Update LangGraphAgent to use ChatGoogleGenerativeAI

agent.py

@@ -3,7 +3,7 @@ from typing import Optional
 
 from langgraph.graph import StateGraph, START, END, MessagesState
 from langchain_core.messages import HumanMessage, AIMessage, SystemMessage
-from langchain_google_genai import ChatGoogleGenAI
+from langchain_google_genai import ChatGoogleGenerativeAI
 from langgraph.prebuilt import ToolNode
 from pydantic import Field, SecretStr  # add
 
@@ -74,7 +74,7 @@ class LangGraphAgent:
 
         # Choose an LLM if not provided
         if model is None:
-            model = ChatGoogleGenAI(
+            model = ChatGoogleGenerativeAI(
                 model="gemini-2.5-flash",
             )
             if model is None and ChatOpenAI is not None: