Seeker04/plwm

AI Summary: The task is to create a new Prolog predicate, `wait_for_file/3`, in the `utils.pl` file of the plwm project. This predicate will wait for a specified file to be created, checking periodically with a given interval and timing out after a certain duration. This will replace the current use of `sleep/1` in the unit tests, improving their reliability and speed.