mkz-0.1.2

mkz is a tar-style archiver whose backend is a reversible, schema-free auto-columnar transform followed by zstd. It is not a new compressor: it is a structural pre-pass that makes zstd measurably smaller on structured, line-oriented data (logs, CSV, JSONL, telemetry) and is provably never worse anywhere else: each block keeps whichever of raw-zstd or transformed-zstd is smaller. Both creating and extracting stream in constant memory (roughly one block, independent of archive or member size), and every archive carries a SHA-256 of the reconstructed original, verified on extract, so corruption is always detected and reported (streaming extraction is not yet atomic, so already- written files may remain on failure). This is the pure-C build: it depends only on libzstd (SHA-256 and base-95 are vendored) and is byte-compatible with the reference implementation.