bet-checker

Grade MLB, WNBA, PGA, and ATP bets against NegativeEV's thousands of play-by-play game simulations. Call get_slate first to confirm there's a checkable slate; check_bet spends one of the caller's checks only when the bet fully grades, and every check_bet result says so outright (`status`, `check_spent`), so read those rather than inferring from the numbers. A bet that came back `ungraded` was understood — it is simply not on the simulated slate, so re-sending it with different wording returns the same answer; check get_slate instead. get_usage shows what's left. Anonymous calls share a per-device quota of 100 checks a day; send a signed-in user's Supabase access token as `Authorization: Bearer` to raise that to 1000 an hour (see https://negativeev.com/auth.md). An invalid or expired token is rejected with 401 rather than silently downgraded, so re-authenticate rather than retrying anonymously.