Implement reusable name pool for polecat workers:
- Pool of 50 names (polecat-01 through polecat-50)
- Prefers lower-numbered slots for allocation
- Overflow uses rigname-N format when pool exhausted
- Pool names are reusable, overflow names are not
- State persisted to .gastown/namepool.json
Changes:
- Add NamePool type with Allocate/Release/Reconcile
- Integrate with polecat.Manager (auto-loads/saves)
- Update gt spawn to use AllocateName() from pool
- Remove legacy polecatNames list and generatePolecatName()
- Add comprehensive tests for name pooling
Benefits:
- Tmux sessions survive polecat restarts (same name)
- Users can stay attached and see work continue
- Bounded resource usage for common case
- Scales beyond 50 with overflow naming
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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