TypedPython 2: compile @compiled modules through Cython on desktop #23

What

For modules or functions marked @compiled (notation decided in design §8 #1): use the gate's inferred types to emit Cython pure-Python-mode annotations, build a CPython extension for the desktop targets (macOS arm64 first, then Linux/Windows in CI), and import it from the embedded interpreter in place of the .py module. int compiles as i64, promoting to a big integer on overflow (design §8 #2 proposal). Python semantics are unchanged.

Done when

• Each benchmark's compiled output equals its interpreted output.
• nbody and spectral-norm compiled run ≥ 10× faster than CPython, measured alone.
• Every construct that Cython's pure mode rejects is listed (it becomes the requirement list for stage-2 IR).