A Python 3 driver with defconfig, fetch, tree, build, bootimg, status
and clean. Device repositories supply board.toml and configs/*_defconfig;
external sources come from feeds.toml and are fetched with shallow,
blobless, sparse git checkouts pinned in unixnu.lock. Modules can come
from local directories through --local, --local-<kind> and
--local-module. The boot image step packs BootShim, the firmware volume
and the device tree for a Mu-Silicium checkout given with --uefi.
The checks guarded a local development disk floor and do not belong in
the shared scripts. The scratch image capacity check in
prepare-air-nir-diagnostic.py is kept because it validates a mounted
image, not the host disk.
bluseliu50