Recover one failed private video job

Requires a signed-in user JWT with images:generate and exact ownership of the failed private keyframe job. The original Higgsfield status must be remotely confirmed as failed and not moderated or invalid_request. The request body may be omitted or be an empty JSON object; Idempotency-Key is required. At most one fixed Fal Seedance 2.5 image-to-video child is reserved for the exact original settings. An ambiguous submit is fenced and never automatically resubmitted. Replays poll only the saved queue handle; the parent job is unchanged. The response contains only a closed recovery state and child job ID; use the normal scoped GET job route for authorized private output.