sutil holds only the utilities wanted on every machine; it is not a
command-line front end for the packages in pkg/. cbk and bip39wordlist
remain libraries with no CLI surface. The README states the boundary.
Bring back the in-progress viper and go-homedir configuration loading
from the original root command as a persistent pre-run on the root
command, with a --config flag and a config line in sutil info. Restore
the exported main.Version with a nolint directive instead of renaming
it. Export CGO_ENABLED=0 from the Makefile, drop -race from make test,
and remove the C toolchain from the Docker builder stage.
sneak