A Pre-Registered Fine-Structure Boundary from a Monitored Wilson-Endpoint Response: alpha^-1(0) = 137.0359991069051, Registered Mid-Fork

Abstract

Addendum, 11 August 2026 (version 2). This version corrects the registered acceptance number from 137.035999106904 to 137.0359991069051. The change is numerics, not physics: the original value came from a Richardson extrapolation that fitted 1/N² to a sequence converging as 1/N⁴, overshooting by its own error bar. The shift is 8×10-6 ppb — 10-4 of the sharpest primary determination's σ — so no comparison against any determination moves, and the kill rules of the original registration are unchanged. The addendum also records derivation upgrades that remove freedom from the registered position (a grid-free closed form for the second-order kernel; a blind adjudication excluding a rival second-order class; and a termination result making the boundary a complete degree-2 polynomial rather than a truncated series), the named premises that remain conditional, and pre-registered exposure accounting for one named outside-sector extension. See qed_alpha0_endpoint_addendum_2026-08.pdf. A Pre-Registered Fine-Structure Boundary from a Monitored Wilson-Endpoint Response: alpha^-1(0) = 137.035999106904, Registered Mid-Fork. Seventh registration, first registered-while-disfavoured (-3.9 sigma a_e channel, +2.3 Cs, -9.0 Rb, open 5.5-sigma recoil fork). K1/C1/C2 rules frozen; delta a_e corollary -5.0(1.3)e-13; C10 escape priced at ~5x X024. This record is part of the finite-QEC substrate / It-from-Bit publication refresh.