Keep Google service enabled when token mount is read-only

token.json is mounted :ro, so writing refreshed creds back raised
PermissionError at startup once the stored access token expired. The broad
except in agents.py then disabled Calendar and Gmail tools entirely.
Keep the refreshed creds in memory when the write fails.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

utils/google_service.py

@@ -25,8 +25,11 @@ class GoogleService:
         creds = Credentials.from_authorized_user_file(token_path, SCOPES)
         if creds.expired and creds.refresh_token:
             creds.refresh(Request())
+            try:
                 with open(token_path, "w") as f:
                     f.write(creds.to_json())
+            except OSError:
+                pass  # read-only mount; refreshed creds live in memory
         self._creds = creds
 
         self._calendar = build("calendar", "v3", credentials=creds)