Smithium: Element 126 and the Island of Stability, Forced by the Nuclear Magic Numbers

One axiom. One operation. Zero free parameters. Nuclear physics has chased the ‘island of stability’ for sixty years, its address shifting between proton number 114, 120, and 126 with each model. This paper fixes it. The nuclear magic numbers are forced — from three spatial dimensions, the fold’s doubling (spin), and the colour-three strong sector — as 2, 8, 20, 28, 50, 82, 126, 184, reproducing every known closure exactly: the 3D oscillator shells H(n) = (n+1)(n+2)(n+3)/3 = 2, 8, 20, 40, 70, 112 reordered by the strong spin-orbit M(k) = H(k−1) + 2(k+1). The next proton closure is 126 and the next neutron closure 184, so the island of stability is forced at element 126, neutron number 184, mass number 310 — named Smithium (Sh). Its chemistry is forced from the derived electron-filling order as Og 8s² 5g⁶, a g-block superactinide. No fitted parameter; machine-checked; reproduces from one command. A standalone result within the Smithian Fold Theory of Everything (SFTOE). Full corpus, code, and the run-it-yourself VERIFY.md protocol: https://github.com/MettaMazza/Smithian-Fold-Theory