Route framework-specific deep work to the guides in this skill: , , , , , . Env vars: modern rules (read first) Env values are injected at build time . Any change (client- or server-side) requires a redeploy — editing a var in the UI/CLI does NOT reach the live site or already-deployed functions until a new build runs. Never use a client prefix for secrets. Client-prefixed vars are inlined into the browser bundle: , , , , , , . Client-embed prefixes by framework: CRA , Gatsby , Next , Nuxt , Vue CLI . Scopes: build-time access needs Builds scope; SSR/DSG runtime access needs both Functions an…