Paper LXII establishes the formal Effective Field Theory (EFT) for the MSDS framework. It features three core advancements: (1) An EFT derivation of the n=2.5 birefringence exponent using operator dimensions and loop-suppression arguments; (2) A physical model of the universal spin axis as a vector condensate with a calculated energy density of 0.142\% of the critical density; and (3) A new prediction for frequency-independent circular polarization of gravitational waves at the v^2 = 0.00017 level. The work includes a multi-decadal roadmap for experimental verification via optical lattice clocks and next-generation interferometers (LISA/Einstein Telescope).