zm.fetch

Update the origin/<branch> remote-tracking ref — git fetch.

Mirrors the world's ZeroMind branch head into local commit history without touching the working tree, and reports how the session branch relates to origin: behind counts origin commits you don't have, ahead counts local commits origin doesn't have, and diverged means both.

Content can advance on ZeroMind outside your session — a collaborator pushes, a pull request merges, an installed pin moves. Fetch is how that drift becomes visible: zm.status shows the remote-tracking line as of the last fetch, and zm.pull() reconciles (fast-forward when behind, three-way merge when diverged).