- Added MockResponse metadata fields and invoked onResponse pre-stream with lowercased headers, status fallback, and requestId.
- Wrapped request onResponse in agent-loop, captured response headers, and forwarded them with baseUrl to finish/fail span handling.
- Added detectGatewayFromHeaders export and pi.gen_ai.gateway.* span attributes via header-based gateway detection.
- Extended telemetry event/span payloads with responseHeaders and validated detection-priority and onResponse forwarding in tests.
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