Card: cite the arXiv paper (2610.06778)

README.md

@@ -172,10 +172,13 @@ outlines were generated with Google Gemini models.
 
 ```bibtex
 @article{idealens2026,
-  title   = {IdeaLens: Detecting AI Ideas in Long-form Writing},
-  author  = {Anonymous},
-  journal = {arXiv preprint arXiv:TBD},
-  year    = {2026},
-  url     = {https://arxiv.org/abs/TBD}
+  title         = {IdeaLens: Detecting AI Ideas in Long-form Writing},
+  author        = {Rajendhran, Rishanth and Choi, Minjoon and Russell, Jenna and Namuduri, Ramya and B{\"o}l{\"o}ni-Turgut, Deniz and Karpinska, Marzena and Wieting, John and Iyyer, Mohit},
+  journal       = {arXiv preprint arXiv:2610.06778},
+  year          = {2026},
+  eprint        = {2610.06778},
+  archivePrefix = {arXiv},
+  primaryClass  = {cs.CL},
+  url           = {https://arxiv.org/abs/2610.06778}
 }
 ```