Reuse unpacker-owned pooled scratch arrays for async RAR5 and RAR2 Huffman tables, preserving alphabet bounds and zeroed history tails. Match async Archive CRC32/BLAKE2sp verification to the synchronous path and dispose entry streams when initialization fails.
Add regression tests and profiling documentation showing approximately 3.13 MiB fewer managed allocations per 200 MiB extraction. Keep this change based directly on master without unrelated branch commits.
Validation: 2,983 .NET 10 Release tests passed, all six library targets built, net48 tests compiled, and formatting checks passed.
