Update project files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/schemas.py

@@ -222,6 +222,7 @@ class StatsResponse(BaseModel):
     requirements: int
     sub_requirements: int
     leaves: int
+    orphaned: int
     by_status: dict[str, int]
     by_priority: dict[str, int]
     quality_passing: int