Paper T16A: Corridor-Scale Coherence Ignition Fronts in the Holosphere Lattice From Single-Site Seeding to Spatial Propagation, Stalls, and Anisotropic Reach

We extend the current T16 preparation experiment to spatial response on the occupiedHolosphere contact network. A matched pair of trajectories shares its initial state and primer,then differs only by a local trigger. Their signed-density difference measures the additionalresponse to that trigger. We derive an exact regional relation between this response and thechange of contact offsets, and define sustained, source-connected reach, directional reach andradial response width. The construction removes an ambiguity in the former acceptance-basedfront: its acceptance score was one at zero signal amplitude. Executed calculations on the917-site FCC host reach five, four or two contact layers at diagnostic thresholds 10−4, 10−3 or10−2, respectively. At threshold 10−3, a primer of amplitude 0.25 delays first reach of layersone through four relative to the unprimed case, without changing maximum reach. Halvingthe integration step preserves every sampled connected-reach value while exposing six one-sitechanges in component size. The result establishes spatial response and preparation sensitivitywithin the adopted contact law. The original title is retained; the demonstrated front is anoperational response region, and a physical ignition or material handoff mechanism remains aseparate task.