FrostGrid Fundamental Mechanics

This publication package is designed to be provided directly to an AI system and be ready for interactive use. The Frostyverse begins from a deliberately minimal premise: before adding more kinds of fundamental objects or fields, first ask how much of a universe can be constructed from one physical thing. In the Frostyverse, that thing is the FrostSegment, treated as the sole fundamental material substance of a fixed-connectivity, deformable three-dimensional FrostGrid. This paper presents the first consolidated publication of the FrostGrid fundamental mechanics. FrostLines, FrostNodes, FrostCells, complete FQs, SFNs, and sub-FQ states are organizations or configurations of FrostSegments and their FrostLinks rather than additional substances. Complete FQs are coherent three-axis FrostGrid energy patterns, while sub-FQ denotes distributed microscopic FrostSegment/Grid deformation or excitation. FrostLinks carry finite local causal information, with newly generated causal dependence advancing by at most one shell of directly coupled FrostLinks per universal C interval. The central result is a constrained reversible first-order action class for the exact FrostGrid state and its associated regular evolution law. The framework is structurally locked at the constrained fundamental action-class level rather than claimed as a completely parameterized numerical Lagrangian. The constitutive data required for complete nonlinear numerical parameterization remain explicitly identified as open. The accompanying glossary and preserved research archive provide current terminology and development provenance.