docs: add arXiv 2604.16254 paper citation

README.md

@@ -103,12 +103,20 @@ Real sources are intentionally over-represented (1,800 total) to enable rigorous
 
 ```bibtex
 @article{oh2026artifactnet,
-  title={ArtifactNet: Detecting AI-Generated Music via Forensic Residual Physics},
-  author={Oh, Heewon},
-  year={2026}
+  title        = {ArtifactNet: Detecting AI-Generated Music via Forensic Residual Physics},
+  author       = {Oh, Heewon},
+  journal      = {arXiv preprint arXiv:2604.16254},
+  year         = {2026},
+  eprint       = {2604.16254},
+  archivePrefix= {arXiv},
+  primaryClass = {cs.SD},
+  doi          = {10.48550/arXiv.2604.16254},
+  url          = {https://arxiv.org/abs/2604.16254}
 }
 ```
 
+**arXiv**: [2604.16254](https://arxiv.org/abs/2604.16254) · **DOI**: [10.48550/arXiv.2604.16254](https://doi.org/10.48550/arXiv.2604.16254)
+
 ## License
 
 CC BY-NC 4.0