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feat(coding-agent,runtime): rebase minimal runtime extensions on upstream 0.9.3
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packages/ai/.changes/structured-output-response-format.md
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  • Added responseFormat to request schema-constrained JSON output, implemented for Google, Google Vertex (responseMimeType plus responseJsonSchema), and OpenAI-compatible completions (response_format: { type: "json_schema" }). The completions path is enabled for endpoints known to support it and opt-in per model with compat.supportsResponseFormatJsonSchema for providers such as DeepSeek and z.ai that reject or ignore the field.
  • Added responseFormat schema normalization that sends TypeBox literal unions as enum, because provider structured-output dialects do not accept const: Gemini ignores it and would accept any value, and OpenAI rejects the schema.