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.