WinReg: fix memory over-read in GetHKeyName - #4
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Marshal.Copy(pKni, chars, 0, needed) copied `needed` chars (2x needed bytes) out of a buffer of needed+8 bytes. Replace with a byte-accurate copy bounded by ZwQueryKey's returned length, and decode the KEY_NAME_INFORMATION structure via its own NameLength field (DecodeKeyNameInformation, exposed for reuse and tests). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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`Marshal.Copy(pKni, bytes, 0, needed)` copied `needed` chars (2×`needed` bytes) from a buffer allocated for `needed` bytes, reading twice past the allocation.
Companion PR to mgth/LittleBigMouse#519, whose submodule pointer references this exact commit (3c825b0) — merge together, as was done for mgth/LittleBigMouse#476 + #2.
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