Foundational Ontology and Cosmology of the ψ Theory Conceptual Closure and Companion to "Emergent Geometry, Quantization, and Cosmological Dynamics from a Single Nonlinear Field"

This document is a conceptual and ontological companion to the main ψ theory paper. It does not introduce new equations, parameters, or phenomenology, but clarifies the foundational meaning of ψ, time, space, causality, and cosmological genesis within the existing framework. The document is intended to be read alongside the primary ψ publication.