TMDB's origin_country returns ISO codes (KR), not full names, causing
a vault regression from South Korea to KR. buildRecord now prefers
production_countries[0].name, falling back to the raw origin_country
code only when absent.
TMDB also now returns vote_average at full precision (6.537), causing
mass diff noise against the vault's 1-decimal convention and spurious
rewrites on precision drift alone. tmdb_rating is now rounded to 1
decimal place.
Loki fixture updated to realistic TMDB shapes (ISO country code +
production_countries) to catch this regression going forward.
