You can eye-add a show to the watchlist before we know its status, so ended/canceled
shows leak in (auto-airing LIBRARY shows already exclude ended ones; explicit follows
don't). Fix it as cleanup-on-process, per Boulder: the daily 'Wishlist Today's Airings'
automation now runs a watchlist-tidy pass first — scans every explicit show follow,
resolves its status (local for owned, TMDB for tmdb-only follows), and removes any
that have ended/been canceled/completed. Only prunes on a DEFINITIVE terminal status;
unknown/lookup-error → left alone. Toggle prune_ended (default on); returns shows_pruned.
DB: followed_shows(). Pure prune_ended_show_follows() with injected seams; seam tests.
