Integrating Drift Physics with Substrate-Anchored Governance: A Unified Framework for Governing Multi-Agent Systems

Multi-agent systems exhibit drift physics — emergent, systemic, synchronized divergence across agents that no behavioral enforcement framework can prevent. Traditional governance frameworks rely on observation, which cannot survive scrutiny or scale. This whitepaper presents a unified architecture for governing multi-agent systems. The APR-Series governance stack — APR-Shaper (classification), APR-Guard (enforcement), APR-Lite (chronicle) — is presented as a reference implementation of this architecture, built to address the constraints identified across the fifteen preceding papers in this series.