fix(orchestration): recreate missing worktrees before turns

Prune stale git worktree registration and recreate the saved branch at the saved path before provider startup. Recovery remains best effort so normal provider errors still report when repair is impossible.

Finding: R10

Implemented by GPT-5.6 Sol in Codex.
1cf9ac936aJulius Marminge committed on 9/1/2026, 4:32:52 AMparenta6ad75b
11 files changedLine totals unavailable