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free now locates the chunk matching the pointer, marks it as
free for TINY/SMALL zones, and munmaps LARGE allocations.
Document why ASan is incompatible and list alternatives.
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malloc now searches zones for a free chunk, splits it to the
requested aligned size, and allocates a new zone when none have
space. Replace getpagesize() with sysconf(_SC_PAGESIZE).
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Implement show_alloc_mem() to print all zones and allocations
by ascending address. Add test_show binary that links directly
against libft_malloc.so to exercise it.
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Implement mmap-based zone allocation for TINY (<=128B) and SMALL
(<=1024B) categories. malloc now creates zones on demand and
returns a pointer to the first chunk.
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Build system produces libft_malloc_$HOSTTYPE.so shared library with
Libft (NOMALLOC=1) as dependency. Stub functions print their name
and return NULL. Test runner compares system malloc vs LD_PRELOAD
output using write(2) to avoid stdio interference.
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