Source Code Management

jj workflow for preserving all work. Nothing is ever lost.

Core Principle

Every change is automatically tracked. In jj, working copy (@) is always a commit. No staging area. Every save is part of the current commit.

Commit after every testable change - After each TDD cycle, run jj commit -m "msg". Don't batch. Worktree gets squash-merged anyway.
Finalize before destructive ops - Before jj restore, jj abandon, or ending session: commit first.
Experiments: commit, try, backout - Commit the experiment, evaluate, then jj backout -r @- if discarding. History preserved.
Unknown changes: preserve first - Never jj restore unknown changes. Commit checkpoint, then investigate with jj diff -r @-.
Deleting code: commit, then delete - Checkpoint before removing so you can recover from history.