DLV-F5r (assigner's case): the indexer's runtime answering after the assigner asked is followed within the bound

A case of the assigner's existing whole-module test: the indexer's first views are held until the
assigner has started, and the wants are written from what they answer (ADR 0621 §3).

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

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

@@ -354,6 +354,11 @@ func (b *bed) get(t *testing.T, bucket, key string) []byte {
 // raises the condition naming g14, web and the canary rule; once ace runs F healthy, g14's first want names F and the condition is
 // cleared.
 func TestWantsAreWrittenAndNoDifferenceIs(t *testing.T) {
+	// DLV-F5r (ADR 0621 §3): the indexer's runtime starts together with the assigner and answers its first views only
+	// after the assigner asked; within the bound the assigner writes the wants from what they answer.
+	up := make(chan struct{})
+	indexerLate = up
+	t.Cleanup(func() { indexerLate = nil })
 	b := startBed(t, "")
 	fNew, fOld := delivery.SourcePrefix2+strings.Repeat("b", 64), delivery.SourcePrefix2+strings.Repeat("a", 64)
 	digest := b.manifest(t, "web", `{"module":"web","version":"1"}`)
@@ -381,6 +386,7 @@ func TestWantsAreWrittenAndNoDifferenceIs(t *testing.T) {
 	}
 	b.compose(t, "shanks", 'a')
 	b.start(t)
+	close(up)
 
 	wkey, _ := delivery.WantKey("ace", "web")
 	want, err := delivery.DecodeWant(b.get(t, delivery.AssignerWantsBucket, wkey))
@@ -1269,6 +1275,10 @@ func placementSubjects() []string {
 	return out
 }
 
+// indexerLate, when set before the bed is made, holds every answer of the indexer's first views until it is closed: the
+// indexer's runtime started together with the assigner's, answering after the assigner asked (DLV-F5r).
+var indexerLate chan struct{}
+
 // serveIndexer is the indexer as the owner of its manifests and modules (ADR 0615, ADR 0621): its buckets, which a test
 // fills as the indexer writes them; its views family said by the views emitter onto INDEXER_VIEWS, read by the
 // assigner's durable consumer; and its first-view tools manifests and modules answered from the buckets at their marks.
@@ -1295,7 +1305,15 @@ func serveIndexer(t *testing.T, b *bed, nc *nats.Conn) {
 		if err := em.Start(b.ctx, state, kv, nil); err != nil {
 			t.Fatal(err)
 		}
+		late := indexerLate
 		sub, err := nc.Subscribe("mesh.mod.mesh-delivery-indexer.call."+state+".>", func(m *nats.Msg) {
+			if late != nil { // its runtime comes up after the assigner started (DLV-F5r)
+				select {
+				case <-late:
+				case <-b.ctx.Done():
+					return
+				}
+			}
 			var args struct {
 				After string `json:"after"`
 			}