Update citation to published arXiv paper (arXiv:2602.07670)

README.md

@@ -137,12 +137,16 @@ Write an optimized CUDA kernel that computes the same result.
 
 ## Citation
 
+If you use this model, please cite [our paper](http://arxiv.org/abs/2602.07670):
+
 ```bibtex
-@article{barnes2026ttt,
-  title={When Does Test-Time Training Saturate? Evidence from Verifiable Execution-Grounded Tasks},
+@article{barnes2026surprisal,
+  title={Surprisal-Guided Selection: Compute-Optimal Test-Time Strategies
+         for Execution-Grounded Code Generation},
   author={Barnes, Jarrod},
-  journal={arXiv preprint},
-  year={2026}
+  journal={arXiv preprint arXiv:2602.07670},
+  year={2026},
+  url={http://arxiv.org/abs/2602.07670}
 }
 ```