Seed ~/.gitignore_global from /etc/skel-devbox (seed-if-absent, like
.bash_aliases/.inputrc, so user edits survive recreate) and wire it via
git config --global core.excludesFile, guarded so a user-set excludesFile
is never overridden. Ignores *.bak, *.bak.*, *~, *.orig, *.swp, *.tmp
across all repos without per-repo .gitignore entries.
pi