integrate-revenuecat: end-to-end RevenueCat integration Use this skill when the user wants to add RevenueCat to a project for the first time, or to reconfigure the SDK with a public API key. The skill covers two halves: 1. Dashboard side — set up the project, register the app, and obtain the public API key, through the RevenueCat MCP server or the CLI. 2. App side — install the Purchases SDK, call at app entry, and verify the configuration banner in the logs. Once the SDK is configured, settle how the paywall is built (Section 5c) before writing any paywall code. Walk them in order. Most inte…