
 					break
 				}
-				t, changed := t.WithNumbered(c.Module, c.Head, got.Versions, now())
+				t, changed := t.WithNumbered(c.Module, c.Head, got.Versions, got.Names, now())
 				if !changed {
 					break
 				}

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

@@ -53,6 +53,40 @@ func (s awaitedVersions) Get(ctx context.Context, key string) ([]byte, uint64, b
 	return e.Value(), e.Revision(), true, nil
 }
 
+// indexerPackages is the indexer's packages state (delivery.PackagesBucket, the manifest's reads grant) as the builder
+// reads a package's name in its ecosystem from it (design 32): bound once the bus holds it; until then a package is
+// built unnumbered and said (versions.Numberer.Names).
+type indexerPackages struct{ b *process.AwaitedBucket }
+
+var errPackagesMissing = errors.New("the indexer's state " + delivery.PackagesBucket + " is not on the bus yet")
+
+func (s indexerPackages) Keys(ctx context.Context) ([]string, error) {
+	kv := s.b.KV()
+	if kv == nil {
+		return nil, errPackagesMissing
+	}
+	keys, err := kv.Keys(ctx)
+	if errors.Is(err, jetstream.ErrNoKeysFound) {
+		return nil, nil
+	}
+	return keys, err
+}
+
+func (s indexerPackages) Get(ctx context.Context, key string) ([]byte, bool, error) {
+	kv := s.b.KV()
+	if kv == nil {
+		return nil, false, errPackagesMissing
+	}
+	e, err := kv.Get(ctx, key)
+	if errors.Is(err, jetstream.ErrKeyNotFound) || errors.Is(err, jetstream.ErrKeyDeleted) {
+		return nil, false, nil
+	}
+	if err != nil {
+		return nil, false, err
+	}
+	return e.Value(), true, nil
+}
+
 func versionsConflict(err error) error {
 	if errors.Is(err, jetstream.ErrKeyExists) || errors.Is(err, jetstream.ErrKeyRevisionMismatch) {
 		return versions.ErrConflict