Add hardened .npmrc for supply-chain audit (PTAAA-436)

.github/workflows/static.yml

@@ -34,7 +34,8 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          # Read the version from .nvmrc so CI matches engines.node (engine-strict=true in .npmrc)
+          node-version-file: '.nvmrc'
 
       - name: Install dependencies
         run: |

.npmrc

@@ -0,0 +1,10 @@
+# Supply-chain security hardening
+# Required by the BrowserStack supply-chain .npmrc audit (Enigma / SC-12282).
+# See: https://browserstack.atlassian.net/wiki/spaces/ENG/pages/6091571922/Supply+Chain+Security+Enhancements+Tech+Spec
+
+ignore-scripts=true      # blocks malicious package lifecycle scripts
+strict-ssl=true          # enforces TLS for registry connections
+save-exact=true          # pins exact dependency versions
+audit-level=high         # fail on high+ severity advisories
+engine-strict=true       # refuse incompatible Node engines
+legacy-peer-deps=false   # preserve npm 7+ peer-dependency resolution