Fetch as Markdown

# Rules - Keep It Simple Stupid - Use `uv` for everything, deps and running - Keep it as a single file - Make it easy to understand for humans - Don't add unnecessary dependencies - Respect websites and their terms of service - Handle web requests gracefully with proper error handling - Convert HTML to clean, readable markdown - Focus on extracting the main content, not navigation/ads/sidebars - Use minimal context - strip unnecessary elements to reduce token usage - Provide proper user-agent headers to identify the tool - Implement reasonable rate limiting and timeouts - Handle redirects appropriately - Support common web page encodings