Generate text-driven skeletal animations for an already-rigged 3D model. Pass the rigged GLB in `model` (URL or base64; the 3D asset file, not an AI model name) and a motion `prompt` (e.g. "walking", "swinging its axe"). The model must already have a skeleton - rig it first with rigModel if not. The job result is num_variants candidate animations (default 4), each a standalone animation-only GLB (skeleton + one clip, no mesh) in `glb_url` plus an mp4 `preview_url`, so you can pick the best one and fuse it with your model in a game engine or three.js. mode selects the representation - rot_trans (default, rotation plus translation per bone, most faithful) or rot_only (rotation only, easier to retarget onto another skeleton in an engine). Animation quality is hit-or-miss, which is why multiple candidates are returned. Credits are held once per call regardless of variant count and refunded if the job fails or is cancelled. 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).