On re-runs, ~/.config/nvim is moved aside to ~/.config/nvim-1
(or nvim-2, nvim-3, ... — first free number) and a fresh clone is
created. End-of-run notices report the backup path so it's visible
after the rest of the bootstrap output scrolls by.
Previously rmtree'd ~/.config/nvim on every full bootstrap run, destroying
any user edits, plugin state, and undo history. Now skips when the
directory is already a clone of the expected repo, and refuses to touch
unfamiliar contents (different remote, or non-git directory).
Claude