feat(agent): migrate to native CrewAI tool loop and async resume enqueue

backend/tests/integration/test_users_routes.py

@@ -134,7 +134,7 @@ def test_patch_me_validation_error_returns_problem_details() -> None:
         assert response.status_code == 422
         assert response.headers["content-type"].startswith("application/problem+json")
         body = response.json()
-        assert body["title"] == "Unprocessable Content"
+        assert body["title"] in {"Unprocessable Content", "Unprocessable Entity"}
         assert body["status"] == 422
     finally:
         app.dependency_overrides = {}