DCRP73/X72R56: Cylinder Mosaic Absorbed into the Turnover Branch

Continuing from DCRP72's reduction of the critical transparent tail to a multi-axis mosaic of straight cylinders, this round proves that the mosaic is not an independent third branch: from the axial local velocity-invariance already proved in D72, the stretching term within every active sector of the mosaic is identically zero, and the similarity vorticity equation reduces to D_sΩ=-Ω, so vorticity decays exponentially as e^{-s} along material paths with fixed direction; the corresponding enstrophy density satisfies D_s e_ω+2e_ω=0 and, after the similarity-volume correction, decays as e^{-(2-3γ)s}. Consequently, a finite material-sector cycle cannot recur periodically without replenishment — a periodic cylindrical state must carry a strictly positive inward enstrophy/material-replacement budget, which is exactly the defining feature of the existing T turnover branch. The conclusion is that the critical-cylinder-mosaic endpoint is fully absorbed into T, restoring the native global frontier to the 'active X vs. material turnover' dichotomy, and leaving DCRP74 to jointly analyze enstrophy turnover and PFET on the same finite annulus.