Use a ValueTask read core and memory-based compressed-input refills on modern targets, replace per-block Huffman output arrays with scalar parameters, and decode directly into array-backed caller memory with a pooled fallback.
Preserve generated sync array-read semantics and clear codec output references after reads. Add slice, fallback, cancellation, failure, tree-validation, and read-ahead coverage; document staged ZIP profiles.
Validation: 2,989 .NET 10 tests passed; all library targets, net48 tests, and performance project compile; formatting checks pass.
