Function audit_materials 

pub fn audit_materials(
    colors: &Colors,
    finishes: &RoleFinishes,
) -> Vec<ContrastFinding>

Every floor ink misses on a translucent surface under finishes, over the worst backdrop that surface can show (super::finish::worst_grounds): primary and secondary ink are body text there and tertiary ink large text, as on the opaque surfaces (AAA text on a high-contrast palette). Opaque roles add nothing: audit measures their grounds.