674a50ea05
Adds jobrunner (short alias jr) for running, listing, inspecting, re-attaching to, and terminating detached background tasks. Unlike bkg and detach, which discard output, a jobrunner job keeps a live terminal that survives closing the shell and can be restored later with attach. Includes the __jobrunner_sessions parser shared by the function and its completions, dynamic job-name completions, and screen in the fish-deps catalog.