- Add Actor field to MutationEvent struct
- Use new assignee from update args instead of old issue state
- Include actor (who performed the action) in mutation events
- Display actor in bd activity output, falling back to assignee
When pinning/updating status, the activity feed now shows who performed
the action (e.g., "@gastown/crew/jack") instead of showing nothing.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>