ML transport surrogate

Frozen result

What was computed

Ridge deg-3 surrogate Q(fG,Ti0,H98): R2=0.9983 on 100 held-out [T], RMSE 0.088; anchor Q=3.0763 reproduced; GNN stays cloud

Reproduce this

# Reproduce BR-L2-A12 against the frozen record
pip install kronos-toolkit   # github.com/KronosFE/kronos-toolkit
python -c "from kronos_toolkit.verify import run_regression; run_regression()"
# BR-L2-A12 is anchored in the 2026-08-27 freeze spine (verdict: reproduced).