X72-20: Low-Amplitude Degeneracy Intermittency

Continuing from Round 19's one unresolved low-amplitude escape channel (|v|→0 while strain remains large), this round rewrites the inverse-amplitude carrying quantity as the second and fourth moments of the normalized strain K_S=|S|/r under the critical quotient mass measure dμ_Q=r³dx/Q³, and defines the intermittency ratio 𝔍_S=𝔼[K_S⁴]/𝔼[K_S²]². It proves that the second moment cannot unconditionally control the fourth moment (second-to-fourth moment closure is explicitly listed as a NO-GO without extra structure), and constructs a local affine witness — v=0 and λ₂(S_u)>0 holding simultaneously — showing that the zero set itself is not an automatically safe branch; it also establishes a low-amplitude trichotomy (amplitude cliff ∨ directional pivot ∨ gauge-Hessian blow-up). The route halts at STOP-C24 (normalized-deformation intermittency / zero-set-degeneracy gap), passing the baton to the next round to track the dynamics of μ_Q and K_S themselves, rather than the location of the zero set.