Implements Do Not Disturb mode for Gas Town agents:
- Add notification_level to agent bead schema (verbose, normal, muted)
- gt dnd [on|off|status] - quick toggle for DND mode
- gt notify [verbose|normal|muted] - fine-grained control
- gt nudge checks target DND status, skips if muted
- --force flag on nudge to override DND
This allows agents (especially Mayor) to mute notifications
during focused work like swarm coordination.
Generated with Claude Code
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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