- Add CreatedBy field to Issue struct (matches beads GH#748)
- Add Actor field to CreateOptions, pass --actor to bd create
- Add ActorString() method to RoleInfo for identity formatting
- Update all beads.Create() callers to pass Actor
- Update direct bd create exec calls with --actor:
- mail/router.go: uses sender identity
- patrol_helpers.go: uses role name
- doctor/patrol_check.go: uses "gt-doctor"
- rig/manager.go: uses "gt-rig-init"
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>