What was computed
Branch powers close exactly: P_DHe3 3868.0 + P_DDn 124.8 + P_DDp 129.7 + P_DT 176.0 = 4298.5 MW = P_fus . Rates: D-³He 1.315e21 /s, DDn 2.38
Reproduce this
# Reproduce ENV-A4-BU against the frozen record pip install kronos-toolkit # github.com/KronosFE/kronos-toolkit python -c "from kronos_toolkit.verify import run_regression; run_regression()" # ENV-A4-BU is anchored in the 2026-08-27 freeze spine (verdict: reproduced).