Add model card.

README.md

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-**Companion artifact for [_GPU Forecasters: Language Models as Selective Surrogates for Kernel Runtime Optimization_](https://arxiv.org/abs/2605.31464)** ([PDF](https://arxiv.org/pdf/2605.31464), [code](https://github.com/codezakh/gpu-surrogates)).
+Companion artifact for [_GPU Forecasters: Language Models as Selective Surrogates for Kernel Runtime Optimization_](https://arxiv.org/abs/2605.31464). Code: [codezakh/gpu-surrogates](https://github.com/codezakh/gpu-surrogates).
 
 LoRA adapter for [`openai/gpt-oss-20b`](https://huggingface.co/openai/gpt-oss-20b)
 fine-tuned with the correctness reward to forecast kernel speedups.