Function project_for_preset 

pub fn project_for_preset(scene: &Expr, preset_name: &str) -> Option<Expr>

Projects scene toward the named surface preset’s capabilities.

Looks up the preset in crate::surface::preset and reduces the Scene to its display density via crate::codec::reduce_for_caps. Returns None for an unknown preset. Deterministic for a given (scene, preset_name).