Stability Engine v4.1: Structurally Consistent Implementation Scaffold for Multi-Agent Continuity Enforcement

Stability Engine v4.1 is a structural continuity architecture for multi-agent AI systems. It enforces substrate-level invariants including identity immutability, hard-gated capabilities, strict memory-tier separation, and geometry immutability through a layered contract stack and a centralized Invariant Interposer. This release includes the full specification, a runnable implementation scaffold, a hostile architectural audit, a targeted remediation pass, and a post-remediation re-audit. The current artifact demonstrates the architectural routing hierarchy in the runtime path, including TSRL observation, attribution-preserving routing, recursive stability certification, Interposer-gated geometry access with live sanitization, and graduated drift enforcement. v4.1 is not a finished product and does not claim adversarial hardening, production readiness, cryptographic security, or hardware-enforced isolation. Its enforcement is logic-gated and cooperative. Collaborator modules including URIEL-3b geometry, Cilow persistent memory, and Presence Engine remain interface-defined with mock backends. Operational units including AdSim, Defense, and Integrity are specified but not yet implemented. This release is suitable for architectural review, peer verification, integration planning, and continued collaborator-facing development. Notes:This release should be read as a structurally consistent implementation scaffold with cooperative enforcement boundaries. It is above proof of concept and below integration-ready.