ci: enable jscpd duplicate detection and test timing artifact

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -116,6 +116,9 @@ jobs:
           PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
         run: bash scripts/require-tests.sh
 
+      - name: Detect copy-paste duplication
+        run: npx jscpd --diff origin/main --threshold 0.05 --ignore '**/*.test.ts' --ignore '**/*.test.mjs' --ignore 'node_modules/**' --ignore 'dist/**' --ignore 'web/**'
+
   build:
     timeout-minutes: 15
     needs: detect-changes
@@ -160,7 +163,14 @@ jobs:
         run: npm run validate-pack
 
       - name: Run unit tests
-        run: npm run test:unit
+        run: npx vitest run --config vitest.config.ts 2>&1 | tee .artifacts/test-timing.txt
+
+      - name: Upload test timing artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-timing
+          path: .artifacts/test-timing.txt
+          retention-days: 7
 
       - name: Run package tests
         run: npm run test:packages