Constant PEER_PALETTE 

pub const PEER_PALETTE: [(u8, u8, u8); 12];

Every colour a peer can be drawn in: the design language’s twelve presence hues (tokens::colors::PRESENCE_HUES, 30° apart) at the dark material’s presence lightness and chroma (OKLCH L 0.74, C 0.14, gamut mapped), as sRGB. Equal lightness and chroma, so no participant looks more important than another; a closed ring rather than a hash over all 360 hues, so two people never land a few degrees apart.