feat(coreutils): register newly ported commands
Wire up head, od, printf, pwd, readlink, rm, rmdir, seq, sleep, split,
stat, tac, tail, tee, time, touch, tr, tree, uniq, wc, and whoami in
the coreutils registry so they are available alongside the existing
ported commands.
Assisted-by: Claude Opus 4.7 via Claude Code
Signed-off-by: Xe Iaso <me@xeiaso.net>