Update agent.py

agent.py

@@ -200,5 +200,5 @@ class HybridLangGraphMultiLLMSystem:
         answer_part = parts[1].strip() if len(parts) > 1 else raw_answer.strip()
         return answer_part
 
-def build_graph():
+def build_graph(provider:None):
     return HybridLangGraphMultiLLMSystem().graph