TypedPython benchmarks: CPython / Node / Java / Rust baseline #24

What

benchmarks/typedpython/ holds five programs: nbody, spectral-norm, fannkuch, binary-trees, and one dict-heavy workload. Each is written as checked TypedPython and run as interpreted CPython, as @compiled, and against equivalents in Node, Java and Rust on one machine. The targets in design §6 / the performance note: beat V8, numeric loops within 1.5× of Rust, object-heavy code within about 2× of Java.

Done when

A results table has been committed, measured alone (AGENTS.md §8), with the machine and the date. Rerunning it is one command.