A durable SI twin begins before a prompt, a script or a product screen. It begins with a person deciding what may be carried forward and what must stay private.
That boundary changes the work. We can shape a voice, a set of examples and a useful rhythm, while keeping consent visible in every handoff. Human review stays close to promises, pricing and partnerships.
The first version should therefore feel small and honest: one mentor, one audience and a clear way to pause. Scale comes from a reusable configuration model, not from hiding the person behind it.