fix(structured outputs): avoid including beta header if output_format is missing
#1121
+4
−6
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Third-party clients (Vertex, Bedrock) don’t support structured outputs and its beta header, so when the SDK sets it, the remote server returns
Error code: 400 - {'message': 'invalid beta flag'}.This change just avoids always setting that header, so we can still port the
tool_runnerandstreamhelpers, which useparsemethod internally, with minimal changes.