pub fn register_default_kernels(r: &mut FusedKernelRegistry)Expand description
Populate a FusedKernelRegistry with the always-built kernels
(today: fuel-cpu-backend FusedLinear F32/F64/BF16/F16). Called
from default_kernel_registry’s OnceLock initializer; exposed as
a free function so backend crates can compose against a custom
registry in tests.