Long-term agent memory is usually treated as select--store--retrieve, but retrieval does not decide whether contradictory, superseded, retracted, deleted, or stale records may support an outgoing claim. We introduce Governed Persistent Memory (GPM), an auditable bitemporal state-transition model with source-bound admission, derived lifecycle state, current public barriers, and fail-closed structured release. Five executable clauses cover ledger integrity, source binding, conflict isolation, non-revival after retraction or deletion, and exact claim closure over a fresh view at one verified head. Blogger's Review: This paper introduces a new memory management model, called Governed Persistent Memory (GPM), which ensures the consistency and integrity of long-term agent memory states. Through source binding and fail-closed release, GPM prevents contradictory and outdated records from supporting incorrect claims. Experimental results show that GPM matches all complete outcomes and demonstrates high efficiency and reliability in practice.