Make `@next/codemod upgrade` safe to invoke from agents, CI, and other non-interactive environments. Add a `-y, --yes` option that skips interactive questions and accepts their existing defaults, and automatically use the same behavior whenever stdin is not a TTY.

A non-interactive upgrade must complete without waiting for keyboard input. Preserve the current prompt defaults: upgrade rather than remain on React 18, enable Turbopack when the dev script can be updated automatically, leave an unrecognized custom dev script untouched, apply every recommended Next.js codemod and report which ones are being applied to stdout, and run both the React 19 migration and React 19 Types codemods when applicable. Normal TTY-based use without `--yes` must remain interactive.