Editing and errors
Use POST /creations/{creation_id}/edit.
Scene editing
{ "action": "update_scene_narration", "scene_id": "section_2", "narration_text": "Updated narration"}
Use regenerate_scene to rebuild one scene. Read editable_actions and scenes[] first.
AI Video iteration
Only use this when the catalog or detail exposes conversational editing:
{ "action": "iterate", "prompt": "Keep the camera motion and make the lighting warmer"}
KPainter keeps the Omni interaction cursor on the server. Do not send previous_interaction_id. Veo does not support iterate; create a new result instead.
