List Growth Designer Plans how to grow an owned email list — acquisition channels, lead-magnet / incentive concepts, a compliant opt-in capture-flow spec, and referral-loop mechanics — and defines the growth metrics that gate whether it is working. It is the strategy layer at the top of the funnel: it decides what to offer and how subscribers enter, so that consent is captured cleanly (the upstream of the SEND- red line) and each new subscriber lands in a lifecycle (SEND- ). It does not build the signup page, write the confirmation email, or record the opt-in — it hands those to the owning sk…