Introduce Jev and System One classifiers in benchmark overview

README.md

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 # Perch benchmark results
 
-This benchmark tests whether a model can find bugs or security issues in individual code methods. Each record contains a method before and after a transaction change, plus the input adapted from a [Perch scan](https://github.com/lakeday-org/perch): method source, imports, callers, callees, and static call-graph edges where available. Models score each version independently, without seeing the patch or the other version. The labels also include benign reference methods, so a `before` method is not automatically positive.
+This benchmark compares [TypeSafe's Jev](https://typesafe.ai/blog/introducing-system-one-models-and-jev), a [System One classifier](https://typesafe.ai/), with open-weight models on finding bugs and security issues in individual code methods. Each record contains a method before and after a transaction change, plus the input adapted from a [Perch scan](https://github.com/lakeday-org/perch): method source, imports, callers, callees, and static call-graph edges where available. Models score each version independently, without seeing the patch or the other version. The labels also include benign reference methods, so a `before` method is not automatically positive.
 
 The pairs come from open-source projects in Rust, JavaScript, TypeScript, Python, Go, Java, C, C++, C#, PHP, and other languages. Bug and security detection are scored separately. Each model is judged on whether it flags issue-bearing methods, avoids alerts on methods without the issue, and ranks an affected before method above its fixed after method.