- Align fallback defaults and instruction structure with upstream Codex while preserving Fast availability for all models
- Stop forcing fallback reasoning levels or inferring original-image support
- Sync managed catalogs on model refresh, configuration changes, and every 30 seconds
- Remove unavailable models, replace missing defaults, and handle empty-list recovery
- Preserve existing configuration on request failures or invalid responses
- Serialize refreshes, update UI model lists, and preserve backups across restarts
- Add regression coverage for fallback compatibility, stale-model cleanup, and configuration recovery
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