Tend the membrane memory corpus — an OKF concept store whose fragment evolution lives in the git log as lineage trailers. Fire when creating, evolving, merging, splitting, or CORRECTING durable memory/knowledge that lives as OKF files under git; when recording how a belief changed or was repudiated; or when tracing a concept's history through time. YOU are the evolver — there is no evolution engine and no LLM sidecar. NOT for transient notes, scratch, or code comments.