fix(ci): add no-op stale cd cancellation job

.gitea/workflows/cd.yaml

@@ -45,6 +45,18 @@ env:
   ALERT_CHAIN_API_URL: https://awoooi.wooo.work
 
 jobs:
+  cancel-stale-cd:
+    # 2026-06-28 Codex: keep a visible no-op run for controlled queue
+    # cancellation. If every job is skipped, Gitea may not create a run and
+    # the stale pre-guard CD queue is not superseded by concurrency.
+    if: ${{ github.event_name == 'push' && contains(github.event.head_commit.message, 'cancel-stale-cd') }}
+    runs-on: awoooi-host
+    timeout-minutes: 3
+    steps:
+      - name: Confirm Stale CD Queue Cancellation
+        run: |
+          echo "cancel-stale-cd marker accepted; deploy jobs are intentionally skipped."
+
   tests:
     # 2026-06-28 Codex: Gitea does not consistently short-circuit `[skip ci]`
     # on CD-generated deploy commits. Skip jobs explicitly so marker commits