feat: add workspace isolation and administration UI

.github/workflows/ci.yml

@@ -16,15 +16,20 @@ permissions:
 
 jobs:
   ci:
-    name: Format, lint & build
-    runs-on: ubuntu-latest
+    name: ${{ matrix.os }} / Node ${{ matrix.node }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        node: [20]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: ${{ matrix.node }}
           cache: npm
 
       # `npm ci` does a clean, reproducible install from package-lock.json
@@ -38,5 +43,14 @@ jobs:
       - name: Lint
         run: npm run lint
 
+      - name: Test
+        run: npm test
+
       - name: Build
         run: npm run build
+
+      - name: Verify portable standalone dependencies
+        run: npm run verify:standalone
+
+      - name: Verify package contents
+        run: npm pack --dry-run --ignore-scripts