Document the new "early exit" and "global dependencies" features
In order to get these features out and not hold up `main` any longer, I had to release them without documentation. We need to add docs for:

* [ ] inhibitOnNull
* [ ] What even is inhibit?
* [ ] assertNotNull
* [ ] trap
* [x] condition
* [ ] plan diagram rejectNull/trapError/trapInhibited representation

