Title: Paper 0B: Critical Regime Constraint Standard (CRCS) — Prohibition of Exogenous Forcing Under Observability Collapse (v1.0)

This paper formalizes a non-negotiable constraint derived from Zero Leap Theory (ZLT): when a system enters a critical regime (defined by viable observability collapse $O < O_{\min}$ and/or critical-threshold crossing), any intervention requiring mandatory exogenous signal ($S_{ext}$) or decision forcing increases expected entropy production and irreversibility. In such regimes, the only admissible intervention class is via negativa ($V^{-}$). Version 1.0 establishes the core operational framework, including three consolidated amendments: A strict proxy-vector definition of Observability ($O$) to prevent measurement illusions. A Kinetic Substrate Preservation clause ($V^{-}_{kin}$) distinguishing physical collapse from state irreversibility. A Tiered Duty-to-Rescue structure that prevents operators from evading minimum duties through calculated ignorance ("hiding"). This standard provides the operational definitions required for the IAS-CRIT (Integrity Assurance System - Critical) kernel specification.