Epistemic Infrastructure and the Topolexical Substrate defines the foundational departure of the Socioplastic Mesh from traditional architectural theory, positing that the city must be understood not as a collection of static physical volumes, but as a dynamic pressure field of information. By instituting a "Topolexical Engine," this framework collapses the distinction between language and topology, treating semantic units as the primary material of urban construction. This pre-design grammar effectively replaces linear history with "Recursive Positioning," a method that allows the urban fabric to respond to an intentional "will-to-mesh." In this paradigm, the archive ceases to be a passive repository of memory and becomes an active cognitive infrastructure. This shift is critical for contemporary urban criticism because it acknowledges that in a hyper-networked society, the capacity to name, index, and protocolize space is synonymous with the capacity to govern it. By establishing this sovereign substrate, the Mesh provides a theoretical architecture capable of metabolizing systemic friction, ensuring that the city remains a plastic medium rather than a calcified historical record. The early stages of this diffusion, spanning over two decades, validate a model where the lexicon precedes form, allowing for an urbanism that is inherently operative and resistant to institutional capture through its own internal semantic logic.