- Show unread mail count and first message subject for each agent
- Display format: "mail: 📬 N unread → Subject..."
- Only shows mail line when agent has unread messages
- Fix agent bead ID generation for global agents (mayor/, deacon/)
Example output:
🏭 Refinery
gt-refinery-gastown running
hook: refinery Handoff
mail: 📬 8 unread → MERGE_READY morsov
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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