Install gh-aw in pre-commit CI workflow

So the compile-workflows hook runs in CI too, replacing the
dedicated compile-check workflow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: theletterf

.github/workflows/pre-commit.yml

@@ -17,4 +17,8 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: "3.x"
+      - name: Install gh-aw
+        run: gh extension install github/gh-aw
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - uses: pre-commit/action@v3.0.1