Background: https://www.jeffgeerling.com/blog/2023/smart-home-automation-shouldnt-be-stupid

Quick quote:
---8<---
Every smart device must be:

1. Local
2. Private
3. Additive
   ---8<---

#3 is tough to achieve, but #1 and #2 are quite doable.

The purpose of this milestone is to make sure HCC can

1. Operate with no Internet access without any loss of functionality, and
2. Operate without "cloud services" involvement over Internet with at least basic functionality.