fix(tests): stabilize escalation SSE backend tests

Co-Authored-By: Codex <noreply@openai.com>

backend/tests/test_handoff_manager.py

@@ -9,6 +9,26 @@ from app.models.user import User
 from app.services.handoff_manager import HandoffManager
 
 
+@pytest.fixture(autouse=True)
+def stub_ai_assessment():
+    """Keep handoff tests focused on handoff behavior, not external AI calls."""
+    with patch.object(
+        HandoffManager,
+        "_generate_ai_assessment",
+        new=AsyncMock(
+            return_value=(
+                "Stub escalation assessment",
+                {
+                    "likely_cause": "Stub",
+                    "suggested_steps": [],
+                    "confidence": "medium",
+                },
+            )
+        ),
+    ):
+        yield
+
+
 @pytest.mark.asyncio
 async def test_create_park_handoff(client: AsyncClient, test_user, auth_headers, test_db):
     """Parking a session creates a handoff with snapshot."""