feat: add polecat lifecycle management
Types:
- Polecat: worker agent with state, clone, branch, issue
- State: idle/active/working/done/stuck
- Summary: concise status view
Manager operations:
- Add: clone rig, create branch, init state
- Remove: delete polecat (checks for uncommitted changes)
- List: enumerate all polecats
- Get: retrieve specific polecat
State management:
- SetState: update lifecycle state
- AssignIssue: assign work (sets StateWorking)
- ClearIssue: remove assignment (sets StateIdle)
- Wake: idle → active
- Sleep: active → idle
State persisted to polecats/<name>/state.json
Closes gt-u1j.8
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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