[WIP] add SWE-bench Lite accuracy eval

[adibarra]

[WIP]

lm-eval cannot score SWE-bench, so this reuses lm-eval for patch generation and adds a scoring step that runs the official swebench harness, emitting an lm-eval-shaped results JSON so the existing collect/validate pipeline works unchanged.

[github-actions]

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感谢你的贡献！对于 vLLM 与 SGLang，请确保你的 recipe 与官方 vLLM recipes 和/或 SGLang cookbook 保持一致

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• https://recipes.vllm.ai/

如果不一致，请先创建一个 PR，之后我们才能将你的单节点 PR 合并到 master 分支。让我们确保文档保持一流水准，使整个 ML 社区都能从你的辛勤工作中受益！谢谢

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