It's not a commit per change - all changes made since the last commit are in a new commit. You then usually do one of two things:
- Decide your changes are perfect, so add a commit message to this one and then create a new one on to to carry on
- Decide you only want some of them so use `jj split -i` to select which ones you want and then it creates two commits - the stuff you want in a new named commit, and the stuff you didn't in a new working copy commit. This is the JJ workflow equivalent to `git add -p` adding to the staging area then committing
