Technical Extension of Coherent Orientation Sector Theory: Stability, Perturbations, Gravitational-Wave Signatures, and Cosmological Dormancy (OCDST Paper 2.1)

Orientation-Coupled Dark Sector Theory (OCDST) Paper 1/2 introduced an effective orientation-

field framework capable of reorganizing relic dark matter without modifying Einsteinian gravity

for baryonic matter. Paper 2/2 proposed a coherence-sector interpretation in which the effective

orientation field emerges from a deeper vacuum coherence geometry. The present work extends that

framework into the perturbative regime and investigates the mathematical conditions required for

observational viability. We derive stability requirements for coherence sectors, including kinetic

positivity, Hessian stability, and causal propagation constraints. We examine the influence of

coherence-sector fluctuations on gravitational-wave propagation, cluster-merger dynamics, cosmo-

logical evolution, and large-scale structure growth. A Weyl-curvature activation framework is

introduced to ensure that coherence-sector restructuring remains dormant during the early universe

while permitting activation within nonlinear astrophysical environments. We further synchronize the

Higgs-orientation portal with the gauge-invariant effective field theory construction introduced in

Paper 2/2. The resulting framework defines the mathematical and observational survival conditions

under which the coherence-sector interpretation of OCDST remains viable as a falsifiable proposal.