The B_Full Theory: A Cyclical Cosmological Model of Dark Energy and Spacetime Satiation (Amended Final Version)

This paper proposes the B_Full Theory, a novel cosmological framework demonstrating that stellar-to-intermediate mass black holes act as active dynamic engines driving the accelerated expansion of the universe through non-local cosmological coupling. By resolving the empirical timescale and dimension divergence between macroscopic vacuum energy influx and microscopic Hawking radiation, we formulate a time-dependent field topology wherein the dark energy equation-of-state parameter enters a phantom regime (w < -1). To ensure quantum stability against catastrophic ghost instabilities, we embed this transition within a ghost-free non-minimal coupling framework. Integrating this mass-to-vacuum transition into the covariant thermodynamic framework, we project a realistic cosmological timeline for a flat universe (Ω_k = 0). The dynamic inversion at the spacetime saturation boundary is rigorously modeled via a non-linear scalar field potential phase transition. The cosmic infrastructure progresses through explicit energy saturation thresholds, culminating in a global topological phase transition and terminal systemic collapse at ≈ 412 billion years, offering a robust, testable alternative to the standard static ΛCDM paradigm.