docs: update scripts citation with DOI metadata

README.md

@@ -69,12 +69,13 @@ github/
 If you use this dataset in research, please cite:
 
 ```bibtex
-@misc{astra-skills-2026,
-  title={Astra Skills Collection: A Large-Scale Dataset of AI Agent Skills},
-  author={Dawei Zhang},
-  year={2026},
-  publisher={Hugging Face},
-  url={https://huggingface.co/datasets/zhangdw/astra-skills-scripts}
+@misc{dawei_zhang_2026,
+  author       = { Dawei Zhang },
+  title        = { astra-skills-scripts (Revision d1a4872) },
+  year         = 2026,
+  url          = { https://huggingface.co/datasets/zhangdw/astra-skills-scripts },
+  doi          = { 10.57967/hf/8400 },
+  publisher    = { Hugging Face }
 }
 ```