fix(accessibility-scan): enhance threshold gate with artifact upload and download steps

Author: emmanuelknafo

.github/workflows/accessibility-scan.yml

@@ -179,8 +179,28 @@ jobs:
           sarif_file: a11y-results.sarif
           category: accessibility-scan/${{ matrix.scan-url.label }}
 
-      - name: Threshold gate
+      - name: Save results for threshold gate
         if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: a11y-sarif-${{ matrix.scan-url.label }}
+          path: a11y-results.sarif
+          if-no-files-found: ignore
+
+  a11y-gate:
+    name: Accessibility — Threshold Gate
+    runs-on: ubuntu-latest
+    needs: a11y-scan
+    if: always()
+    steps:
+      - name: Download SARIF results
+        uses: actions/download-artifact@v4
+        continue-on-error: true
+        with:
+          pattern: a11y-sarif-*
+          merge-multiple: true
+
+      - name: Evaluate thresholds
         run: |
           if [ -f a11y-results.sarif ]; then
             CRITICAL_COUNT=$(jq '[.runs[].results[] | select(.level == "error")] | length' a11y-results.sarif 2>/dev/null || echo "0")
@@ -198,4 +218,6 @@ jobs:
               echo "::error::Accessibility score $SCORE is below minimum threshold ${{ env.A11Y_FAIL_THRESHOLD }}"
               exit 1
             fi
+          else
+            echo "No SARIF results found — skipping threshold check"
           fi