Explicit stations, buffer, and schedule

The source register remains at $A$. The payload's reference entanglement is preserved, not generated by the cone. On any canonical accepted branch, replacing the source payload $P$ by $|0^p⟩$ or $|1^p⟩$ produces orthogonal outputs at $B$, a unit signalling witness along the allowed route.

For $m_a\ne 0$, the delivered certificate describes another catalogue cone. The causal routes in (eq:complete-transport) still use $g_{{\mu }_0}$.