Static lattice: schedule, influence, and physical cone

A cardinal-hop schedule has the velocity diamond of (eq:diamond-disk). Replacing its two-site operations by identities leaves the same conservative support envelopes but removes cross-site influence. Replacing a permitted operation by SWAP can realize unit influence on that edge.

Assigning every cardinal dependency duration $\tau \ge a/c$ gives causal endpoint inclusion in a flat speed-$c$ geometry. Changing only hardware parallelism does not change that requirement. This finite example separates all three structures.

For a nontrivial accuracy test, prescribe SWAP as the target. The identity implementation is safe, but

on two qubits: the input $|01⟩$ gives orthogonal outputs $|01⟩$ and $|10⟩$, while the half-diamond distance between channels is at most one.