FRC 566. 030 applies the canonical reciprocity law dS + k* d ln C = 0 through one explicit information-unit realization. With the predeclared representation k*₌ₔ䂸₀ₓ=1, it computes Q=S+k*₌ₔ䂸₀ₓ ln C exactly on the von Mises/Kuramoto family. Q is non-constant and reaches its unique stationary point at kappa r=1, kappa=1. 608279 and C=0. 621782. The exact identity is dS/d ln C=-kappa r, hence dQ/d ln C=k*₌ₔ䂸₀ₓ-kappa r. This stationary point is dQ=0; it is not sigma₅66=0 unless an explicit environment model supplies that additional equality. The family contains no bath and therefore measures neither irreversible production nor entropy export. A companion Langevin closure tests those quantities in one model class and finds no universal erasure floor in its declared normalization.
Hadi Servat (Fri,) studied this question.