Addendum I: Boundary Conditions of Irreversible Reality

This addendum formalizes a set of boundary conditions governing admissible transitions between major structural domains in a constraint-based ontology of irreversible reality. The conditions specify when additional structure becomes necessary in order to preserve realized distinctions under irreversibility. No new axioms are introduced, no existing derivations are modified, and no conclusions of the primary framework are altered. The addendum functions as a compression and clarification layer, making explicit a sequence of non-causal, non-agentive boundary transitions implicit in the original work. It is intended as a standalone supplement to facilitate reference, critique, and cross-domain application.