- Add --assignee flag to `bd template instantiate` for work delegation
- Assigns the root epic to specified agent/user
- Child issues retain their template-defined assignees
- Enables Gas Town orchestration: instantiate + assign in one step
- Add missing --identity flag to `bd mail inbox` for consistency
- All mail subcommands now support --identity override
- Delete obsolete HANDOFF-template-redesign.md (work complete)
- Add test for assignee override behavior
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>