chore: auto-merge lockfile refresh PRs

.github/workflows/refresh-lockfile.yml

@@ -79,3 +79,15 @@ jobs:
           else
             echo "PR #$existing already exists, branch updated via force push."
           fi
+
+      - name: Enable auto-merge for lockfile PR
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          pr_url="$(gh pr list --head chore/refresh-lockfile --json url --jq '.[0].url')"
+          if [ -z "$pr_url" ]; then
+            echo "Error: lockfile PR was not found." >&2
+            exit 1
+          fi
+
+          gh pr merge --auto --squash --delete-branch "$pr_url"