- Fix operation order: write live files first, then save config.json for consistency
- Implement short-lock pattern: read state quickly, release lock before I/O operations
- Add atomic Codex dual-file writes with rollback on failure
- Simplify add_provider and update_provider logic with consistent structure
- Remove unnecessary duplicate code and improve error handling reliability
This ensures data consistency when operations fail and significantly improves concurrency by minimizing lock holding time during file I/O.