Initial commit

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

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+# os-init
+
+Post-install initialization scripts, one directory per operating system.
+
+| Directory | Target | Script |
+|-----------|--------|--------|
+| `debian/` | Debian 13 (GNOME desktop) | `debian13-init.sh` |
+| `macos/`  | macOS | `macos-init.sh` |
+
+## Conventions
+
+- Each OS directory is self-contained: a single script, run directly on the
+  target machine, plus its own `AGENTS.md` for OS-specific rules.
+- Scripts must be idempotent (safe to run repeatedly) and must not change
+  security-sensitive settings without an explicit opt-in.
+- Add a new OS by creating `<os>/` with `<os><version>-init.sh` and adding a
+  row to the table above.