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## What changed - Build Responses Lite base instructions through a dedicated context fragment so the developer message carries the `model.base_instructions` content kind. - Apply provider metadata cleanup after adding the base-instructions message, preserving the existing behavior for non-OpenAI providers. ## Testing - Extend Responses Lite request coverage to verify the annotation is present for OpenAI requests and omitted for a third-party provider. GitOrigin-RevId: b0317f92dfb9570860688b49e3a7668da516ee8c