We present the Atemporal Tablet Framework (ATF), a complete geometric ontology that derives spacetime, quantum mechanics, and gravity from a single mathematical structure. The universe is modeled as a fiber bundle T ->(π) M where T is a static higher-dimensional manifold and M is emergent 3+1D spacetime. Temporal dynamics arise from projection operators Πt : T -> M extremizing a projective action SΠ. Quantum states are epistemic distributions over fibers, with the Born rule emerging naturally via measure disintegration. Measurement corresponds to topological phase-locking without wavefunction collapse. Einstein’s equations arise as equations of motion for Πt, while quantum fields emerge as fiber vibrations. The framework makes specific testable predictions: sidereal anisotropy in qubit decoherence ε = 1.23 × 10^-8 ± 3 × 10^-9 (derived from holographic scaling) and modified dispersion relations at scale EP / sqrt(ε). We prove a reconstruction theorem establishing that spacetime observations can determine the underlying geometry, and demonstrate that Standard Model particle content emerges naturally from Fx ≅ CP3 × S5 / Γ fiber geometry. ATF provides a mathematically rigorous, experimentally falsifiable foundation for quantum gravity that resolves long-standing interpretational issues while making concrete predictions testable with current technology.