Retention Without Return: A Structural System of Irreversibility (The Non-Modal Structural System I)

This text fixes the minimal structural conditions under which irreversibility holds. Configuration is fixed as a difference-structure under structural constraint. Retention is fixed as structural persistence. No total integration is constituted. No return is established. Irreversibility is not introduced as a derived property. It is fixed as a structural condition determined by the absence of integration and return. Time is fixed where retention holds without return under asymmetry.