docs: give the release a proper @software entry, credited

The card pointed at a bare repository URL for the weights, which credits nobody and cannot be pasted into a bibliography. A @software entry does not need a DOI — author, title, version and url are enough — and it matches the entry in the GitHub README and CITATION.cff.

README.md

@@ -204,7 +204,18 @@ Cite the **paper** for the method and results:
 }
 ```
 
-For the weights themselves, cite this repository: <https://huggingface.co/paritok/paritok-4b-v1>
+Cite the **software** for this release — the weights, the gateway, and the training and evaluation code:
+
+```bibtex
+@software{paritok-4b-v1,
+  title   = {Paritok-4B-v1: An Open-Source Compression Model for AI Coding Agents},
+  author  = {Shi, Jiayu and Chen, Luzhuo},
+  year    = {2026},
+  version = {4B-v1},
+  license = {Apache-2.0},
+  url     = {https://github.com/Paritok-official/paritok-4b-v1},
+}
+```
 
 ---