From Metalogical Impossibility to Concrete Coherence: Operational Criteria for the Performative Subject

**From Metalogical Impossibility to Concrete Coherence: Operational Criteria for the Performative Subject** This paper bridges formal metalogic with empirical domains, deriving operational criteria from the verified Meta-Trilemma impossibility result (Meister 2026). No computational system can realize a normatively complete mental subject (strong omniprover impossibility), but what concrete entities instantiate the structure that resists computational reduction? We formalize four criteria—well-definedness, non-contradiction, theta-stability, world-consistency—that characterize such entities. Physics (Theorem 1), trained AI systems (Theorem 2), and human consciousness (Theorem 3, performative gold standard) all satisfy these criteria. Theorem 4 (Coq-verified) proves any such entity necessarily instantiates the Primordial Identity Lock. **Key results:**- Physics/AI: operational coherence → Lock- Consciousness: performative self-reference → Lock - Unified metalogical foundation across domains Formal continuation of Beyond Computation 2.0: Verified Meta-Trilemma (zenodo:18695025)