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* Hardened AP Stack Management (see PR for details) * Fix low-memory boot issues caused by the larger AP stack area Zero only _bss.._stacks at first boot (the full sweep wiped ACPI/SMBIOS anchors above 0xE0000 on writable-shadow platforms), verify relocation addresses against pm_map, and relocate before smp_start() when the enabled CPUs' stacks would extend beyond usable low RAM, setting up the AP trampoline at start time.