responses.create cannot stream #15

responses.create has no stream argument, so the SDK cannot stream /v1/responses. The docs send streaming callers to the OpenAI SDK.

The gateway streams Responses events. For OpenAI channels the upstream event stream is passed through. For other providers the gateway builds the events itself (response.created, response.output_item.added, response.content_part.added, response.output_text.delta, ... response.completed) and ends with data: [DONE].

Fix: responses.create(stream=True) (sync and async) sends "stream": true and returns a Stream[ResponseStreamEvent].

• Events keep their type and all fields.
• The stream ends at [DONE], or at the end of the body when there is no [DONE].
• An error event raises APIError.

The gateway's own events do not yet carry sequence_number or item_id, so those fields are optional.

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