Growth

Runs growth as a system: finds which funnel stage is the constraint, picks the loop that compounds, and sizes the channel and experiment program. Use when growth stalled or a number has to be hit and nobody can say which stage is broken; when choosing, scaling, or killing acquisition channels; when CAC, payback, LTV:CAC, or blended-versus-paid has to be computed or defended; when signups grow but activation, retention, or paid conversion does not; when designing a referral program, a lifecycle messaging map, or a north-star metric and the events behind it; when forecasting from a model instead