Unified Consciousness Theory I: Structural–Experiential Identity and the Continuity from Physical Process to Conceptual Self

TA-TR-2026-20 v1.2, a linked successor to UCT I v1.1. The revision reorganizes the foundations around one tokenwise Structural–Experiential Identity commitment, derives Universal Nonempty Experience and scoped structural continuity, formalizes No First Conscious Ancestor and fine-grained structural chains, and preserves explicit ontic/view/estimate and empirical-bridge firewalls. C1 remains a strong metaphysical commitment; the work is not peer reviewed and does not claim empirical proof, certified historical priority, a unique subject selector, or a unique consciousness metric.