The causal overlay and its communication ledger

If a tick has supplied duration $\tau$, then $\Delta /\tau$ is the schedule-speed envelope. It is not extracted from entanglement, and its upper-bound support need not equal the actual influence region CheungEn05AC,CheungEn06B.

A logical wire routed by SWAPs with reserved blanks is the identity channel on its payload, including references. Following a topological order of a fixed routed circuit therefore preserves its complete instrument. If the payloads have compatible half-diamond allowances ${\eta }_v$, replacing them one at a time gives total error at most ${\sum }_v{\eta }_v$ by contraction. These are channel-routing statements, not metric reconstruction.