brandedLightColorScheme

Builds the light color scheme for a brand, derived from a single brand color and an accent color.

The brand color is classified by lightness (soft / medium / strong) and the two missing tones are rebuilt at their canonical lightness, keeping the brand's hue and saturation. The on* content colors are black or white: fixed per tone, by classification for CgsColors.Brand.onBrand, and by WCAG contrast ratio for CgsColors.Brand.onAccent. Neutral and status tokens stay identical to lightColorScheme.