Mail is orchestration, not data plane. The bd mail commands were just
sugar over bd create/list/show with type=message. Gas Town (gt) now
owns mail routing and delivery.
Removed:
- cmd/bd/mail.go - all mail subcommands (send, inbox, read, ack, reply)
- cmd/bd/mail_test.go - mail command tests
- docs/messaging.md - dedicated mail documentation
- EventMessage hook - no longer triggered
Kept (data plane):
- type=message as valid issue type
- Sender, Ephemeral fields on issues
- replies_to dependency type for threading
Coordination: gt-9xg implements native mail in Gas Town.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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