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docs(uml): regenerate architecture diagrams for the 27-distribution v2.4.0 surface

Status: Open.

#148 In OldCrow/libstats;

· OldCrow opened on Sep 5, 2026

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Accuracy, contracts & kernel hygiene patch

tooling(dispatch): threshold_validator implements the distrusted first-crossing heuristic; sustained-crossover extraction lives in per-bundle script copies

Status: Open.

#146 In OldCrow/libstats;

· OldCrow opened on Sep 4, 2026

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Accuracy, contracts & kernel hygiene patch

perf(von-mises): CDF dispatch thresholds were provisional since #51 — both Mac tiers measure parallel NEVER wins (memory-bound #111 batch CDF); Zen 4 row needs a sustained re-measure

performance

Status: Open.

#144 In OldCrow/libstats;

· OldCrow opened on Sep 4, 2026

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Accuracy, contracts & kernel hygiene patch

detail::gamma_p: ~1.7e-7 relative error at large shape (alpha ~ 1e4) bounds Gamma/Erlang/InverseGamma CDF accuracy

enhancementNew feature or requestNew feature or request

Status: Open.

#141 In OldCrow/libstats;

· OldCrow opened on Sep 4, 2026

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Accuracy, contracts & kernel hygiene patch

detail::digamma is ~1.3e-8 absolute — binds entropy accuracy; libhmm's 2e-14 implementation is the in-fleet reference

enhancementNew feature or requestNew feature or request

Status: Open.

#138 In OldCrow/libstats;

· OldCrow opened on Sep 3, 2026

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Accuracy, contracts & kernel hygiene patch

detail::inverse_beta_i: absolute 1e-8 stopping rule + [1e-8, 1−1e-8] clamp make Beta quantiles unusable beyond p ~ 1e-8

bugSomething isn't workingSomething isn't working

Status: Open.

#137 In OldCrow/libstats;

· OldCrow opened on Sep 3, 2026

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Accuracy, contracts & kernel hygiene patch

detail::erf_inv extreme-tail band is wrong and non-monotone; Gaussian getQuantile inherits it for p ≳ 1−1e-9

bugSomething isn't workingSomething isn't working

Status: Open.

#136 In OldCrow/libstats;

· OldCrow opened on Sep 3, 2026

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Accuracy, contracts & kernel hygiene patch

quality(tests): UniformEnhancedTest speedup gate fails 2-in-3 on the Zen 4 reference machine -- widen the cheap-PDF margin or drop the assertion

quality

Status: Open.

#129 In OldCrow/libstats;

· OldCrow opened on Aug 26, 2026

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Accuracy, contracts & kernel hygiene patch

quality(simd): SIMDPolicy::detectBestLevel duplicates the tier ladder in SIMDState::initialize -- dead code, third copy of the #117 gates

quality

Status: Open.

#128 In OldCrow/libstats;

· OldCrow opened on Aug 26, 2026

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v3.0.0 — Architecture Refactor

quality(parallel): parallelReduce and parallelStatOperation harvest futures inside the combine loop -- the early-rethrow use-after-free shape #118 fixed in parallelFor

platform

quality

Status: Open.

#127 In OldCrow/libstats;

· OldCrow opened on Aug 26, 2026

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Accuracy, contracts & kernel hygiene patch

accuracy(special-functions): beta_i loses ~1e-6 absolute at b >= 1e9 -- lgamma cancellation in the log-beta prefix

accuracy

Status: Open.

#126 In OldCrow/libstats;

· OldCrow opened on Aug 26, 2026

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Accuracy, contracts & kernel hygiene patch

bug(discrete): NegBin/Geometric public cdf/logpdf narrow the count to int -- UB past INT_MAX, ISA-dependent; quantile can return a count its own CDF maps to 0

accuracy

bugSomething isn't workingSomething isn't working

Status: Open.

#125 In OldCrow/libstats;

· OldCrow opened on Aug 26, 2026

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Accuracy, contracts & kernel hygiene patch