svm/pools/ohlc: open or close can fall outside [low, high]

[0237h]

/v1/svm/pools/ohlc exposes the p5 / p95 quantiles of price as low and high, while open and close come from argMin / argMax over time. When a candle's open or close trade falls in the lowest 5% or highest 5% of fills, that price sits outside the [low, high] band — a violation of standard OHLC semantics.

src/routes/ohlcv/svm.sql:14-15:

quantileDeterministicMerge(0.95)(quantile0) AS high_raw,
quantileDeterministicMerge(0.05)(quantile0) AS low_raw,

Suggested fix

Clamp high_raw to greatest(high_quantile, open, close) and low_raw to least(low_quantile, open, close) so that low ≤ {open, close} ≤ high holds for every row.

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