This paper presents the proto-spinor as a minimal upstream closure object forced by admissible projection-based description with finite coherence capacity. Starting from proto-locality, meaning that no nonlocal relations are introduced by fiat, it proves that nontrivial admissible continuation requires a pointwise internal embedding, or a world-in-world extension at each localization site. Imposing outer neutrality together with refinement-stable memory on internal orientation loops forces a lift from SO(3) to Spin(3), equivalently SU(2), yielding proto-spinors prior to spacetime, dynamics, and Lorentzian signature. The paper then shows that stable identity under repeated return requires a triadic closure carrier structure consisting of circle bookkeeping for return consistency, lens redundancy transport for neutral realization equivalence, and nil termination for discrete survivorship. Classical Weyl, Dirac, and Majorana spinors are recovered as admissible encoding regimes of the same proto-spinor carrier under additional representability constraints, and twistor variables arise as a high-coherence encoding in a near-integrable corner. Finally, once Lorentzian chart structure exists from independent bookkeeping synchronization results, the proto-spinor induces a standard Spin(1,3) spacetime spinor bundle encoding on admissible slabs. The paper is structural: it does not assume equations of motion, Hilbert-space axioms, gauge groups, or numerical realizations as primitives. All results are conditional on the MTT admissibility spine and should be read as upstream classification theorems rather than as a complete dynamical or phenomenological completion.
Peter Nero (Sun,) studied this question.