PAR2 ('PAR2\0PKT') GF(2^16) Reed-Solomon Parity Verifier & Missing-Slice Archive Reconstructor

Deterministic Parchive 2.0 ('PAR2\0PKT') packet-header MD5 verifier + rolling CRC-32/MD5-16k sliding slice locator + Vandermonde/Cauchy matrix inversion over Galois Field GF(2^16) (primitive poly 0x1100B) engine (.par2, .rar, .7z, .zip) built for Parchive, Synology / TrueNAS Cold Backup, SABnzbd, 7-Zip — zero-upload ephemeral Wasm RAM execution.

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