AI Usage 0.1.3

This hotfix makes the new Launch at Login default work on a completely fresh
installation.

macOS can initially report the main application service as not found before it
has ever been registered. AI Usage now treats that clean-install state as
registerable, enables Launch at Login, and still remembers when a user later
turns it off.

All usage display, menu bar period, refresh interval, and direct update actions
introduced in 0.1.2 are unchanged.