Add version flag and welcome message display

[bvdr]

Summary

Add version flag support and improve welcome messages displayed after installation and when running the CLI without arguments.

Features

1. Version Flag Support

• j -v - Display current version number
• j --version - Display current version number

2. Welcome Message Improvements

• Show version number in welcome messages
• Display formatted welcome message after npm install
• Improve first-run user experience

Implementation Details

Files Modified

1. index.js

   • Added version flag handling (-v, --version)
   • Created showWelcomeMessage() function for consistent welcome display
   • Updated help and empty command displays to include version info

2. scripts/postinstall.js

   • Added showWelcome() function with formatted ASCII box
   • Display welcome message at start of postinstall process
   • Improved visual presentation of getting started instructions

Benefits

• Users can quickly check installed version (j -v)
• Better onboarding experience with clear welcome messages
• Consistent messaging across different entry points
• Version visibility without requiring --help flag

Acceptance Criteria

• j -v displays version number only
• j --version displays version number only
• Welcome message shown after npm install
• Welcome message includes version information
• All commands work without errors

Related

Improves user experience and follows CLI best practices for version display.