ai: apply changes for #879 (1 review thread)

Addresses:
  - #3641995560 at .github/workflows/trigger-integration-tests.yml:476

Signed-off-by: peco-engineer-bot[bot] <peco-engineer-bot[bot]@users.noreply.github.com>

Author: peco-engineer-bot[bot]

.github/workflows/trigger-integration-tests.yml

@@ -475,7 +475,8 @@ jobs:
       github.event_name == 'pull_request' &&
       github.event.action == 'closed' &&
       github.event.pull_request.merged == true &&
-      github.event.pull_request.base.ref == 'main'
+      github.event.pull_request.base.ref == 'main' &&
+      github.event.pull_request.head.repo.fork == false
     # Serialize by PR so a manual re-run (e.g. recovery after the failure
     # comment fires, or an accidental Actions "Re-run") cannot overlap with an
     # in-flight run and double-dispatch coverage-fanout. cancel-in-progress is