The Pre-Divergent Layer of Biological Strain: A Descriptive Boundary on Shared Conditions Prior to Divergent Disease Expression v1.2

This descriptive, non-causal document identifies a shared structural layer that exists prior to divergent biological resolution across conditions such as cancer, autoimmune illness, metabolic disease, psychiatric classification, and neurodivergence exposure. It does not explain disease, assert causation, propose unifying mechanisms, or recommend intervention. Its sole function is to name the last point at which multiple biological outcomes remain structurally comparable before resolving along distinct physiological or interpretive pathways. The document restores comparability without synthesis and is intended as an orientation-only boundary artefact. This work is closed and non-canonical. Version Note (v1.2) This version introduces a non-canonical descriptive appendix appended to the end of the document. The appendix provides orientation-only closure notes clarifying how the pre-divergent layer of biological strain relates to illness interpretation, psychiatric classification, metabolic illness, and neurodivergence exposure.It does not introduce new claims, mechanisms, or synthesis. No canonical sections have been modified.No definitions, scope limits, or boundaries have been revised, extended, or reinterpreted. The primary document remains descriptive, non-causal, and closed.The appendix exists solely to complete interpretive context already presupposed by the core work. All prior versions remain valid and citable. This work is subject to the Irwin Canonical Corpus Freeze Declaration (2026).