Release go/no-go checklist

Description

Run a cross-platform go/no-go launch or release review for products spanning a Next.js web app, Supabase backend, Stripe/RevenueCat payments, and iOS/Android apps — aggregating the security, privacy, payments, store-submission, deployment, migration, observability, and rollback checks from the CodeCraft skills into a phased runbook (T-7 days, T-1, launch day, T+1) with owners and explicit rollback plans. Use whenever the user is preparing a launch, a major release, a store submission plus web deploy, or asks "are we ready to ship?", "what's left before launch?", or wants a release runbook.