feat: add model rotation for automatic failover on quota/rate limits#929

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TheSmuks wants to merge 12 commits intocode-yeongyu:devfrom

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Commits on Jan 19, 2026

feat: add model rotation for automatic failover on quota/rate limits
TheSmuks
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fix(agents): handle empty model overrides and optional default model

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sisyphus-dev-ai
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fix(model-rotation): correct error parsing for overload and OpenAI rate limits

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sisyphus-dev-ai
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fix(model-rotation): record token usage and resolve config dir for state

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sisyphus-dev-ai
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fix(model-rotation): avoid rotating to current model and reset cooldowns

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sisyphus-dev-ai
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fix(model-rotation): classify OpenAI insufficient_quota as quota

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sisyphus-dev-ai
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test(model-rotation): cover cooldown expiration and self-rotation

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sisyphus-dev-ai
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fix(model-rotation): trigger rotation on anthropic overloaded_error
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fix(agents): allow orchestrator-sisyphus when only override model exists
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fix(model-rotation): dedupe usage recording for streaming message.updated
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fix(model-rotation): implement true round-robin model selection
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fix(model-rotation): reset usage counters when cooldown expires
TheSmuks
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