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## Why Using Responses Lite does not establish whether a model accepts reasoning-effort `configuration_update` items. Unsupported models need to use the selected request-level effort, including when resuming history containing saved updates. ## What changed - Add `supports_reasoning_effort_updates` model metadata, defaulting to `false`. - Require the override feature, an OpenAI provider, and explicit model support for reasoning effort updates, independently of `use_responses_lite`. - Filter saved configuration updates from unsupported requests without changing persisted history. - Clear the pinned effort baseline when sampling with an unsupported model so returning to a supported model establishes a fresh baseline. Compaction uses the selected effort without clearing the pin. ## Testing Add coverage for supported models with either Responses mode, unsupported-model history filtering over HTTP and WebSocket, switching to an unsupported model and back, and compaction versus sampling pin behavior. Verify missing capability metadata defaults to `false`. GitOrigin-RevId: 8a0fbc141964bd854dbcdd6f31e1c8e97697cf22