After gathering use cases the discussion continued in this thread to talk about high-level design and implementation. After those high-level discussions I've had some conversations with people offline about more in-depth implementation details and prototyped a few future directions to explore areas where design decisions today could impact the ability to build on top of this. With the learnings from those discussions and prototypes we're shifting focus to implementing the initial feature set.
I'll let people know when it's in a state where they can try it out with their own projects.