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Covers what the boot-ISO ARM test never did: DHCP option 93 handing an arm64 client an arm64 iPXE binary, dispatch serving an aarch64 kernel, and `provision debug` reaching a rescue shell over SSH. Split by cost. `arm-pxe` runs NBP handoff, discovery and rescue in about 20-30 minutes -- that is the path the DGX Sparks need. The full install is another hour on top and only runs with ARM_PXE_FULL=1; an hour-plus test that runs by default is a test nobody runs. The suite fails fast if the arm64 iPXE build lacks LoadFile2, because the symptom otherwise is a 30-minute boot ending in unknown-block(0,0) -- byte-identical to the DGX Spark bug this all started with, and easy to misdiagnose as a reproduction of it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015nRFZXpKwUVE4SRSHw6GjF