unthrown branding

The illustrated mascot is a pink beet with a no-throw sign, part of the shared btravstack beet family. Its editable source is scripts/generate-brand.mjs in the website repository. Regenerate there, then copy the project assets from apps/website/public/logos/ into this repository's docs/public/:

• unthrown-light.svg → logo-light.svg and logo.svg (the default).
• unthrown-dark.svg → logo-dark.svg.
• unthrown-mono.svg → logo-mono.svg (grayscale print, retaining the shading).
• unthrown-favicon.svg → favicon.svg.

The README and documentation navigation and hero use the light/dark pair. The favicon uses a simplified mascot portrait for legibility at small sizes. The social preview is og-unthrown.png, a 1200 × 630 PNG using the same mark. Its editable source is the website's branding/social-card.html, rendered with ?project=unthrown. Keep its dimensions in the VitePress metadata in sync when replacing it. Assets are committed locally; rendering never fetches branding from another site.