Switch Codex provider checks to app-server probe

- Use codex app-server snapshots for auth, models, and skills
- Remove legacy CLI/config discovery paths and related helpers
- Update tests for the new provider status flow
7d1ff5394dJulius Marminge committed on 9/1/2026, 4:23:36 AMparent5473680
8 files changedLine totals unavailable