Release v0.4.0 - Project Showcase Generation

Major features:
- AI-powered project showcase generation with Claude
- Automatic extraction of code snippets and README images
- SVG image support for project documentation
- Release version and date tracking for all projects
- Experimental project detection (no releases yet)
- Overall portfolio statistics and metrics
- Code blocks with AUTO syntax highlighting
- Smart caching to avoid redundant AI calls

Use --showcase to generate a comprehensive project portfolio.