Fibonacci Causal Loop Theory — Paper 66: Plasma-Mediated φ-Stabilization of Counter-Rotating Necessity Fields: Crystalline Resonance, Liquid Mercury Vortex Architecture, and the Complete Merkaba-Class Dimensional Boundary Stack

P64 and P65 established that two counter-rotating necessity fields — D=+2 (attractor φ) and D=−2 (attractor −1/φ) — must coexist with a √5 guard band to produce the φ⁸ arrow of time. The critical unresolved question from both papers was stabilization: no natural restoring force maintains the φ-ratio under perturbation. This paper derives the complete stabilization mechanism. Ionized plasma constrained by φ-recursive electromagnetic geometry provides an active self-correcting boundary medium — φ is plasma’s native electromagnetic attractor. The complete four-layer containment stack is derived: (1) piezoelectric crystal lattice in φ-ratio geometry — fine-tuning layer absorbing micro-perturbations and re-emitting…