v0.3.0: Self-upgrade, ASCII banner & demo video

What's New

Features

• Self-upgrade command - Run beeper upgrade to update to the latest version
• Version command - Run beeper version to see build info
• ASCII art banner - Beautiful startup banner when running without arguments
• Demo video - Animated GIF showcasing CLI features with Beeper branding

Fixes

• Fixed search response parsing for wrapped {items: [...]} format
• Fixed search default limit (100 → 20 to match API maximum)

Demo