The old fig.retina=2 at 150 DPI rendered PNGs at 2x resolution that
GitHub markdown can't use, making text appear half its intended size.
Switching to 96 DPI without retina produces images at their natural
display size. Combined with the base font bump (14 → 16pt), titles
and labels now render with proper editorial presence.
Replace the 16-color / 3-palette system with the full Civilytics design
system: 53 named colors (full navy, ember, violet ramps plus teal, plum,
moss, brass supporting hues) and 10 visualization palettes (qual,
qual_warm, qual_cool, seq_ember, seq_navy, seq_violet, seq_paper_ink,
div_navy_ember, div_violet_ember).
Enrich theme_civilytics() with grid and paper_bg parameters, add
theme_civilytics_slide() for presentations, and load all four brand fonts
(Inter, Libre Franklin, Source Serif 4, JetBrains Mono).
Add README.Rmd with rendered gallery showing all palettes, theme
variants, grid options, dark/slide modes, facets, and scale usage.
jared
