Add arXiv paper link (2609.39045)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -98,6 +98,5 @@ and `window.EVO_NO_SWITCH = true` hides the v1–v4 switcher.
   round 30 use the same scorer, judge and demo scripts, so the two sides are comparable.
 - The gallery holds 181 of the 280 runs. The 99 skipped ones are skipped on purpose: the champion is
   round 0 (41), base and champion share no replayable demo (39), no og record (14), not scored yet (5).
-- Authors, paper/code/dataset links and the BibTeX entry are still placeholders in `index.html`.
 - Videos never autoplay more than a handful at a time: cards hold a poster until they scroll into
   view, at most 12 clips play at once, and the hero is one pre-composited video rather than 30.

index.html

@@ -42,7 +42,7 @@
     <div class="hero-cta">
       <a class="btn btn-primary" href="#compare">Watch games evolve</a>
       <a class="btn" href="#demo">Video <small>78&nbsp;s</small></a>
-      <a class="btn" href="#" aria-disabled="true">Paper <small>soon</small></a>
+      <a class="btn" href="https://arxiv.org/abs/2609.39045" target="_blank" rel="noopener">Paper <small>arXiv</small></a>
       <a class="btn" href="https://github.com/WenyiWU0111/RSIGame/tree/main" target="_blank" rel="noopener">Code <small>GitHub</small></a>
       <a class="btn" href="https://huggingface.co/RSIGame" target="_blank" rel="noopener">Datasets <small>on 🤗</small></a>
     </div>
@@ -273,7 +273,10 @@ const PLAY_GAMES = [
             Salvi, Aayush and Lin, Yiheng and Zhang, Ce and Lan, Xiaohan and Zhu, Jiahui and
             Zhong, Yujie and She, Qi and Huang, Biwei},
   year   = {2026},
-  url    = {https://github.com/WenyiWU0111/RSIGame}
+  eprint = {2609.39045},
+  archivePrefix = {arXiv},
+  primaryClass  = {cs.CL},
+  url    = {https://arxiv.org/abs/2609.39045}
 }</code></pre>
   </div>
 </section>