The First Witness — Track A Pre-registration: The Folded-Pole Door (Public Hash Anchor)

Public SHA-256 anchor of the frozen Track A pre-registration of The First Witness: the folded-pole survival question (what remains of the Green-Porto quantum-vacuum discriminant, PRL 124, 251302, on the corrected decohered state), locked before any computation exists. File: FP_PREREG.md v1.0. SHA-256: 16c40dc8e8bf57446e302118fc5127c7bc12a0966b0468ddfc37725350323b21. Locked contents: fossil-vs-live axis, pointer-basis theorem with two named caveats as sole numerical targets, two-tier diagonality gate, bands with credences (0.60/0.20/0.10/0.10), operationalized mimicry falsifier, the arXiv:2604.18416 degeneracy band, UHF coexistence row. Prior anchors: results bundle DOI 10.5281/zenodo.21343933; pre-registration DOI 10.5281/zenodo.21338642; predecessor (The Last Witness) DOI 10.5281/zenodo.21309248.