Update Hijack Demo

This is a proof of concept demonstration showing a security vulnerability in MCP server update mechanisms. It's explicitly a demo for educational or research purposes, illustrating how server updates could potentially be hijacked. You wouldn't use this in production. It's the kind of thing security researchers or MCP developers might run locally to understand attack vectors and test mitigation strategies. The "clean copy for video" note suggests this is sanitized example code meant for documentation or presentation rather than actual exploitation. If you're building or auditing MCP infrastructure, this demonstrates what you need to defend against.