diff --git a/internal/dispatcher/runtime_integration_test.go b/internal/dispatcher/runtime_integration_test.go
index 4cb7d0d..d51ba6c 100644
--- a/internal/dispatcher/runtime_integration_test.go
+++ b/internal/dispatcher/runtime_integration_test.go
@@ -86,11 +86,32 @@ func TestRuntimeIsolatedControlBacklogExecuteAndSharedResult(t *testing.T) {
 		}
 		defer func(q, key, exchange string) { _ = admin.QueueUnbind(q, key, exchange, nil) }(queue, route.BindingKey, route.Exchange)
 	}
+	// Socket write completion is not broker acceptance. Establish the same
+	// mandatory/confirm boundary required of the simulated SaaS publisher.
+	if err := admin.Confirm(false); err != nil {
+		t.Fatal(err)
+	}
+	returned := admin.NotifyReturn(make(chan amqp.Return, 1))
 	publish := func(route tenant.Route, body []byte) {
 		t.Helper()
-		if err := admin.PublishWithContext(context.Background(), route.Exchange, route.BindingKey, true, false, amqp.Publishing{ContentType: "application/json", DeliveryMode: amqp.Persistent, Body: body}); err != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		confirmation, err := admin.PublishWithDeferredConfirmWithContext(ctx, route.Exchange, route.BindingKey, true, false, amqp.Publishing{ContentType: "application/json", DeliveryMode: amqp.Persistent, Body: body})
+		if err != nil {
 			t.Fatal(err)
 		}
+		if confirmation == nil {
+			t.Fatal("isolated SaaS publisher did not enter confirm mode")
+		}
+		accepted, err := confirmation.WaitContext(ctx)
+		if err != nil || !accepted {
+			t.Fatalf("isolated SaaS message not confirmed: accepted=%v error=%v", accepted, err)
+		}
+		select {
+		case msg := <-returned:
+			t.Fatalf("isolated SaaS message returned: code=%d", msg.ReplyCode)
+		default:
+		}
 	}
 	publish(controlRoute, controlBody(t, "control-example", "pause", "drain"))
 	publish(taskRoute, executeBody(t, "call-example", "15803300952"))
@@ -366,11 +387,35 @@ func TestRuntimeIsolatedControlBacklogExecuteAndSharedResult(t *testing.T) {
 		t.Fatalf("pending SIP change originated call %s", spec.EventID)
 	case <-time.After(120 * time.Millisecond):
 	}
-	for _, eventID := range []string{"stop-backlog-1", "stop-backlog-2"} {
+	// The preceding instruction probes the durable admission fence and may
+	// legitimately have reached the inbox before asynchronous consumer stop.
+	// Do not count it as ready-queue backlog. Establish consumer quiescence
+	// before publishing an independent, confirmed three-message purge fixture.
+	deadline = time.After(5 * time.Second)
+	for {
+		state, err := admin.QueueInspect(taskRoute.Queue)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if state.Consumers == 0 {
+			break
+		}
+		select {
+		case <-deadline:
+			t.Fatalf("consumer did not stop behind SIP admission fence: %+v", state)
+		case <-time.After(20 * time.Millisecond):
+		}
+	}
+	for _, eventID := range []string{"stop-backlog-0", "stop-backlog-1", "stop-backlog-2"} {
 		publish(taskRoute, executeBody(t, eventID, "15003164745"))
 	}
 	if state, err := admin.QueueInspect(taskRoute.Queue); err != nil || state.Messages < 3 {
-		t.Fatalf("expected isolated stop backlog: %+v %v", state, err)
+		pendingCommands, pendingErr := db.ListPendingExecute(id)
+		var pendingIDs []string
+		for _, command := range pendingCommands {
+			pendingIDs = append(pendingIDs, command.EventID)
+		}
+		t.Fatalf("expected isolated stop backlog: queue=%+v inspect_error=%v pending_event_ids=%v pending_error=%v", state, err, pendingIDs, pendingErr)
 	}
 	publish(controlRoute, controlBody(t, "stop-after-sip", "stop", ""))
 	select {