I received this message on Discord from one of the InterSystems team:

Demo cloud service doesn’t work for now, we disabled this feature. But you still can provide demo on your own server.

This text needs correcting, and not just because of the inconsistency about how many points an online demo is worth:

In your example does IE.cls represent your interop production class? One of the longstanding source control challenges of the InterSystems interop architecture has been the monolithic nature of the prodclass. Deltanji transformed the scene a few years ago by implementing source control at the level of the individual business hosts within the prodclass.

Unless your project and my project overlap on one or more business hosts, we can work alongside each other in a shared development namespace and each promote our work to test (and ultimately to prod) independently.

I might be on a road to nowhere though, given the problems I've been finding. I wonder if this'll qualify me for the "Find and report a bug" bonus 🤞