feat: bake global gitignore (core.excludesFile) into image

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.

CHANGELOG.md

@@ -13,6 +13,16 @@ Pre-v1.0.0 tags followed the pi npm version (`v{pi_version}[letter]`).
 
 ## Unreleased
 
+### Added
+
+- **Global gitignore baked into the image.** A `~/.gitignore_global`
+  (`*.bak`, `*.bak.*`, `*~`, `*.orig`, `*.swp`, `*.tmp`) is seeded into the home
+  dir from `/etc/skel-devbox/` on first boot (seed-if-absent, like
+  `.bash_aliases`/`.inputrc`, so user edits survive recreate) and wired via
+  `git config --global core.excludesFile`. Personal/tooling backup artifacts are
+  now ignored across all repos in the container without per-repo `.gitignore`
+  entries. The `core.excludesFile` wiring is skipped if the user already set one.
+
 ### Changed
 
 - **Secrets are now delivered to the container via `env_file: .env` only; the