Update app.py

app.py

@@ -221,7 +221,7 @@ compiled_graph = graph.compile()
 
 # ─────────────────────────── Public API  ────────────────────────────────
 
-def answer(question: str, *, task_id: Optional[str] = None) -> str:
+def answer(question: str, task_id: Optional[str] = None) -> str:
     """Run the agent and return whatever FINAL_ANSWER the graph produces."""
     init_state = AgentState(question, task_id)
     init_state.add(SystemMessage(content="You are a helpful assistant."))