update to agent invokation based on langgraph

app.py

@@ -17,14 +17,14 @@ langfuse_handler = CallbackHandler()
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 # --- Basic Agent Definition ---
-# ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------     
+# ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------         
 class BasicAgent:
     def __init__(self):
         self.agent = build_graph()
         print("BasicAgent initialized.")
     async def aquery(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
-        response = await self.agent.run_query(question, config={"callbacks": [langfuse_handler]})
+        response = await self.agent.invoke(question, config={"callbacks": [langfuse_handler]})
         print(f"Agent returning fixed answer: {response}")
         return response