Animating with code

You write the drawing; a headless browser (or PIL, cairo, ffmpeg) renders it. The method below comes from the ClaudeAnimationBase kit's guide and holds for any renderer. The kit itself is the fastest route to a hand-painted character short.

Before building, name the route and why (Oskar's standing steer, memory 06886186): the kit, a CSS/HTML page captured frame by frame, a pure ffmpeg filtergraph, or PIL/cairo frames.

The contract: frames are pure functions of t