ci: install example deps in skills-cli-compat job before validate

Author: tph-kds

.github/workflows/skills-cli-compat.yml

@@ -14,11 +14,16 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: examples/02-example/package-lock.json
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
       - name: Install validation dependencies
         run: python -m pip install -r requirements-dev.txt
+      - name: Install example dependencies
+        working-directory: examples/02-example
+        run: npm ci
       - name: Validate repository artifacts
         run: npm run validate
       - name: Validate discovery by Agent Skills CLI