fix: correct variable usage in AI summary comment step

Author: pphatdev

.github/workflows/summary.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Comment with AI summary
         run: |
-          gh issue comment $ISSUE_NUMBER --body '${{ steps.inference.outputs.response }}'
+          gh issue comment "$ISSUE_NUMBER" --body "$RESPONSE"
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ISSUE_NUMBER: ${{ github.event.issue.number }}