Stops ALL fleet processes globally: the repo watcher, every org watcher, and all fleet-managed tmux sessions across every project. It also marks agents stopped in the database for the current project. It is the clean way to halt the entire fleet at once.
This is destructive and cannot be undone — agents must be restarted manually afterwards. It always kills tmux sessions; there is no graceful-versus-force distinction. The only flag is --json.