Projection: A JJ Workflow for splitting public and private files

Hi HN,

I wrote up a Jujutsu workflow that I came up with recently. I wanted to work on a public open-source repository while also versioning the private context files that influenced each public commit: specs, product notes, experiments, and agent instructions.

I use coding agents heavily, which means the specs are often as important as the final code. I wanted a proper way to manage them without making them reachable from public history.

Jujutsu’s features give us a compact solution based on filesets, revsets, and `git.private commits`. With a small amount of code, this achieves a public/private split without much heavier tools like Copybara.

This is advanced material. It assumes intermediate jj knowledge, especially around revsets. Let me know what you think.

That looks interesting, thanks. I'll try it out.