Request one export from an owned schedule

Available only when the account reports manual_run_available: true. Queues one export for the private worker; acceptance does not mean processing or delivery has completed. A one-off request can use a paused schedule and does not advance its recurring calendar. Both the schedule credential and requester must remain authorized for the selected data. Use one printable ASCII Idempotency-Key without spaces or commas, and reuse it after any uncertain response. A retry returns the original request, including its recorded failed or completed status. It never applies later schedule edits to the accepted request. An active schedule request prevents a second request until its final result. The replay receipt stays while work is unresolved and, after completion, for at least 30 days or the accepted output retention period, whichever is longer. A retained receipt whose completed output has been removed, is being deleted, or has expired returns 410 without restarting it. After the receipt itself expires, a request may be new; keep retries within 30 days of submission or deliberately start a new request. No verification credits are spent by this request. Completed means accepted by the delivery provider, not confirmed receipt in a mailbox.