- Add `bd mail send/inbox/read/ack` commands for inter-agent messaging
- Implement GetIdentity() with priority chain: flag > BEADS_IDENTITY env > config.yaml > git user.name > hostname
- Messages are stored as issues with type=message for git-native communication
- Support both daemon and direct mode for all mail operations
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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