fix trivy workflow

Author: brendan-kellam

.github/workflows/trivy-vulnerability-triage.yml

@@ -105,5 +105,6 @@ jobs:
             Return your full report as markdown in the `report` field.
 
       - name: Write job summary
-        run: |
-          echo '${{ steps.claude.outputs.structured_output }}' | jq -r '.report' >> "$GITHUB_STEP_SUMMARY"
+        env:
+          STRUCTURED_OUTPUT: ${{ steps.claude.outputs.structured_output }}
+        run: echo "$STRUCTURED_OUTPUT" | jq -r '.report' >> "$GITHUB_STEP_SUMMARY"