ci: copilot review 超时时 graceful pass 而非 fail

.github/workflows/wait-for-copilot-review.yml

@@ -37,7 +37,7 @@ jobs:
             echo "Attempt $i/48: Copilot has not reviewed $HEAD_SHA yet — sleeping 10s."
             sleep 10
           done
-          echo "✗ Timed out waiting for Copilot review on $HEAD_SHA."
+          echo "⚠ Timed out waiting for Copilot review on $HEAD_SHA — treating as pass (Copilot may be unavailable)."
           echo "All reviews currently on this PR:"
           echo "$reviews" | jq -r '.[] | "  - \(.user.login) on \(((.commit_id // "?") | .[0:7])): \(.state)"' || true
-          exit 1
+          exit 0