- Changed `check_authorized` in `scripts/telegram_deploy_bot.py` to fail closed (deny all) if `TELEGRAM_ALLOWED_USER_IDS` is unset or empty.
- Updated `scripts/TELEGRAM_BOT_SETUP.md` and `QUICK_DEPLOY.md` to document that `TELEGRAM_ALLOWED_USER_IDS` is now mandatory for bot access.
- Added Sentinel Journal entry in `.jules/sentinel.md` documenting the vulnerability and learning.
- Verified fix with reproduction script.
