Add multi-version Node.js testing to CI (#492)

* Add multi-version Node.js testing to CI

Configure GitHub Actions to test on multiple Node.js versions:
- Node.js 16.x (EOL but still in use)
- Node.js 18.x (LTS)
- Node.js 20.x (LTS)
- Node.js 22.x (Current)

Additional improvements:
- Add browser tests to CI pipeline
- Set fail-fast: false to test all versions
- Add descriptive step names

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

* Fix CI: Install Playwright browsers before running tests

* Remove browser tests from multi-version CI workflow

Focus on Node.js compatibility matrix testing only.
Browser tests can be added to CI in a separate workflow later.

* Remove Node.js 16.x from CI matrix

Node.js 16.x reached EOL in September 2023 and Vitest/Vite
no longer support it (crypto.getRandomValues compatibility issue).

Testing on actively supported LTS versions:
- Node.js 18.x (Active LTS)
- Node.js 20.x (Active LTS)
- Node.js 22.x (Current)

---------

Co-authored-by: Claude Code <[email protected]>
Co-authored-by: Claude <[email protected]>

Author: 3 people

.github/workflows/websocket-tests.yml

@@ -3,6 +3,11 @@ on: [pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+      fail-fast: false
+    name: Test on Node.js ${{ matrix.node-version }}
     steps:
       - uses: actions/checkout@v2
 
@@ -12,14 +17,17 @@ jobs:
 
       - uses: actions/setup-node@v3
         with:
-          node-version: 18.x
+          node-version: ${{ matrix.node-version }}
           cache: 'pnpm'
 
-      - run: pnpm install
+      - name: Install dependencies
+        run: pnpm install
 
-      - run: pnpm run lint
+      - name: Run lint
+        run: pnpm run lint
 
-      - run: pnpm run test
+      - name: Run unit tests
+        run: pnpm run test
 
       - name: Pull Autobahn Test Suite Docker image
         run: docker pull crossbario/autobahn-testsuite