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Add probability distributions: PDF, CDF, Quantile - #21
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- NormalDistribution, BinomialDistribution, PoissonDistribution, UniformDistribution, ExponentialDistribution as self-quoting markers, matching CortexJS's calling convention - PDF needs no optional dependency for any distribution; discrete PDF uses a log-space reformulation (the direct formula overflows a float at n as low as 10,000) - Binomial/Poisson's CDF and Quantile reuse the existing GammaRegularized/BetaRegularized identities and require the special-functions extra; the other three distributions don't - Quantile search for discrete distributions via doubling-then- bisect, matching _is_figurate's existing pattern Verified against CortexJS's documented examples. 802 tests pass (784 existing + 18 new), 2 skipped.
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Adds NormalDistribution, BinomialDistribution, PoissonDistribution, UniformDistribution, ExponentialDistribution as self-quoting markers, plus PDF/CDF/Quantile to query them - matching CortexJS's own calling convention (e.g. ["CDF", ["NormalDistribution", 0, 1], 1.5]).
Verified against CortexJS's documented examples. 802 tests pass (784 existing + 18 new), 2 skipped.