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
3a38f06eb8Julius Marminge committed on 9/5/2026, 4:54:16 AMparentd17cd9b
7 files changedLine totals unavailable