Paper T9: Interaction Bookkeeping via Junction Admissibility in a Coherence Lattice

In this paper we introduce an interaction formalism for Holosphere Theory in which interactions are not represented by mediator fields or perturbative vertices, but by discrete junction reconfigurations of coherence channels in a rotating angular lattice. Interaction events are governed by a compact admissibility contract requiring triadic closure preservation, local strain-budget balance, and invariant memory and chirality consistency. These constraints define a small set of canonical junction outcomes—transfer, exchange, absorption, emission, and echo—which together replace conventional vertex bookkeeping with topology-first reconfiguration rules. We support this framework using two operational diagnostics. First, a Monte Carlo proxy model exhibits a sharp admission boundary in a two-parameter control space, separating admissible reconfiguration from structured failure modes. Second, we analyze the Weihs longdist32 timing continuum as a junction-admission diagnostic, identifying a window- and offset-dependent admission knee that persists across pairing policies, localizes parity disruption to a narrow boundary layer, and vanishes under shuffled-time null controls. This work does not derive force laws or coupling constants. Instead, it establishes an interaction-layer bookkeeping framework and falsifiable admission KPIs that precede force-law derivations. The results demonstrate that interaction behavior consistent with thresholded, geometry-first admission can be identified both in controlled proxy models and in high-statistics timing data, providing an empirical anchor for the junction-admission picture.