feat(config): add fallback_models for model availability fallback#1237

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youming-ai wants to merge 7 commits intocode-yeongyu:devfrom

youming-ai:feat/fallback_models-restored

Commits on Jan 31, 2026

feat(config): add fallback_models model selection
youming-ai
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fix(test): avoid real connected providers cache
youming-ai
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fix: prevent category model from overwriting resolved fallback model and update test expectations

youming-ai
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sisyphus-dev-ai
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style(model-resolver): renumber resolution steps sequentially

youming-ai
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sisyphus-dev-ai
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test(model-resolver): add edge case tests for fallback_models

youming-ai
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sisyphus-dev-ai
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feat(runtime-fallback): implement automatic model switching on API errors

youming-ai
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sisyphus-dev-ai
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docs: update runtime_fallback documentation to reflect implementation

youming-ai
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sisyphus-dev-ai
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