Toward Versioned Epistemic Memory for Reliable Agentic AI: Convergent Evidence from Performance Optimization, Spatial Reasoning, and Human-AI Collaboration

Three independent research efforts approaching AI reliability from distinct problem framings have converged on the same architectural pattern: versioned persistent memory combined with fresh-instance verification. Karimi et al. (MIT, 2026) arrived at this pattern through performance optimization of agentic systems, naming the failure mode it addresses the coherence ceiling. Zhang et al. (2025) arrived at it through spatial memory coherence in LLM navigation agents, implementing version-controlled memory graphs with source observation tracking. A sustained human-AI collaboration (Ellenwood, 2026) arrived at it through epistemic accountability requirements - the need to detect and correct narrative-reinforced overclaiming in long-context collaboration. This paper documents the convergence, describes what each implementation contributes, and proposes this architectural pattern as a candidate structural requirement for reliable agentic AI systems - a hypothesis motivated by convergent evidence but not yet validated by controlled experiment. Three properties the human-AI collaboration implementation includes - cryptographic integrity verification, Bitcoin-anchored timestamps, and ORCID identity attachment - are architectural features addressing accountability requirements that performance and spatial coherence systems are not designed to satisfy. Their epistemic value awaits empirical evaluation in the Memory Chain v2 implementation currently in development.