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check rw.err in streamingResponseWriter.Write on go1.27

json/v2 rejects invalid UTF-8 in headers, which makes the prelude marshal
fail. Write ignored the error and wrote the body where the prelude belongs,
letting the body control the response status, headers and cookies.
Return the error instead, as the v1 implementation does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>