Before calling upsert_actor(), check if the actor already exists using
registry.get_actor() or service.get_actor(). If the actor exists and
update_existing is False, print the spec-required error panel and exit
with error code 1.
Error panel includes:
- Actor name
- Registration timestamp (formatted as YYYY-MM-DD HH:MM)
- Hint to use --update flag
Adds Behave tests for:
- Duplicate-without-update failure case (exit code 1, error panel shown)
- Duplicate-with-update success case (exit code 0, actor updated)
- New actor without --update success case (exit code 0, actor added)
ISSUES CLOSED: #2609
freemo