All 19620 source columns audited exactly: primal feasible; joint, turnover and service bounds recomputed.
Plateau: exact witness Q=6.500480304680; upper=6.500480497416; service certified through 5172619/5000000.
Variation <= 1.9273609e-07; rounded-endpoint service gap 9.44791832e-08.
The sulfur bypass cancels all chemical carriers but retains eight auxiliary terms.
Paired synthetic contradiction rejected: True; identity solver error 7.8e-12.
Finite carrier kinetics are illustrative; source feasibility is not a kinetic or physiological tolerance claim.