Physical ports, not abstract cell labels

Choose finitely many persistent spatial marks

Register $v$ at slicing parameter $s$ is localized at

These marks are additional simulation data.

VII-F's abstract location transport is the identity on persistent labels, but some labels change their geometric realization. For example, an edge that formerly meets the particle need not meet it after the event. Identity of a cell name does not prove identity of a physical localization or a causal transport route. We therefore do not use that transport as a worldline certificate.