docs: add git safety rules for quoting paths and non-interactive rebase

- Quote paths with brackets/parentheses to prevent shell expansion
- Use GIT_EDITOR=: GIT_SEQUENCE_EDITOR=: for non-interactive rebase

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Assisted-by: GLM-5 via Crush <crush@charm.land>

AGENTS.md

@@ -324,6 +324,8 @@ git push origin main
 - Run full test suite before committing
 - **Double-check `git status` before ANY commit** - verify staged files match intent
 - **Delete unused/obsolete files** when refactors or feature removals make them irrelevant
+- **Quote git paths with brackets/parentheses** (e.g., `git add "src/app/[candidate]/**"`) to prevent shell glob/subshell expansion
+- **Use non-interactive git rebase** - set `GIT_EDITOR=: GIT_SEQUENCE_EDITOR=:` or pass `--no-edit` to avoid opening editors
 - Update documentation when changing behavior
 - Follow existing code style
 - Use conventional commit messages