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

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.