优化流程

backend/app/cad_agent/composition.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+import shutil
 
 from app.cad_agent.adapters.artifact_store import FileArtifactStore
 from app.cad_agent.adapters.event_publisher import IdempotentInProcessPublisher
@@ -30,6 +31,10 @@ class V3Services:
 
 def compose_v3(settings: Settings) -> V3Services:
     repository = SqliteTaskRepository(settings.task_root.parent / "autonomous-cad-v3.sqlite3")
+    if repository.protocol_reset and settings.task_root.exists():
+        # Protocol 3.1 has no valid interpretation for structured-only task
+        # artifacts, so clear that task root together with its old database.
+        shutil.rmtree(settings.task_root)
     artifacts = FileArtifactStore(settings.task_root)
     runtime = ProfileCadRuntime(settings)
     registry = default_registry()