Memory allocation notes for the embedded LZMA SDK (26.02)

Alloc.c provides MyAlloc/MyFree and optional large-page helpers (when
Z7_LARGE_PAGES is defined, which Precomp.h enables by default on
supported platforms). lrzip uses the default g_Alloc path via LzmaLib.

To experiment with allocation strategy, see Alloc.c / Alloc.h in C/.
