Can you write out another Markdown document called Implementation Guide? This is more of a guide for a junior developer to reimplement the PR from scratch. I want you to give an abbreviated version of the background and then walk through various milestones, ideally with some verifiable behavior at each step.
Each milestone has to be verifiable in some way, whether it's tests or visible behavior. Write it as a tutorial, specifying what changes to make and how to test them.
Walk through all the milestones, and feel free to extend your plan beyond where this PR got to. The goal is like a guide for a junior dev that will get them to a working version at the end.
go in depth! ultrathink
src: https://xcancel.com/geoffreylitt/status/1991909304085987366