Live sports-market mispricing detector. POST {milestone, market?}. Combines Kalshi's public play-by-play game_stats (Football/Basketball/Soccer/Hockey/Baseball/WNBA) with market candlesticks over the last hour to flag latency-arb windows when in-game momentum and market price diverge. Returns momentum_score, market_reaction_pct, and a directional latency-arb signal.