Add async gates - coordination primitives for agents to wait on external events
like CI completion, PR merges, timers, or human approval.
Changes:
- Add 'gate' issue type to types.go with gate-specific fields:
- AwaitType: condition type (gh:run, gh:pr, timer, human, mail)
- AwaitID: condition identifier
- Timeout: max wait duration
- Waiters: mail addresses to notify when gate clears
- Add SQLite migration 027_gate_columns for new fields
- Update all SQLite storage queries to handle gate fields
- Add bd gate commands: create, show, list, close, wait
- All commands support --json output and --no-daemon mode
Closes: bd-2v0f, bd-lz49, bd-u66e
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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