This monograph-length investigation examines the cosmological implications forced by the empirical results established in Volume I of the Causal Response Framework. Using the same regime-based, falsification-driven methodology, the work asks not which cosmological models are preferred, but which classes of cosmological behavior remain admissible once instantaneous gravitational inference is excluded.

Rather than proposing a forward cosmology, the analysis proceeds by systematic elimination. A sequence of preregistered adjudication criteria and empirical probes tests whether any admissible cosmological response can remain consistent with observed temporal ordering, spatial coherence, environmental modulation, large-scale structure persistence, and expansion history constraints. The surviving constraint structure restricts admissible behavior to a narrow class of environment-conditioned, history-dependent cosmologies. The volume concludes by identifying this residual class and introducing a descriptive classification—spacetime as an aging medium—without asserting additional ontology or mechanism, deferring cosmological completion to subsequent volumes.

This book is intended to consolidate and formalize the descriptive framework that survives the eliminative analysis of Book I. Rather than introducing new dynamical mechanisms or cosmological fields, the volume focuses on the structural interpretation of the residual admissible class, treating spacetime as a history-dependent medium whose large-scale behavior reflects accumulated response rather than instantaneous inference. The book is currently in the process of compilation, and its final scope and contents will be presented upon completion.