improvement(executor): subflows, hitl handling cleanup #4604

Bugbot Review

Bugbot Analysis Progress (1m 22s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (1m 15s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_afc85ed3-6fc5-4dfa-9e12-d0d101a5c7d1

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 1e5a746. Configure here.}