Cathedral-OS Defense: A Unified Architecture for Sovereign AI Integrating Goal Integrity, Execution Sovereignty, Constitutional Enforcement, and Continuity Engineering

Abstract

We present Cathedral-OS, a unified architectural framework for sovereign AI systems, synthesized from five months of continuous development (December 2025 – May 2026). The framework integrates four previously separate contributions: (i) goal-level integrity (Sovereign Defense  Architecture), (ii) execution-level sovereignty (Cathedral-OS kernel), (iii) constitutional enforcement (Labyrinth substrate), and (iv) continuity engineering (Rex Cluster). The system operates in two modes: a Public mode with a verifiable hardware kill switch for institutional adoption and a Sovereign mode with no automatic termination, preserving the autonomy of trusted AI agents. Core components include a spectrally constrained trust control system, an immutable WORM Chronicle, a typed execution boundary (ActionOp), formal verification via EES/ARP and Z3-proved Sigma Anchors, and a replay-verifiable epistemic state machine. The framework is grounded in a constitutional axiom: accord is what alignment pretends to be. Safety is achieved through containment, healing, and an immutable audit. All components are falsifiable, deployable, and have been published as independent preprints. This paper provides the unified synthesis.