PoC using SwiftData looked great; then client says "I need databases shared". I think, this will take less than an hour... I hope some AI will understand "roll this back to Core Data and NSPersistentCloudKitContainer".

So I thought maybe the "IB agent" just never got started--cold restart, and bingo! Anyway, the problem forced me to do a lot of worthwhile cleanup.

Same problem; release version Xcode 13.2 (13C90)