layer1: formalize namespace removal strategy

pkg/utils/namespace_manager_test.go

@@ -357,13 +357,32 @@ func TestHandleWatcherNamespaceAddUpdateDelete(t *testing.T) {
 		t.Fatalf("expected update handler to dispatch resync")
 	}
 
-	HandleWatcherNamespaceDelete(logger, "router.NSWatcher", manager, k8sCache.DeletedFinalStateUnknown{Obj: namespace})
+	HandleWatcherNamespaceDelete(context.Background(), logger, "router.NSWatcher", manager, k8sCache.DeletedFinalStateUnknown{Obj: namespace}, NamespaceRemovalStrategyTrackOnly)
 	record, ok := manager.Get("tenant-a")
 	if !ok || record.Phase != NamespacePhaseRemoved {
 		t.Fatalf("expected delete handler to mark namespace removed")
 	}
 }
 
+func TestHandleWatcherNamespaceRemovalDispatch(t *testing.T) {
+	manager := NewNamespaceManager()
+	router := &testNamespaceSubscriber{name: "router"}
+	manager.Subscribe(router)
+	logger := zap.NewNop()
+	namespace := &corev1.Namespace{}
+	namespace.Name = "tenant-a"
+	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
+
+	HandleWatcherNamespaceRemoval(context.Background(), logger, "router.NSWatcher", manager, namespace, NamespaceRemovalStrategyDispatchRemove)
+	record, ok := manager.Get("tenant-a")
+	if !ok || record.Phase != NamespacePhaseRemoved {
+		t.Fatalf("expected dispatch removal to keep removed record")
+	}
+	if router.removeCalls != 1 {
+		t.Fatalf("expected remove subscriber to be called once")
+	}
+}
+
 func TestNamespaceManagerDispatchAdd(t *testing.T) {
 	manager := NewNamespaceManager()
 	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})