Add delivery modes to mail messages:
- queue (default): message stored for periodic checking
- interrupt: inject system-reminder directly into session
New features:
- --interrupt flag on gt mail send for urgent/lifecycle messages
- --quiet flag on gt mail check for silent non-blocking checks
- gt mail wait command to block until mail arrives (with optional timeout)
Interrupt delivery injects a system-reminder via tmux send-keys,
useful for stuck detection, nudges, and urgent notifications.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
6479dddb9b