Add tests for multi-daemon setup

[msm-code]

Feature Category

• [x] Correctness
• [ ] User Interface / User Experience
• [ ] Performance
• [ ] Other (please explain)

Describe the problem

There are (or used to be) correctness issues with multi agent deployments. We should at least try to test multi-agent deployments automatically.

Describe the solution you'd like

Extend automated tests.

Describe alternatives you've considered

It's not very high priority, but I definitely would like to see it. Maybe I could also use multiple agents in my instance I plan to host (just to test it works continuously)