Detect basket arbitrage in a Polymarket neg-risk (mutually-exclusive, multi-outcome) event - since a full YES basket across all outcomes always settles to exactly $1, a basket price away from $1 is a near risk-free edge. Also computes buy/sell_basket_capacity_shares, the actual liquidity-bottleneck size executable right now, so this is not just a top-of-book mirage. Polymarket only (Kalshi's Data ToS forbids this use of their data). Paid in USDC on Base.

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