Run an Architect turn (Responses)

OpenAI Responses over one turn of the Architect on a project, with the same authentication, project header, models and files as chat completions. input is a string or message items, with input_text, input_image and input_file parts; instructions are instructions for this turn. The output is the reply as message items and the readable reasoning as reasoning items with summary_text parts. A turn that changed the scene is saved as one named version: metadata.pascal_version, pascal_version_label and pascal_version_url, and a url_citation annotation at the end of the reply. A turn that asked a question has metadata.pascal_waiting: "question"; the next request answers it (1, 2… picks an option). metadata.commit_message names the version; metadata.pascal_max_credits caps the credits the turn may spend, and a turn that reaches it ends incomplete (incomplete_details.reason: "max_credits"). previous_response_id continues the project’s conversation and must belong to the project’s active conversation. With stream: true the response is a text/event-stream of Responses events (response.created through response.completed, response.incomplete or response.failed), with : keepalive comments during silences. Without stream, the headers leave within 15 s and spaces keep the connection open until the JSON body. A turn that fails after it started answers 200 with status: "failed" ("cancelled" once stopped): it is never retried, since it may already have edited the scene. A synchronous request follows its turn for at most 13 minutes: a turn still running then is stopped (status: "failed"), except an architect-pro turn, which runs on and answers status: "in_progress" (a stream ends with an error event, turn_still_running): poll GET /api/v1/responses/{id}. A turn that may run longer is sent with background: true, at any model: the request answers status: "queued" at once, the turn runs to its end with nobody following (credits charged and the version saved as for a followed turn), and GET /api/v1/responses/{id} reads it; POST /api/v1/responses/{id}/cancel stops it.