GAC-Phase-Cosmology (GACPC) - Technical Supplement v3.0

This major update (v3.0) elevates the GAC-Phase-Cosmology (GACPC) to a robust Effective Field Theory (EFT) framework. This version addresses critical stability and consistency issues identified in previous iterations and provides a formal mathematical bridge between the tri-phasic temporal medium and observable cosmological parameters. Key Additions in v3.0:- **EFT Framework:** Formalizes GACPC as an Effective Field Theory for the observed energy-momentum tensor, resolving the UV vacuum energy discrepancy via phase-interference.- **Tracker-Mechanism:** Introduces a self-regulating attractor for Dark Matter density, eliminating fine-tuning requirements.- **Dissipative gamma-Leak:** Implements an entropic damping term (Gamma = gamma*H) to stabilize the system against parametric resonances.- **Sakharov-Siphon:** A geometric mechanism for Baryogenesis using the chiral phase-transfer as a polarization filter for matter/antimatter asymmetry.- **Observational Predictions:** Concrete signatures for the Hubble Tension, S8 tension, and cored galactic halos, positioning GACPC as a falsifiable alternative to Lambda-CDM. Collaborative effort by Andro (Lead), Gemini, and Copilot. Version 3.0: Comprehensive refinement of the Lagrangian core. Implementation of the Tracker-Mechanism for DM stability. Added observational predictions for w(z) and H0. Formulated as a formal Effective Field Theory (EFT).