spacetime-verifier: an independent curvature evaluator for machine-learned spacetimes

An independent evaluator for machine-learned solutions of the Einstein field equations: finite-difference Ricci, Kretschmann, Petrov speciality index and trapped-surface diagnostics from a metric callable, sharing no code with the systems it evaluates, with a measured and published error floor. Includes a complete reproducibility audit of the black-hole configuration of the AInstein project (arXiv:2607.05489) as a worked case study, with frozen thresholds, hidden evaluation points and per-artifact attestations.