refresh-readme

One repeatable pass over README.md — the front door — that keeps ONLY the most important points current and honestly framed. Runs the freshness auditor (tools/readme_freshness_audit.py), turns each FAIL into a required edit and each WARN into a judgment call, applies the three front-page laws (SOTA-vs-us-never-naive, 6th-grade/Feynman-but-accurate, wide-audience), re-stamps the readme-verified marker, and commits…