v1.2.0

- Optional update-notification check (daily/startup GitHub Releases
  check, DMs the app owner once per version; MERRYN_UPDATE_CHECK=off
  to disable)
- Minutes archive posts the full text as searchable chat messages
  alongside the .md file, not just an embed digest
- Pre-meeting reminder ping for /meeting schedule
  (MEETING_REMINDER_LEAD_MINUTES)
- Optional /second motion-seconding requirement
- /remind personal reminders