Add link processing and threading functionality to thicket CLI
This commit implements a comprehensive link processing and threading system:
- Add thicket.yaml to .gitignore for local configuration
- Implement link extraction command (links_cmd.py) with URL categorization
- Add reference index building (index_cmd.py) for cross-blog threading
- Create info command for detailed entry information
- Add reference_parser.py for link analysis and threading logic
- Enhance CLI with --tsv flag for tab-separated output format
- Update architecture documentation with threading system details
- Expand CLAUDE.md with uv package management instructions
The system now supports email-style threaded views of blog conversations
by tracking cross-references between different blogs and users.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>