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- uefi.rs: full EfiMemoryType constants (0-14) + memory_type_name(); fix
MEMORY_TYPE_LOADER_DATA from 6 to 2 per the UEFI spec
- memory.rs: replace the bump allocator with a first-fit free-list heap
(splitting, coalescing, 8-byte back-pointer for alignment-safe free);
add a bitmap physical page allocator (heap region reserved, page-0
guard, aligned runs); grow the heap from the page allocator on demand
- paging.rs: identity page-table helpers — adopt_tables() rebuilds the
firmware map into our own tables (OVMF maps its tables read-only, so
the firmware tree can't be modified in place) and switches CR3;
map_page/unmap_page/is_mapped with 2 MB/1 GB large-page splitting
- main.rs: boot self-tests for heap, pages, and paging
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