The Present as a Projection Operator in the ψ₀–OCM: A Constraint-Derived Realisation Principle from Action and Hamiltonian Structure

Standard physical theories do not provide a constraint-derived, observer-independent definition of the present moment. Within the ψ₀–OCM (Osborne Cosmological Model), the present is defined as the closure of admissible redistribution into stabilised PDS-1 configurations. From this principle, a ψ₀–Now Operator is derived directly from the constrained ψ₀ action and embedded within the ψ₀–Wheeler–DeWitt framework. This operator acts as a projection on the space of possible configurations, selecting the subset corresponding to physically realised existence. The commutator between the Now Operator and the ψ₀ Hamiltonian provides a dynamical diagnostic that distinguishes regimes of stable realisation from redistribution-driven transition, thereby defining conditions for the persistence or reselection of the present. This construction introduces a fundamental extension of physical theory: dynamical laws determine how configurations evolve, while a closure-derived operator determines which configurations are realised. The Now Operator therefore functions as a selection counterpart to the Hamiltonian. A path-integral node-lattice formulation and an emergence-ladder embedding are developed, establishing a unified framework in which the same closure-based mechanism is formulated consistently across quantum, classical, and cosmological regimes. The ψ₀–OCM thus provides a unified operator-level account of the present as a projection from possibility to realised existence, supplying a formal selection principle absent from standard physical theory.