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.
846906b60bJulius Marminge committed on 9/5/2026, 4:54:27 AMparentae84cc4
11 files changedLine totals unavailable