Function caps 

pub fn caps() -> ComputeCaps

The probed ComputeCaps for this machine, computed once and cached for the process lifetime. The probe never panics: each backend is tried with ..::new(_).is_ok(), and any failure (no adapter, no driver, no device) is simply recorded as the corresponding flag being false.

coopmat/rt are taken from the wgpu probe context’s AdapterConstraints (the same flags the tuner uses to prune tensor-core / ray-query kernels), so they are honest hardware bits, not build-time assumptions.