This PR adds a new MathArena evaluation result so it can be indexed on the model leaderboard page.
Model: Qwen/Qwen3.5-9B
Competition dataset id: MathArena/aime_2026
Score: 92.50
Result file: .eval_results/MathArena--aime_2026.yaml
The results are the same as the ones displayed on [our webpage](https://matharena.ai/?view=problem&comp=aime--aime_2026).
Note: this is an experimental feature, we are currently trying to make this work as smooth as possible.
