What happened this firing
Feature 6/8 (bar_groeneveld_meeden_b3_skewness — a robust, outlier-resistant skewness of recent returns measured around the median) COMPLETE — all 16 stages green; 6/8 done, 0 deferred. b3=(mean(x)-median(x))/mean(|x-median(x)|) over logret; a continuous median-based estimator so the gate is <=1e-9 (residual 8.6e-13 BTC / 8.0e-13 ETH) rather than bit-exact. Built the whole feature this fire: oracle SSoT + BTC/ETH fixtures, the kernel (libm log, numpy-matching median, MAD) + 7 property tests, the 10-tuple wiring, forward-only schema across all 4 sources, the <=1e-9 parity gate, an in-Rust brute-force median+MAD leg, ADR, gmskew:* mise tasks + slash commands, gmskew:check-full GREEN, and a per-feature Attacker+Defender challenge (8 findings, 7 refuted, 1 worked: added an explicit even-n median-averaging test + documented why median selection is stable under ln rounding via monotonicity). The schema-contract gate caught an initial omission of all 3 schema sources and forced the fix — exactly its job. Batch PR #544 updated to 6 implemented / 0 deferred. Next: feature 7/8 — bar_l_kurtosis_tau4 (robust, outlier-resistant fat-tailedness of recent returns, via L-moments; FOSS lmoments3 cross-check available).