Improve model card: add library_name and paper link

Hi! I'm Niels from the community team at Hugging Face.

This PR improves the model card for ME-DLM by:
- Adding the `library_name: transformers` metadata tag to enable the "Use in Transformers" button and better categorization.
- Updating the link to the associated paper page ([Edit-Based Refinement for Parallel Masked Diffusion Language Models](https://huggingface.co/papers/2605.09603)) for better visibility on the hub.

README.md

@@ -1,14 +1,16 @@
 ---
-language:
-- en
 base_model:
 - GSAI-ML/LLaDA-8B-Base
+language:
+- en
 pipeline_tag: text-generation
+library_name: transformers
 ---
+
 ## Edit-Based Refinement for Parallel Masked Diffusion Language Models
 
 <p align="center">
-    <a href="https://arxiv.org/abs/2605.09603">📄 Paper</a> •
+    <a href="https://huggingface.co/papers/2605.09603">📄 Paper</a> •
     <a href="https://github.com/renhouxing/ME-DLM">🏠 Repo</a> •
     <a href="https://huggingface.co/renhouxing/ME-DLM-Stage3">🤖 Models</a>
 </p>