chore(md): noting pre-commit command

Author: cmgoffena13

CONTRIBUTING.md

@@ -65,10 +65,12 @@ See [docs/development.md](docs/development.md) for full setup instructions. Key
 python -m venv .venv
 source .venv/bin/activate
 make install-dev
-make style    # Run before submitting
+make style     # Run before submitting
 make fast-test # Quick test suite
 ```
 
+Optionally, `make install-pre-commit` installs git hooks so ruff and mypy run on `git commit`. Hooks do not replace `make style`: they run on staged files, while CI runs `make style` across the tree.
+
 ## Coding Standards
 
 - Run `make style` before submitting a pull request