Link the technical report on arXiv

The report is posted as arXiv:2607.28625, so replace the placeholder
badge and citation identifier and drop the placeholder note.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -126,7 +126,7 @@ extra_gated_button_content: Submit access request
   </p>
   <p>
     <a href="https://ace-data-engine.github.io/ACE-Data-0/"><img src="https://img.shields.io/badge/Blog-ACE--Data--0-0054A6?logo=googlechrome&amp;logoColor=white" alt="Blog"></a>
-    <a href="https://ace-data-engine.github.io/ACE-Data-0/"><img src="https://img.shields.io/badge/Technical_Report-Coming_Soon-6B7280" alt="Technical report coming soon"></a>
+    <a href="https://arxiv.org/abs/2607.28625"><img src="https://img.shields.io/badge/arXiv-2607.28625-B31B1B?logo=arxiv&amp;logoColor=white" alt="Technical report on arXiv"></a>
     <a href="./LICENSE"><img src="https://img.shields.io/badge/License-Research_Only-A33B20" alt="Research-only license"></a>
     <a href="https://ace-data-engine.github.io/ACE-Data-0/"><img src="https://img.shields.io/badge/Data_Files-Coming_Soon-6B7280" alt="Data files coming soon"></a>
   </p>
@@ -276,13 +276,11 @@ redistribution, no re-identification. Read it in full before requesting access.
              Liu, Yinghao and Huang, Yue and Liao, Zhichao and Wang, Yunxiang and
              Liu, Haiheng and Tian, Xingshun and Su, Dawei and Zhuo, Long and
              Tao, Dacheng and Wang, Xiaogang and Pan, Liang and Liu, Ziwei},
-  journal = {arXiv preprint arXiv:2607.00000},
+  journal = {arXiv preprint arXiv:2607.28625},
   year    = {2026}
 }
 ```
 
-The arXiv identifier is a placeholder and will be replaced when the report is posted.
-
 ## Contact
 
 Project updates on the [blog](https://ace-data-engine.github.io/ACE-Data-0/). Questions about