- parseRankingCriteria: parse natural-language criteria, returns ParsedRankingRule[]
- executeRanking: fetch+rank both categories, persist CONFIRMED RankingSnapshot
- quickRank: parse+execute in one step, persist QUICK RankingSnapshot
- listSnapshots: list snapshots for a round ordered by createdAt desc
- getSnapshot: fetch full snapshot by ID with NOT_FOUND guard
- All procedures use adminProcedure (SUPER_ADMIN, PROGRAM_ADMIN only)
- Casts to Prisma.InputJsonValue via unknown to satisfy strict TS
