CSOAI EAT Benchmark Artefacts — 58-Subject T4 Clan Full Spread + Cross-Substrate Checks (2026-08-02)

Signed benchmark artefacts from the CSOAI/MEOK EAT fleet, all free-tier substrate: (1) 58-subject clan full spread on Kaggle T4 (4,408 cells, 100% measured, anti-Goodhart PRACTICE/HELD_OUT split, flywheel salt csoai-flywheel-v1); (2) weights-joined T4-vs-M4 cross-substrate checks (57 valid weight-verified rows; model NAME is not a model — joins on weight blobs only); (3) micro1 N-site sweep (1GB free CPU substrate); (4) EAT coverage manifest (24/24 lanes). League leader: sov33-unified (T4 practice 0.778). Register: living attestation, never certification. All measurements, no simulations. NOTE: the companion 83-model M4 local spread (2026-08-01) was lost to an uncommitted file deletion and will follow as a linked deposition after re-run — this register note is part of the record.