The "where does this memory live" question is the one that decides everything downstream. I hit the personal-scale version of it with a local document tool: the moment the honest answer is "on someone else's server", half the documents you actually need help with are off the table. Your $52/month in your own AWS account is the team-scale version of the same answer. Curious about the off-switch: when you revoke one person's access on a Friday afternoon, does their stored context stay readable by the team, or is it scoped per user?