Remove unused Node.js setup from CI workflow

The test workflow installed Node 22 but never used it.

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

.github/workflows/test.yaml

@@ -31,9 +31,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
-      with:
-        node-version: 22
 
     - name: Install uv
       uses: astral-sh/setup-uv@v7