GRUT Theory of Everything v2.0 Canonical Synthesis after Phase III The Grand Responsive Universe Theory (GRUT) is presented as a unified theoretical architecture grounded in the principle of Universal Responsiveness: the hypothesis that physical law emerges from a causal, finite-bandwidth, memory-bearing vacuum medium rather than from a static background geometry. This upload presents the GRUT Theory of Everything v2.0 synthesis, integrating the completed Phase I–III program into a single canon-synchronized framework. The manuscript is organized by derivation level and explicit status ladder: LOCKED / OPERATIONAL, CONSTRAINED / CANDIDATE, FUNDAMENTALLY OPEN, and POST-PHASE-III EXTENSIONS. Phase I (Locked / Operational) establishes the weak-field memory sector: a causal, screened, finite-bandwidth metric response with canonical constants, a retarded relaxation structure, and reproducible operator logic for modified Friedmann evolution and memory-weighted weak-field dynamics. Phase II (Locked / Operational in its falsifier framework) extends the same substrate into the quantum bridge, preserving the cross-sector logic that connects weak-field memory structure to decoherence and quantum-to-classical transition. Phase II remains part of the core GRUT architecture rather than a disconnected add-on. Phase III (now structurally closed at the effective covariant-framework level) extends GRUT into the strong-field collapse and black-hole sector. The earlier finite-radius endpoint is analytically and numerically rejected as an Lstiff×VtolL_{\text{stiff}} \times V_{\text{tol}}Lstiff×Vtol artifact. The constrained endpoint lawϵQ=αvac2=1/9\epsilon_Q = \alpha_{vac}^2 = 1/9ϵQ=αvac2=1/9, βQ=2\beta_Q = 2βQ=2 yields the current candidate equilibrium Req/rs=1/3.R_{eq}/r_s = 1/3.Req/rs=1/3. The transition is governed by the order parameter Φ=aoutward/ainward,\Phi = a_{outward}/a_{inward},Φ=aoutward/ainward, and the interior is reclassified by PDE and effective covariant closure as mixed-viscoelastic, with structural identity ω0τlocal=1\omega_0 \tau_{local} = 1ω0τlocal=1 within the present closure and quality factor Q∼6Q \sim 6Q∼6–7.57.57.5. The preferred current covariant formulation is Candidate 2, an auxiliary memory field TμνΦT^\Phi_{\mu\nu}TμνΦ, treated as a constitutive-effective closure rather than a first-principles action-derived stress-energy sector. Effective boundary/junction treatment, transition-width embedding, first-pass Love-number estimates, bounded spin/Kerr extensions, and bounded nonlinear-response analysis are included. Under the current Schwarzschild-like exterior assessment, static exterior observables remain null to leading order, while the principal candidate falsifier channel is dynamic ringdown structure at the ∼1.1%\sim 1.1\%∼1.1% level. This release is not presented as a final first-principles derivation of the full GRUT program. The manuscript explicitly preserves the remaining open closures, including action/Lagrangian derivation of the memory sector, tensorial generalization, full field-equation-level junction theory, precise Love-number calculation, full Kerr closure, nonlinear strong-amplitude dynamics, and possible unification of αmem\alpha_{mem}αmem and αvac\alpha_{vac}αvac. GRUT is therefore presented here as a self-consistent effective covariant framework whose Phase I–III sectors are now integrated into a unified synthesis, whose constrained candidates are clearly separated from locked results, and whose remaining first-principles gaps are sharply localized rather than diffuse. GRUT Phase I: https://zenodo.org/records/18520789 GRUT Phase II: https://zenodo.org/records/18917257 GRUT Phase III: https://zenodo.org/records/18986085 GRUT ResponsiveAI: https://zenodo.org/records/18993690 Structural Closure: https://zenodo.org/records/18008060