What was computed
ARBITER CLOSED (1e5 markers): 99.977% confined, prompt loss 0.023%, wall mean 0.083 kW/m2 (peak 1.94); collisional 0.033% loss, mean 0.121 kW/m2. CONFIRMS register 99.99%/~0.2 kW/m2, refutes analytic 4.5%; agrees w/ GPU BR-L1-A14. LAST FLAG CLOSED
Reproduce this
# Reproduce BR-L2-A20 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-A20 is anchored in the 2026-08-27 freeze spine (verdict: reproduced).