Interactive Command-Line Menus // Provides interactive command- line menu functionality with single and multiple selection menus, keyboard navigation (arrow keys or vi-style j/k), preselection, and graceful fallback for non-interactive environments. Inspired by tools such as 'inquirer.js' https://github.com/SBoudrias/Inquirer.js, 'pick' https://github.com/aisk/pick, and 'survey' https://github.com/AlecAivazis/survey. Designed to be lightweight and easy to integrate into 'R' packages and scripts.