Phase-Model Paper 07: A Phase-Randomization Closure Model for Decoherence

Version note (v2.0, 2026-04-06): This release updates editorial consistency across the Phase-Model series (Papers 01–13), including reference formatting, author-name normalization, and removal of local-path citation strings. The core model claims and rejection logic are unchanged unless explicitly stated below. This preprint proposes a phase-randomization closure model for decoherence. The framework describes coherence decay as competition between phase diffusion and synchronization recovery, links phase-variance dynamics to observable coherence indicators, and provides explicit falsifiable predictions and rejection criteria across multiple experimental platforms.