Reference screens

The design realization, rendered on Brand OS's own token values rather than on the values it was exported with. Generated at build from data-products/tokens/aleris-tokens.css, so a change to a token shows up here on the next build.

92 token names mapped onto canonical, 40 shared, 2 that canonical does not supply (--measure-text, --text-accent). These are a reference rendering, not a component library — an API surface is out of scope for Brand OS.