X72-58: Small-Viscosity Singular Adjoint Limit and the Bounded Neutral Correction Term

Building on Round 57's conjecture that 'the central coefficient tends to zero linearly at small viscosity,' this round no longer extrapolates numerically toward small viscosity, but instead rescales the odd and even parts of the adjoint recursion at different scales, deriving an endpoint system that depends only on the square of the viscosity: at zero viscosity the even part is a minimal Euler mode with super-factorial decay, while the odd part is not an analytic tail at all but a bounded neutral mode tending to a constant — from which an exact asymptotic law and a stable endpoint slope constant are derived. This round also points out that the value Round 57 obtained by raw extrapolation from very shallow viscosity — which appeared to correspond to the endpoint constant — is in fact an artifact contaminated by singular truncation, not one genuinely derived from the correct endpoint system, thereby correcting the previous round's basis for inference. Route halts at STOP-C62 (bounded-neutral Green/Jost endpoint gap): although the value of the endpoint slope constant is numerically stable, it has not yet been rigorously proved within the full infinite-dimensional operator topology, handed to the next round to rigorously construct the endpoint Green/Jost functional; this round also includes a numerical-verification script and CSV data.