Update README.md

README.md

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 # Evaluation & Performance
-Detailed evaluation results are reported in out [Tech Report](https://k2think-about.pages.dev/assets/tech-report/K2-Think_Tech-Report.pdf)
+Detailed evaluation results are reported in out [Tech Report](https://arxiv.org/abs/2509.07604)
 
 ## Benchmarks (pass\@1, average over 16 runs)