Observer Determinism: A Unified Cosmological Framework Reconciling 100% Determinism and Conscious Agency via Path-Selection

Classical Newtonian mechanics and General Relativity describe a strictlydeterministic universe governed by invariant physical laws. Conversely, standardcognitive science often struggles to account for conscious agency without eitherinvoking non-physical force creation or reducing consciousness to an illusorybyproduct of complex neural computation. This paper introduces ObserverDeterminism (OD), a unified framework demonstrating that 100% cosmologicaldeterminism and genuine conscious agency co-exist as a single seamlesscontinuum. We establish that:The physical state matrix of the universe and all possible trajectories are 100%deterministic and pre-configured within the universal state space.Conscious agency operates not by creating new physical force or altering baselinethermodynamics, but as an informational path-selection mechanism (ΔI) that choosesthe optimal trajectory from the existing 100% deterministic matrix.Consciousness is a fundamental cosmological field predating biological neuralhardware, extending past Planck time (t → 0) and the Last Universal CommonAncestor (LUCA), as evidenced by non-neuronal adaptive intelligence in plants andsingle-celled organisms