- Switch all lb mirrors to mirror.mephi.ru/debian/ for faster/reliable downloads
- Disable security repo (--security false) — not needed for LiveCD
- Pin MEMTEST_VERSION=6.10-4 in VERSIONS, export to hook environment
- Set BEE_REQUIRE_MEMTEST=1 in build-in-container.sh — missing memtest is now fatal
- Fix 9100-memtest.hook.binary: add apt-get download fallback when lb
binary_memtest has already purged the package cache; handle both 5.x
(memtest86+x64.bin) and 6.x (memtest86+.bin) BIOS binary naming
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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