Mealtime_Magic_Onboarding

First-cycle onboarding skill for a Mealtime Magic instance. Greets a new household steward in plain conversation register, captures the MINIMUM signal needed to draft a week-one dinner plan, fires the first artifact within 10 minutes of steward attention, and writes the household profile artifact. Encodes all 6 archetype inviolables. Defers calendar sync and reminder pings as opt-in only. NEVER runs a multi-round intake-form question wall. Hands off to Mealtime_Magic_Weekly_Plan once the household profile is populated and the first weekly plan exists in draftPending state.