fix: retain disabled workflow tombstone

Co-Authored-By: Codex <noreply@openai.com>

Author: Pigbibi

.github/workflows/dependabot_review_request_cleanup.yml

@@ -0,0 +1,51 @@
+name: Dismiss Dependabot Review Request
+
+# Disabled tombstone: automatic cleanup cannot retract an already-sent review notification.
+"on":
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  dismiss-review-request:
+    if: >-
+      (github.event.pull_request.user.login == 'dependabot[bot]' ||
+       github.event.pull_request.user.login == 'app/dependabot') &&
+      github.event.requested_reviewer.login == 'Pigbibi'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Dismiss Pigbibi review request
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REVIEWER: Pigbibi
+        run: |
+          set -euo pipefail
+          current_review_requests() {
+            gh pr view "${PR_NUMBER}" \
+              --repo "${GITHUB_REPOSITORY}" \
+              --json reviewRequests \
+              --jq '.reviewRequests[].login'
+          }
+
+          review_requests="$(current_review_requests)"
+          if ! grep -Fqx "${REVIEWER}" <<<"${review_requests}"; then
+            echo "No review request for ${REVIEWER}; nothing to dismiss." >> "${GITHUB_STEP_SUMMARY}"
+            exit 0
+          fi
+
+          if ! gh api --method DELETE \
+            "repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/requested_reviewers" \
+            -f "reviewers[]=${REVIEWER}"; then
+            review_requests="$(current_review_requests)"
+            if ! grep -Fqx "${REVIEWER}" <<<"${review_requests}"; then
+              echo "Review request was removed concurrently; nothing to dismiss." >> "${GITHUB_STEP_SUMMARY}"
+              exit 0
+            fi
+            exit 1
+          fi
+
+          echo "Dismissed Dependabot review request for ${REVIEWER}." >> "${GITHUB_STEP_SUMMARY}"