seurust - 'Rust' Native Kernels for 'Seurat'

Provides 'Rust' implementations of performance-critical 'Seurat' native routines such as log-normalization, sparse row scaling, shared nearest-neighbor graph construction, and integration helpers. Install alongside 'Seurat' to use the same function signatures with a 'Rust' backend. Builds require 'Cargo' and 'rustc' (>= 1.81); CRAN source builds include offline crate sources under 'src/rust'.