This supplement documents the intellectual trajectory that led to the Category Mistake framework and the Forward-In-Time-Only (FITO) analysis presented in our recent arXiv papers. The ideas crystallized over fifteen years of research, conversation, and engineering practice -- beginning with a 2014 Stanford EE380 lecture on the physics of time in computing, sharpened through a 2016 email exchange with Leslie Lamport following a Papers We Love presentation of his seminal 1978 paper, and matured through the development of Open Atomic Ethernet (OAE). This document traces the concept development from its origins in the physics of entanglement and background-free time, through the recognition that Lamport's "happened-before" relation embeds a category mistake, to the practical engineering consequences documented in "Why iCloud Fails" and "What Distributed Computing Got Wrong." It is intended as archival supplementary material for future arXiv submission.