JJ Init

Two modes:

1. Auto mode — .git/ exists, .jj/ does not → colocate-init the repo, then run config audit.
2. Manual mode — user invokes /jj-init in a repo that already has .jj/ → skip init, go straight to config audit and dialog.

Auto mode: initialize

Prerequisite

command -v jj

If jj is not on PATH, stop. Do not proceed.

Detect and init