pub const fn board_tier(copro: Coprocessor) -> BoardTierExpand description
Classify a coprocessor family into a BoardTier.
The base map modes (Coprocessor::None LoROM/HiROM/ExHiROM) are Core. As real
coprocessor boards land they move from BestEffort → Curated/Core once a
redistributable fixture or the accuracy battery backs them. The honesty gate reads THIS
classifier, so it can never be the case that a BestEffort board sits in the oracle set.