- Guarded the `all_turns` reasoning context value to OpenAI models version 5.4 or greater.
- Suppressed `reasoning.context` defaults and explicit overrides when `all_turns` is requested on unsupported models to prevent server rejection.
- Introduced `supportsAllTurnsReasoningContext` helper in `@oh-my-pi/pi-catalog/identity` using semver classification.
- Updated request-transformer and response-options logic to conditionalize the request payload shaping.
- Expanded test coverage to verify correct fallback behavior and explicit overrides across gpt-5.x versions.
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