rusty_zstd 0.1.0

A ground-up, pure-Rust Zstandard (RFC 8878) compressor and decompressor. Levels -7..22 with all nine libzstd strategies, dictionaries + trainer, long-distance matching, seekable frames, multi-threading. Interoperable both directions with facebook/zstd v1.5.7, dual-gated per commit. Zero dependencies, no C, no *-sys, no FFI; builds on no_std + alloc and wasm32. MIT OR Apache-2.0.