- internal/mail: Message types with priority support
- internal/mail: Mailbox JSONL operations (list, get, append, delete)
- internal/mail: Router for address resolution and delivery
- gt mail send: Send messages to agents
- gt mail inbox: List messages (--unread, --json)
- gt mail read: Read and mark messages as read
- Address formats: mayor/, rig/, rig/polecat, rig/refinery
- High priority messages trigger tmux notification
- Auto-detect sender from GT_RIG/GT_POLECAT env vars
Closes gt-u1j.6, gt-u1j.12
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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