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asan: fix internal allocator hardening

Fix several hardening allocator issues:
* guard ASAN redzone/alignment size arithmetic against overflow;
* avoid treating tail munmap addresses as full ASAN mmap allocations;
* route freed blocks through a bounded quarantine instead of leaking all
  allocations forever;
* free old realloc blocks through the same quarantine path.

Add allocator hardening tests for oversized allocation handling and
quarantine release behaviour.

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