Formally verified polygon intersection – Opus 4.8 oneshots, prev failed

This repo documents what may be the first formally verified implementation of a polygon intersection algorithm, and the interesting part is not the algorithm — it is the process log. Earlier model versions could not complete the formal proof in one pass; a recent frontier model release managed to oneshot it. That is a meaningful capability jump for anyone using AI assistance on mathematically rigorous code, formal methods, or theorem proving tasks. For most SaaS builders, the direct utility is low: polygon intersection verification is not a Tuesday afternoon problem. But if the team is working on computational geometry, game engine collision detection, or any domain where correctness proofs matter, this is evidence that AI-assisted formal verification is moving from theoretical to practical. The repo itself is narrow and research-flavored rather than a plug-in library. Read the README for the capability benchmark; the code is for specialists. -> Best for: ML researcher or AI engineer working on formal verification or high-assurance geometric algorithms.