The Dual-Signal Governor: A Control-Plane Pattern for Drift-Aware Systems

Your drift detector fires. The session looks clean. You roll back anyway. That's the false positive problem — and it's not a threshold tuning issue. It's architectural. Embedding-based detectors measure geometric displacement in vector space. They have no model of semantic trajectory, logical flow, or whether a session that drifted away has returned. Once the threshold trips, it stays tripped. This post documents a working fix: a dual-signal governor implemented in drift_orchestrator that introd