40e3f609c2
Six bite-sized tasks: aura-engine record types + RunManifest.selection field (partial-build gate) -> downstream compile completion incl. the compat mirror (workspace gate) -> resample_block extraction + SplitMix64 pub -> inv_norm_cdf / expected_max_of_normals -> optimize_deflated + the metric_cmp value-read refactor -> CLI wiring + display. RED where behaviour is pinnable (C23 winner-unchanged tripwire, C1 seed reproducibility, the centred reality-check statistic, the inv_norm_cdf golden); back-compat goldens preserved. refs #144