Engine-Equal, Human-Unequal: A Reproducible Outcome Skew in Engine-Assessed Equal Chess Positions — analysis code and data archive

Analysis code, deep-verified position set, per-position skew tables, robustness-check results, and run manifest supporting the paper 'Engine-Equal, Human-Unequal: A Reproducible Outcome Skew in Engine-Assessed Equal Chess Positions'. The archived derived data are position-level and contain no account identifiers, direct or coded.