Free unmaps memory on macOS#42
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Replaces the macOS
Std::Memory::Freeno-op with a real implementation: it reads the size header written byAllocand callsMunmap(base, size + HeaderSize), mirroring the Linux/BSD branches.Realloc(Alloc+Copy+Free) is fixed automatically.Depends on the
Munmapbinding (rux-lang/MacOS#4) and thunk (rux-lang/Rux#132). Verified end-to-end: a 1,000,000 x 1 MiB alloc/free loop completes (previously exhausted the address space) and a Realloc grow preserves data.