docs: citation placeholder pending arXiv release

README.md

@@ -171,9 +171,10 @@ See the code repository for the evaluation harness.
 
 ```bibtex
 @misc{rbac_text2sql_benchmark,
-  title  = {Role-Based Text-to-SQL Benchmark},
-  author = {Fei Yang and others},
-  year   = {2026},
-  url    = {https://github.com/2020dfff/RBAC-Text2SQL-Benchmark}
+  title = {RBAC-Text2SQL Benchmark},
+  note  = {arXiv preprint forthcoming; this entry will be updated with the
+           authors and arXiv identifier once the preprint is released},
+  year  = {2026},
+  url   = {https://github.com/2020dfff/RBAC-Text2SQL-Benchmark}
 }
 ```