fix: statistics ignored the null bitmap - #6
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Stats read the raw payload of nullable columns, so the sentinel stored at null slots entered every result (a zero for unboxed columns, an error thunk for boxed ones): - mean/median/percentile/genericPercentile/stddev/skewness/variance/ IQR/sum now drop null slots via a shared dropNulls view. - correlation does listwise deletion over both columns. - valueCounts/valueProportions (and so frequencies) no longer count the sentinel as a category. - Maybe-typed views are untouched: their nulls are real values.
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Fork validation PR. 4 files, +16 HUnit cases (1113 total green), full test all exit 0.