Previous version had three inelegancies visible on GitHub:
- Full-width ghost rule read as an artifact dividing the banner in half
- Top terracotta bar looked like site header chrome
- Radial gradient created compression banding at CDN quality
v5 design:
- Terracotta rounded-rect logo mark (130px) with Paper 'A' inside —
the actual brand element per the style guide, not a floating letter
- Flat Shell / Paper background — compresses losslessly, zero banding
- No top bar, no ghost rule, no gradient gimmicks
- Same crisp Cormorant Garamond SemiBold + 2x supersample + Lanczos
- Both dark and light variants updated with identical layout
Replace app-icon-style horizontal lockup with centered stacked
composition: large standalone terracotta 'A' mark → thin parchment
rule → wide-tracked cream wordmark → amber italic tagline.
Edge-darkening vignette clears the center and frames the bokeh
atmosphere without muddying the text zone.
Render generated-image.png (blurred library bokeh, prompt 3) as the
dark-mode README banner with logo mark, wordmark, tagline, and
terracotta top rule composited on top via Pillow.
Switch README dark-mode <source> from banner-dark.svg to banner-dark.png.
Light-mode banner stays as the clean Paper SVG.
