Manage Vercel Flags segments with Vercel CLI

The Vercel CLI introduces a new command for managing segments within Vercel Flags, allowing users to define targeting primitives directly from the terminal. Developers can compose membership using tokens like include and exclude via --add or --remove flags for incremental edits without needing full JSON replacement. All segment commands support output options that enable scriptable workflows in CI pipelines and local environments where agents inspect flag configurations.