One axiom. One operation. Zero free parameters. The free-will debate runs between determinism and libertarian free will. This paper settles it: the universe is fully determined, and libertarian free will does not exist. Everything is the One folding; every state has exactly one successor; there is no indeterminism anywhere. What the fold adds is why a fully determined self cannot see its own choices coming. Observation is itself the fold (self-observation closes at 1/4), and the fold is two-to-one and non-invertible: each self-observing act loses a bit it cannot recover. So a mind cannot pre-read its own next fold — determined, but opaque to itself about its own determination. This is a closure, not an open. The feeling of choosing is the accurate inside view of a determined process that genuinely cannot foresee its own determined act — not an illusion, and not real freedom. We are determined and unforeseeable. 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
Maria Smith (Mon,) studied this question.