feat: migrate chat orchestration to deep langgraph workers

tests/test_memory_middleware.py

@@ -250,15 +250,14 @@ def test_home_request_calls_memory_middleware(client):
     token = make_jwt("power", user_id=USER_ID)
     session_id = str(uuid.uuid4())
 
-    async def _mock_stream(user_id, message, context, reg=None):
+    async def _mock_stream(user_id, message, context):
         # Verify memory context was injected
         assert context.get("core_memory") == {"tz": "UTC"}
-        yield "task_agent", ""
-        yield "task_agent", '{"type": "text", "content": "Done"}'
+        yield "token", "Done"
 
     with (
         patch("app.api.routes.device_ws.MemoryMiddleware", _MockMiddleware),
-        patch("app.api.routes.device_ws.orchestrate_v3_stream", side_effect=_mock_stream),
+        patch("app.api.routes.device_ws.run_home_stream", side_effect=_mock_stream),
     ):
         with client.websocket_connect(f"/api/v1/ws/device?token={token}") as ws:
             ws.send_text(json.dumps({