Reuse persisted cwd when recovering stale provider sessions

- Read and validate `cwd` from persisted runtime payload when restarting sessions
- Apply persisted `cwd` during stale-session recovery paths, including `sendTurn`
- Add tests to verify resumed sessions preserve the original working directory
2aad749e24Julius Marminge committed on 2/28/2026, 4:58:21 AMparentaa267eb
2 files changedLine totals unavailable