Grok Build only. Turn a 2D character still into denser animation sprites via image_gen/image_edit base → image_to_video (6s/10s run-in-place) → ffmpeg frames → magenta chroma-key → dense sampled strips/grids/GIFs. Use when the user wants video-to-sprite, smoother run/walk cycles, or denser intermediate poses. Prefer generate2dsprite for crisp production pixel sheets. Triggers on "video to sprite", "image_to_video sprite", "dense walk cycle", "smooth run animation from video".
