Arbitrary-Precision OUXSPACE α Propagation from a Closed-Form Fine-Structure Candidate

This technical note publishes a reproducible arbitrary-precision layer for the OUXSPACE / STRING THEORY-2 fine-structure programme. Its primary mathematical object is the closed form αₛₜ₂ = 105/[2π(2125+2√6810)], generated by the declared OUXSPACE closure chain. The note provides: (i) the exact algebraic compression of the model chain; (ii) 100-digit reference values; (iii) comparison with the current high-precision Cs, Rb, electron-magnetic-moment/QED, and CODATA-2022 determinations; and (iv) a deterministic 10,000-digit companion plus generator script for independent numerical reproduction and regression testing. The purpose is to expose the formula, its structural dependencies, and its reproducible numerical consequences in a compact auditable form.