Global Membrane Cancellation and Timeless Action: Why Brane-Antibrane Tachyon Condensation and Global CPT Conjugation Reduce Spacetime to an Internal Observer Artifact

We demonstrate that the global cosmic metric constitutes a strictly zero-sum physical system, relying exclusively on Standard Model gauge symmetries and canonical quantum gravity, without recourse to phenomenological exotic physics. Recent observations from the LHCb experiment at CERN concerning the ultra-rare decay of neutral beauty mesons (B0_s -> mu+ mu-) establish rigid constraints at the 10^-21 meter scale, effectively eliminating heavy gauge supersymmetry (SUSY) and leptoquark extensions. Concurrently, DESI 2024 baryon acoustic oscillation measurements indicate a dynamic dark energy equation of state (w0 > -1, wa < 0) capable of achieving turnaround (H = 0). Combining these constraints, we model cosmic expansion not as the injection of absolute positive energy, but as an elastic differential polarization of the local string fabric. Using two-scalar Weyl conformal invariance, the Gauss-Codazzi extrinsic curvature split, and Sen's tachyon condensation theorem, we prove that positive matter-radiation stress-energy is continuously cancelled by negative gravitational field pseudo-tensors. Consequently, the global Wheeler-DeWitt Hamiltonian vanishes identically (H|Psi> = 0), reducing chronological duration and spatial expansion to purely internal relational artifacts.