improvement(executor): subflows, hitl handling cleanup

Merged
IC
5mo ago
+5130-837

Summary

Refactors parallel batching onto explicit DAG control flow while hardening nested subflow execution, pause/resume, run-from-block, and output resolution edge cases.

Type of Change

  • Other: Code quality

Testing

Tested manually

Checklist

  • Code follows project style guidelines
  • Self-reviewed my changes
  • Tests added/updated and passing
  • No new warnings introduced
  • I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)