Zrip: Safe Rust zstd codec (levels -7..4)

zrip (repo) is a pure Rust zstd codec. Fast and DFast strategies, levels -7 through 4. Optimized for encode throughput in transfer pipelines that need standard zstd frames at high speed. Includes COVER/FastCOVER dictionary training, streaming encode/decode, and no_std support.

All compression and decompression logic is #![forbid(unsafe_code)]. unsafe is confined to SIMD kernels and unchecked accessor wrappers with debug_assert! guards.

Perf: x86_64

summary_x86_64

Let it rip! Contributions welcome.

v0.1.2 released. New scatter chart showing encode speed vs compression ratio across all
levels:

encode speed vs compression ratio