- Sync all 11 dedicated model templates from the upstream Codex catalog
- Preserve official context windows, prompts, capabilities, and reasoning levels
- Remove the custom Spark and DeepSeek dedicated templates
- Move fallback model metadata into a standalone embedded resource
- Prevent remote catalogs and local caches from overriding fallback configuration
- Add catalog revision checks to prevent older templates from replacing newer ones
- Keep Fast mode available for both dedicated and fallback models
- Add regression coverage for Astra generation, catalog revisions, and fallback isolation
Validation: all 332 backend tests pass.
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