Keep clean installation compatible with npm 10

.github/workflows/unit-ci.yml

@@ -121,6 +121,9 @@ jobs:
           node-version: '24.x'
           cache: 'npm'
 
+      - name: Verify clean installation with npm 10
+        run: npx --yes npm@10.9.4 ci --ignore-scripts --no-audit --no-fund
+
       - name: Install dependencies
         run: npm ci