b1268544e0
R2-02 (S-6 range warning + S-8 disabled cells), R2-11 (Writable checkbox), R2-07 (PureAdd + PureRemove, rebuild=False — F10b MUST), R2-04 (younger-crash keep-oldest survives sole primary; oldest-crash reproduced the documented SBR asymmetry, not an R2 regression). R2-05 partial (deny unobservable under DisableLogin). R2-10/R2-03 unit-verified, live-trigger constrained.