Edit a previously generated spritesheet: re-prompt its underlying animation (edit_mode "prompt"), extend the frame beyond its borders ("outpaint"), or repair a bad loop ("fix_loop"). Pass the `spritesheet_url` you received from `animateSprite`, `animateSpriteKeyframes`, `transferMotion`, or an earlier edit - it must be a spritesheet you generated within the last 7 days; arbitrary external images are not accepted. Omit `duration`, `frames`, `frame_size`, `crop` and `model` to keep the source spritesheet's values. A `prompt` is required for edit_mode "prompt", optional for "outpaint", and not accepted for "fix_loop"; optionally add up to 5 reference `images` (URL or base64) to guide the edit. The job result is the same result shape as animateSprite (spritesheet URL, frame layout, optional GIF or individual frames). Credits are held when the job is accepted; the final charge is max(rate × produced seconds, the model's minimum charge), never more than for the duration you requested, and the difference (or everything, if the job fails or is cancelled) is refunded. Prompt edits are priced per model (credits/second × duration); "outpaint" and "fix_loop" run a lighter pipeline in which `model` is ignored and are billed at a flat 1 credit per second of the output duration (the source spritesheet's duration unless you pass one). Outpaint decides the extra margin itself - there is no amount parameter. The result carries the same fields as animateSprite (`spritesheet_url`, `video_url`, grid fields); audio is generated only by prompt edits on hydra, so a fix on a hydra sheet comes back without `audio_url`. Pass an optional `request_id` to tag the result for later retrieval via listGenerations (type spritesheet). Requires an API key (user scope). The call returns 202 with a job id - poll getApiJob (pass wait 30 to long-poll) honouring poll_after_ms, until status is succeeded; its result field is exactly the response documented for this operation. Synchronous responses are deprecated but still supported: pass `async: false` to block until the result is ready and receive it as the response body. Synchronous calls run on the same queue: the response carries an X-Ludo-Job-Id header, and a job still running after 15 minutes comes back as 202 with the job instead of an error. Each account may have up to 50 generations queued or running at once via the API; a request beyond that returns 429 (code PENDING_JOBS_LIMIT).