README: what --clone does for a private repository (the template's
gh/store helpers, the gh auth login offer, keep those lines in your
config, what gets cloned into and that re-running continues), the
git/gh lines in the usage example, and that uninstall no longer waits
for programs from the Nix store. docs/cleanup.md: the clone steps, the
untouched-template marker, and the LazyUnmount= drop-in.