fix(ci): install YAML dependency for QMD unit tests

.gitea/workflows/ci.yml

@@ -177,12 +177,16 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     needs: [python]
+    env:
+      QMD_PACKAGE_DIR: ${{ runner.temp }}/qmd-tests
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v22.16.0
         with:
           node-version: '24'
       # CI runs model-free tests only; real-model integration requires a suitable local machine.
+      - name: Install QMD test dependency
+        run: npm install --prefix "$QMD_PACKAGE_DIR" --ignore-scripts --no-package-lock --no-audit --no-fund yaml@2.9.0
       - name: Run QMD unit tests
         run: node --test scripts/tests/test-qmd-lib.mjs scripts/tests/test-qmd-daemon.mjs scripts/tests/test-qmd-search.mjs scripts/tests/test-qmd-warm.mjs scripts/tests/test-qmd-benchmark.mjs