Add refresh command to poe bot for manual git pull and broadcast
Adds a new command (refresh/pull/sync/update) that can be triggered via
DM to the bot. The command:
1. Pulls latest changes from remote (git pull --ff-only)
2. Regenerates changelog (monopam changes --daily --aggregate)
3. Broadcasts new changes to the configured channel
This allows manual triggering of the same flow that runs in the polling
loop, useful for immediate updates without waiting for the next interval.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>