Update app.py

app.py

@@ -20,8 +20,7 @@ You are a general AI assistant. I will ask you a question. Report your thoughts,
 class BasicAgent:
     def __init__(self):
         print("BasicAgent initialized.")
-        graph = build_graph()
-        
+        self.graph = build_graph()
 
     def __call__(self, question: str, task_id: Optional[str] = None) -> str:
         """Run the agent and return whatever FINAL_ANSWER the graph produces."""