Paper T15A: Holosphere Lattice Engine (HLE v1) Deterministic Update Rules, Contracts, and Validation KPIs

This paper introduces the Holosphere Lattice Engine (HLE v1), a deterministic simulation engine for coherence propagation on a fixed lattice of triadic rotational states. HLE v1 specifies a locked update contract, including the per-node state representation, six-neighbor topology, boundary policies, and a synchronous two-stage update schedule consisting of sub-threshold preconditioning followed by a hard coherence gate and commit propagation. The engine defines an observer-facing readout rule for reach and time-to-arrival and a minimal, KPI-governed validation suite with fixed-named artifacts bound to a reproducibility manifest. Within this framework, propagation is not diffusive or superpositional: transport is blocked below threshold and ignites abruptly once admissibility conditions are satisfied. All per-run dynamics are deterministic; probabilistic summaries arise only through seeded disorder fields or parameter sweeps recorded in the manifest. HLE v1 provides an audit-grade, reproducible baseline engine that downstream Holosphere papers can cite without redefining state variables, update semantics, or readout conventions.