What was computed
Divertor closing window / advanced-divertor requirement — ROLLED UP to DONE from reproduced sub-solves (A11b-s3 1-D SOL/detachment + A11-SUM divertor-portfolio stacking). RESIDUAL / owed fidelity upgrade: full 2-D SOLPS-ITER coupled detachment solve (mesh-blocked earlier). Reduced-fidelity CLOSED
Reproduce this
# Reproduce BR-L2-A11b 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-A11b is anchored in the 2026-08-27 freeze spine (verdict: estimated).