v0.15.4 - anonymous usage analytics

The app now records ANONYMOUS, content-free usage so we can see how CITED Score is actually used and improve it. Default-on, disclosed, one-click opt-out (checkbox on the main screen).

Recorded (buckets / categories / booleans only): page-count band, site type, score band, whether a run was a re-run, feature use, launch + version.
Never sent: your URLs, domains, the sites you audit, page content, or anything identifying you. Re-runs are detected on your own machine - only a true/false leaves.

No scoring changes. Existing installs will show an update banner.