Add crew/ directory support to rig structure for user-managed
persistent workspaces. Crew workers are separate from polecats
(AI-managed) and can have optional custom BEADS_DIR configuration.
- Add internal/crew package with Worker type and Manager
- Update rig types to include Crew slice and CrewCount in summary
- Update rig manager to scan for crew workers
- Add crew/ to AgentDirs for rig initialization
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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