ReconcilePool now detects and kills orphan tmux sessions (sessions without
corresponding polecat directories). This prevents allocation from being
blocked by broken state from crashed polecats.
Changes:
- Add tmux to Manager to check for orphan sessions during reconciliation
- Add ReconcilePoolWith for testable session/directory reconciliation logic
- Always clear hook_bead slot when reopening agent beads (fixes stale hooks)
- Prune stale git worktree entries during reconciliation
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>