README: quote the tagline, add the training-curve loop

README.md

@@ -26,12 +26,20 @@ configs:
 
 # 📈 SmolDataEnvs
 
-**5.5K+ RL tasks for hill-climbing small models in code and data science.**
-
 [![Collection](https://img.shields.io/badge/%F0%9F%A4%97%20Collection-SmolDataEnvs-FFD21E?style=for-the-badge&labelColor=1a1a1a)](https://huggingface.co/collections/FineEnvs/smoldataenvs)
 
 </div>
 
+> **5.5K+ RL tasks for hill-climbing small models in code and data science.**
+
+<div align="center">
+
+<img src="https://huggingface.co/datasets/FineEnvs/SmolDataEnvs/resolve/main/curves.gif" alt="Reward and held-out pass@k climbing over 1,119 GRPO steps" width="100%">
+
+<sub>A 2B model on these tasks: reward, tool efficiency and held-out pass@k over 1,119 GRPO steps.</sub>
+
+</div>
+
 
 Data-analysis tasks as a plain, load-and-go dataset — **no runtime, no framework required**. Each
 row is one self-contained task: a real tabular dataset, a question about it, and a gold answer a