Sync with v1.4.0 docs: MIT pipeline rewrite, current readmes, test counts
Rename ZARSharp -> ZArchiveSharp, refresh stale claims Wiki still named the old project and carried superseded claims (3800 tests, no dictionaries, 0.28x native). Rename everywhere, fix counts, document dictionary use and measured native parity.
Import multi-page documentation from docs/ Home, Getting Started, CLI/API reference, format specs (ZAR, zstd, seekable), pipeline, benchmarks, FAQ and sidebar.