Runs a FrameOS scene in your browser through the WebAssembly runtime, with the same state fields, event
buttons, and logs the frame itself exposes. Paste the contents of a scenes.json (from a template
zip, a backup, or an export) and press start. Serve this file over HTTP with the runtime assets next to it —
for example: npx serve node_modules/frameos-wasm and open /index.html.