Most "self-updating" AI memory is one sentence in a config file asking the model nicely to remember. That is not a system, and it is why your context library goes stale by month three. You have watched it happen. I spent the last month testing the two best memory builds out there. Garry Tan's GBrain captures everything you say to an always-on phone agent and consolidates it overnight. Andrej Karpathy's Second Brain compiles a curated folder of sources into an interlinked wiki you query against…