- Add `bd gate add-waiter <gate-id> <waiter>` command to register
agents as waiters on a gate bead using the native Waiters field
- Add `bd gate show <gate-id>` command to display gate details
including waiters (used by gt gate wake)
- Add Waiters field to UpdateArgs in RPC protocol
- Update server to handle waiters field in updates
This is part of the polecat phase handoff feature (bd-quw1).
The corresponding gastown changes (gt done --phase-complete) are
tracked separately.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>