tools

Script	What
`build`	What `wrangler` runs before serving or uploading: the Worker, and the preview when stale.
`preview`	previewgen, then resvg, then ffmpeg: `card.png` and `loop.mp4` (and a stamp of what they were drawn from), byte-for-byte reproducible.
`preview-hash`	One hash of everything the preview is drawn from (sources, the shared look, the default mascot). `preview` stamps it beside the files; `build` and `check-preview` compare it, so a stale card is caught by content, not file times.
`check-preview`	Validates those files (PNG size; MP4 H.264, yuv420p, even sides, declared size, faststart, silent, short, under 4 MB). Proven to fail on a bad file.

Run them through mise: mise run web:dev (which runs build), mise run web:preview, mise run web:check-preview.