- Move all CreateInboxItem calls from handlers to centralized inbox_listeners.go
- Enrich issue:updated payload with change context (assignee_changed, status_changed, prev values)
- Enrich comment:created payload with issue context (assignee info)
- Bus listeners handle: issue assign, unassign, reassign, status change, comment notification
- ListAgents filters private agents: only visible to owner_id or workspace admin
- Zero CreateInboxItem calls remain in handler package
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>