Smartfunc: Turn Docstrings into LLM-Functions

This is the way LLM-enhanced coding should (and I believe will) go.

Treating the LLM like a compiler is a much more scalable, extensible and composable mental model than treating it like a junior dev.

smartfunc doesn't really treat the LLM as a compiler - it's not generating Python code to fill out the function, it's converting that function into one that calls the LLM every time you call the function passing in its docstring as a prompt.

A version that DID work like a compiler would be super interesting - it could replace the function body with generated Python code on your first call and then reuse that in the future, maybe even caching state on disk rather than in-memory.