X72-21: Critical-Mass Replicator Intermittency Dynamics

Continuing from Round 20's STOP-C24, this round no longer asks only where the low-amplitude set sits, and instead studies directly the deterministic dynamics of the critical quotient measure dμ_Q=r³dx/Q³ and the normalized strain rate K_S=|S|/r, establishing the critical-mass replicator-diffusion equation ∂_t m_Q+div(b_Qm_Q)=νΔm_Q+3(G_Q-Ḡ_Q)m_Q, and rewriting the intermittency ratio as the measure-separation form 𝔍_S-1=χ²(ν_S‖μ_Q). It proves that viscosity supplies an exact anti-intermittency mechanism, satisfying 𝔍_S'=-2νℱ_rel+𝒫_sel, but the NS relative-source production 𝒫_sel has undetermined sign and may cancel the viscous term; and clarifies that a 'probability-measure representation' does not amount to a stochastic ontology — this measure comes from a single deterministic state, not a random transition law. The route halts at STOP-C25 (relative-source / critical-mass-separation gap), passing the baton to the next round to decompose 𝒫_sel and the relative source back into concrete terms such as strain self-amplification and vorticity coupling.