//! CUDA GPU backend for Mamba SSM.
//!
//! - `inference` — GPU T=1 step with CUDA Graphs
//! - `forward` — GPU training forward pass
//! - `backward` — GPU training backward pass
//! - `device` — CUDA context + cuBLAS
//! - `buffers` — GPU memory management
//! - `kernels` — NVRTC kernel compilation
//! - `blas` — cuBLAS SGEMM wrappers
//! - `launch` — kernel launch helpers
pub use WeightDtype;