The inherited target-adapted route

Choose a straight developed spatial segment of length $\ell >0$ inside a regular convex tube of the inherited laboratory. After local clock readout, lookup, and a positive processing buffer, depart at time $t_{\mathrm{d}}$.

Install $n+1$ stations,

with payload registers $A_j\cong {\mathbb{C}}^{2^p}$, $p\ge 1$. Initialize $A_1,\dots ,A_n$ in independent blank states $\omega$. At hop $j$, exchange $A_{j-1}$ and $A_j$. The developed tick duration is $\ell /n$, so the cross-port dependencies are null; same-station dependencies are timelike.

The operational permission is explicit: a finite two-register SWAP is available on those declared tick-boundary ports, with the certified regular causal dependencies. This is the X-A-ST/I-B route permission, not a derived continuous-time interaction Hamiltonian. Classical report wires are separately declared causal.