docs: use paper title

README.md

@@ -11,7 +11,7 @@ library_name: sklearn
 pipeline_tag: text-classification
 ---
 
-# R2-Router: LLM Router with Joint Model-Budget Optimization
+# R2-Router: A New Paradigm for LLM Routing with Reasoning
 
 **R2-Router** intelligently routes each query to the optimal (LLM, token budget) pair, jointly optimizing accuracy and inference cost. Ranked **#1** on the [RouterArena](https://routerarena.github.io/) leaderboard.