Fix Groq model - update to current llama3-8b-8192

agent.py

@@ -169,7 +169,7 @@ def build_graph(provider: str = "google"):
         llm = ChatGoogleGenerativeAI(model="gemini-2.0-flash", temperature=0)
     elif provider == "groq":
         # Groq https://console.groq.com/docs/models
-        llm = ChatGroq(model="qwen-qwq-32b", temperature=0) # optional : qwen-qwq-32b gemma2-9b-it
+        llm = ChatGroq(model="llama3-8b-8192", temperature=0) # Current stable model
     else:
         raise ValueError("Invalid provider. Choose 'google' or 'groq'.")