Product Domain Engine The meta-system. Every product tied to a domain is an instance of the same operation: formalize informal knowledge into computable structure, then express that structure through four independent rhetorical channels. This skill does not invent new patterns. It names a system that was already running across four products ( , , , ) and was being re-derived every time. Naming it converts re-derivation into composition. What This Is A conductor , not a monolith. The PDE sequences seven existing skills through a five-phase protocol, adds the rhetorical-mode framework that none…