Enforce authenticated user verification on startup in main.py

main.py

@@ -58,6 +58,15 @@ async def main() -> None:
 
     # Initialize Gitea components
     client: GiteaClient = GiteaClient()
+    try:
+        user = client.get_authenticated_user()
+        if not user or not user.login:
+            raise RuntimeError("No authenticated user found.")
+        logger.info(f"Authenticated as user: {user.login}")
+    except Exception as e:
+        logger.critical(f"Critical initialization error: No authenticated user found. {e}")
+        raise SystemExit(1)
+
     tools: GiteaTools = GiteaTools(client)
     model_name: str = AGENT_MODEL_ID