sync model validation with cli catalog

tradingagents/llm_clients/google_client.py

@@ -36,6 +36,7 @@ class GoogleClient(BaseLLMClient):
 
     def get_llm(self) -> Any:
         """Return configured ChatGoogleGenerativeAI instance."""
+        self.warn_if_unknown_model()
         llm_kwargs = {"model": self.model}
 
         for key in ("timeout", "max_retries", "google_api_key", "callbacks", "http_client", "http_async_client"):