A benchmark de-noising skill for AI agent to optimize cpython

I was using Astra to work on optimizing CPython when the JIT is not enabled. I found several small improvements, and I plan to submit PRs for them. Throughout the optimization work, the instability of pyperformance was a major obstacle. Even when a change is completely unrelated to the affected code, simply causing a particular function to cross some boundary can result in a significant performance regression in one of the benchmarks. Codex found that even whether .pyc files were cleaned befor...