MeshEngine designates the operational threshold at which accumulated density ceases to remain merely massive and becomes dynamically force-bearing. Within Socioplastics [2506], it functions as the mechanism that converts nodes, relations, recurrences, DOIs, platforms, images, texts, and cross-references from the passive attraction of GravitationalCorpus into directional, transmissive, and generative agency. Its significance lies in refusing the notion of the network as an accidental web: the mesh is instead an engineered infrastructure, a constructed system of load paths, citation loops, scalar jumps, platform redundancies, and recurrent CamelTags through which epistemic matter begins to circulate with force. At the systemic level, MeshEngine activates density; at the structural level, it mediates StructuralCoherence, MapDimensioning, and VerticalSpine; at the practical level, it appears in DOI resolution chains, Project Index routing, Hugging Face and GitHub layers, and the wider Decágono of public dissemination. The architectural analogy is precise: as an urban mesh of streets, utilities, and social relations transforms population density into metropolitan flow, MeshEngine converts documentary accumulation into operative field power. A specific synthesis emerges in Core IV, where the operator enables diagonal reading across tomes and nodes, allowing the corpus to self-propagate rather than remain archived. Its conclusion is therefore decisive: MeshEngine is the bridge between mass and agency, ensuring that Socioplastics becomes not only extensive but forceful, inhabitable, and durable, a habitat navigated by HomoEpistemologicus as a living epistemic infrastructure. Antonopoulos, A. (2025) Socioplastics [2506]: MeshEngine. Zenodo. doi:10.5281/zenodo.19889492.