rsync remote files locally

During the process running, or after the process finishes, it'd be neat if files were rsynced back down to the local machine.

We could use inotify or similar to make this as seamless as possible: https://superuser.com/questions/317820/linux-continuously-synchronize-files-one-way

The issue names no files, tests, or entry points. Start by locating the command-running and remote-sync paths in the repository, then define whether synchronization happens during execution, after completion, or both; done means remote files are reliably available locally as described.

Written by the indexing model from the issue text.