Add native Crystal exploration port and reference tooling

.github/workflows/checks.yml

@@ -0,0 +1,21 @@
+name: Checks
+on: [push, pull_request]
+permissions:
+  contents: read
+jobs:
+  web:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - run: npm run check:vendor
+      - run: npm test
+      - run: npm run build
+      - run: npm run check:release
+      - run: npm run build:reference
+      - run: npx playwright install --with-deps chromium webkit
+      - run: npm run test:e2e