hmmhmmhm/node-packages ? reverse-engineered prompt

Build me a TypeScript monorepo for a set of small utility libraries, with a clean shared setup and a simple way to work on each package separately.

I want packages for precise big number math, deterministic pseudo shuffle behavior, crypto helpers that work in Node, browsers, and Cloudflare Workers, a spiral grid mapper, a Korean Hangul based base 72 encoder with profanity filtering, a code obfuscator that turns JavaScript into spell like syntax, and a regular expression helper for pulling data out of strings.

Please make it feel polished and ready to publish, with good README pages, examples for each package, and a consistent developer experience. If anything is unclear, look up current docs online if you need to. Also make sure the project structure supports adding more research packages later without turning into a mess.