feat: add an optional Node.js CLI splash banner #66788

What is the problem this feature will solve?

Node.js currently starts with no visual acknowledgement when invoked without a script. Developers who use Node.js interactively or in terminal demos have no built-in, opt-in way to display the runtime version and a compact Node.js identity banner.

What is the feature you are proposing to solve the problem?

Add an opt-in CLI flag, such as node --splash, that writes a compact ANSI splash banner to stdout before entering the REPL. The banner would include a Node.js wordmark, process.version, and a short tagline. It should only emit color when the output is a TTY and color is enabled, honor existing color controls such as NO_COLOR/FORCE_COLOR, avoid output when Node.js executes a script or receives piped input, and add no startup overhead unless explicitly requested.

What alternatives have you considered?

A userland script can print a banner (for example, node ~/splash.js), but it requires a separate command and cannot integrate with Node.js CLI color, TTY, and REPL behavior. Shell aliases and third-party REPL wrappers have the same limitation. Keeping the behavior behind an explicit flag avoids changing established CLI output.