feat: detect always-thinking models and surface them as always-on in the model selector#613

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MoonshotAI:mainfrom

7Sageer:feat-always-thinking-capability

Commits on Jun 11, 2026

feat: detect always-thinking models and surface them in capabilities
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fix: keep detected capabilities runtime-only and additive
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refactor: resolve model capabilities at read time via a shared resolver
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refactor: unify the Fable predicate and tighten always_thinking typing
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fix(acp): suppress the thinking toggle for always-thinking models
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fix: harden capability-resolution boundaries
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test: use neutral fixture names for declared-capability cases
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