Alpine uses mdev which has no rules for NVIDIA devices. Without /dev/nvidiactl
and /dev/nvidia{0-7}, nvidia-smi returns NVML_ERROR_LIBRARY_NOT_FOUND (exit 12)
even though kernel modules are loaded and libraries are present.
Fix: after insmod, read major numbers from /proc/devices and mknod the required
character devices (/dev/nvidiactl, /dev/nvidia{0-7}, /dev/nvidia-uvm).
Add /dev/nvidia* node checks to smoketest for earlier failure detection.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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