test: add e2e test suite and fix namespace/mention/assignee flags

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

service/node_service_impl.go

@@ -324,18 +324,15 @@ func (s *nodeServiceImpl) ListUsers() ([]*models.Node, error) {
 // --- Internal helpers ---
 
 func (s *nodeServiceImpl) checkBlockers(id string) error {
-	node, err := s.store.GetNode(id)
+	// Find all nodes that declare a blocks → id relation (i.e., open blockers).
+	blockers, err := s.store.FindNodes(nil, []*models.Rel{{Type: models.RelBlocks, Target: id}})
 	if err != nil {
 		return err
 	}
 	var blocking []string
-	for _, bID := range node.Relations()[string(models.RelBlocks)] {
-		blocker, err := s.store.GetNode(bID)
-		if err != nil {
-			return err
-		}
-		if blocker.GetProperty("status") == "open" {
-			blocking = append(blocking, bID)
+	for _, b := range blockers {
+		if b.GetProperty("status") == "open" {
+			blocking = append(blocking, b.ID)
 		}
 	}
 	if len(blocking) > 0 {