Reader’s Note This paper is intentionally concise and austere in style. Its purpose is not to establish normative definitions or assert invariant authority, but to document and contextualise a set of externally governed Cognitive Memoisation artefacts (CM-artefacts). Normative authority resides exclusively in the referenced CM-artefacts, which define the permissible scope of reasoning across stateless interactions. The prose in this paper is explanatory and illustrative only. Readers seeking formal definitions, constraints, or verification criteria should refer directly to those artefacts. This structure is deliberate and reflects the method described. Abstract Cognitive Memoisation (CM) is a human-curated method for governing interaction with large language models (LLMs) under conditions of enforced statelessness, UI friction, and unreliable conversational continuity. This paper documents that CM was itself developed and stabilised using the same round-trip cognitive engineering principles it defines. Rather than relying on retained model state, transcript replay, or conversational continuity, all core invariants of CM were verified exclusively against externally governed artefacts. The development process was explicitly reflexive: exploratory dialog was treated as provisional, externalised into authoritative artefacts, reintroduced as governance, and exercised under loss, interruption, and boundary enforcement. Invariants that could not survive this round trip were rejected. This paper demonstrates that stateless interaction, when governed by explicit artefacts and boundaries, is not a limitation but a structural advantage.