Primordial Field Theory (TCP⊙): A Non-Local Effective Field Theory of Consciousness with Causal Observer Coherence Coupling

We present Primordial Field Theory (TCP ⊙), a non-local effective field theory where a fundamental complex scalar field Ψ(x) couples to Standard Model fields through an observer coherence functional C[Ψ](x). The theory is characterized by a Lagrangian with global U(1) symmetry, sixth-order potential allowing first-order phase transitions, and a retarded, causally propagating coherence functional. TCP reduces to the Standard Model in the limit of vanishing observer coherence (C[Ψ] → 0), introduces O(10^-3) corrections to quantum measurement probabilities dependent on neurophysiological coherence states, and predicts falsifiable deviations in delayed-choice interferometry (ΔV ~ 4 × 10^-3), Bell tests (ΔS ~ 5 × 10^-3), and molecular decoherence (ratio ~ 1.03). The coupling constant κ ~ 10^-9 J/m³ is consistent with cosmological vacuum energy density. All predictions are testable with current experimental technology using photon interferometry, entangled photon sources, and molecular matter-wave interferometry available in standard quantum optics laboratories. Version 3.2 strengthens the theoretical foundations by providing a systematic symmetry-constraint justification for the observer coherence functional C[Ψ], elevating it from a phenomenological ansatz to the canonical minimal representative of the admissible class of U(1)-covariant causal functionals.