The cheap section listing that drives the main sync only stores the top ~3 cast,
so any cast member below that was unfilterable (clicking them AND-emptied the
grid). Now the movie/show info fetch (/item, /show) — which already pulls the full
rich cast — persists it onto cast_names + people_text (so every displayed cast
member becomes filterable) and caches each headshot in the new plex_people table
(migration 0056). Idempotent (only grows a thinner stored set); best-effort (never
500s a read). Verified: 10 Cloverfield Lane 3->8 cast after viewing; plex_people
populated with photos. (Plex cast-explore S1a)