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Zstandard Decompress: Decode .zst In-Browser

Decode a .zst frame locally: magic checked before the decoder runs, expansion capped, encode refused with a reason (decoder-only build).
Zstandard file

Decode only, on purpose: this build ships the zstandard decoder and no encoder: nothing half-ships. The magic bytes (28 B5 2F FD) are checked before the decoder runs, so wrong files fail with a name, not a crash.

Next door in Files

- Gzip compress/decompress (/files/gzip)
- Brotli Compress & Decompress (/files/brotli)
All files tools (/files)

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