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108895fc04
Follow-up review found two real framing hazards in the handler-layer framer: it could flush a partial `data:` payload before the JSON was complete, and it could inject an extra newline before chunks that already began with `\n`/`\r\n`. This commit tightens the framer so it only emits undelimited events when the buffered `data:` payload is already valid JSON (or `[DONE]`), skips newline injection for chunks that already start with a line break, and avoids the heavier `bytes.Split` path while scanning SSE fields. The regression suite now covers split `data:` payload chunks, newline-prefixed chunks, and dropping incomplete trailing data on flush, so the original Responses fix remains intact while the review concerns are explicitly locked down. Constraint: Keep the follow-up limited to handler-layer framing and tests Rejected: Ignore the review and rely on current executor chunk shapes | leaves partial data payload corruption possible Rejected: Build a fully generic SSE parser | wider change than needed for the identified risks Confidence: high Scope-risk: narrow Reversibility: clean Directive: Do not emit undelimited Responses SSE events unless buffered `data:` content is already complete and valid Tested: /tmp/go1.26.1/go/bin/go test ./sdk/api/handlers/openai -count=1 Tested: /tmp/go1.26.1/go/bin/go test ./sdk/api/handlers -count=1 Tested: /tmp/go1.26.1/go/bin/go vet ./sdk/api/handlers/... Not-tested: Full repository test suite outside sdk/api/handlers packages