docs: surface the contributor wall in the Contributing section

The auto-generated avatar wall sat below Star History inside a collapsed
<details>, so nobody saw who contributed. It now has its own Contributors
subsection right under the contributor guide link. The refresh workflow
keys off the contributors:start/end markers, so its weekly regeneration
is unaffected.

Author: us

README.md

@@ -195,34 +195,35 @@ make check-fast
 
 [Read the contributor guide →](CONTRIBUTING.md)
 
-Engine and MCP server: [AGPL-3.0](LICENSE). Python and TypeScript SDKs: MIT.
-Embedding license: hello@fastcrw.com.
-
-## Star History
-
-<a href="https://www.star-history.com/?repos=us%2Fcrw&type=date&legend=top-left">
- <picture>
-   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/chart?repos=us/crw&type=date&theme=dark&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
-   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/chart?repos=us/crw&type=date&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
-   <img alt="Star History Chart" src="https://api.star-history.com/chart?repos=us/crw&type=date&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
- </picture>
-</a>
+### Contributors
 
-<details>
-<summary>Contributors</summary>
+crw is better because of these people. Thank you, all of you:
 
 <!-- contributors:start -->
 <p align="center">
   <a href="https://github.com/us" title="us"><img src="https://github.com/us.png?size=96" width="48" height="48" alt="us"/></a>
+  <a href="https://github.com/paoloantinori" title="paoloantinori"><img src="https://github.com/paoloantinori.png?size=96" width="48" height="48" alt="paoloantinori"/></a>
+  <a href="https://github.com/rqi14" title="rqi14"><img src="https://github.com/rqi14.png?size=96" width="48" height="48" alt="rqi14"/></a>
   <a href="https://github.com/santhreal" title="santhreal"><img src="https://github.com/santhreal.png?size=96" width="48" height="48" alt="santhreal"/></a>
   <a href="https://github.com/AsheTheWings" title="AsheTheWings"><img src="https://github.com/AsheTheWings.png?size=96" width="48" height="48" alt="AsheTheWings"/></a>
   <a href="https://github.com/adambenhassen" title="adambenhassen"><img src="https://github.com/adambenhassen.png?size=96" width="48" height="48" alt="adambenhassen"/></a>
-  <a href="https://github.com/paoloantinori" title="paoloantinori"><img src="https://github.com/paoloantinori.png?size=96" width="48" height="48" alt="paoloantinori"/></a>
+  <a href="https://github.com/atirna" title="atirna"><img src="https://github.com/atirna.png?size=96" width="48" height="48" alt="atirna"/></a>
   <a href="https://github.com/VIVAAN-DHAWAN" title="VIVAAN-DHAWAN"><img src="https://github.com/VIVAAN-DHAWAN.png?size=96" width="48" height="48" alt="VIVAAN-DHAWAN"/></a>
   <a href="https://github.com/mj520" title="mj520"><img src="https://github.com/mj520.png?size=96" width="48" height="48" alt="mj520"/></a>
 </p>
 <!-- contributors:end -->
 
-</details>
+Engine and MCP server: [AGPL-3.0](LICENSE). Python and TypeScript SDKs: MIT.
+Embedding license: hello@fastcrw.com.
+
+## Star History
+
+<a href="https://www.star-history.com/?repos=us%2Fcrw&type=date&legend=top-left">
+ <picture>
+   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/chart?repos=us/crw&type=date&theme=dark&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
+   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/chart?repos=us/crw&type=date&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
+   <img alt="Star History Chart" src="https://api.star-history.com/chart?repos=us/crw&type=date&legend=top-left&sealed_token=Pe6pRWL7lqTM-St9eo-Cmpk5kYNyuyun0krw9eVZQFIrm3g_R2h46IW6wfNalPXquMsWSNCgKqiar1YVo9MGy2IZmN5Lz6rjZcjBCw6bCcRHORKORFRi9A" />
+ </picture>
+</a>
 
 <sub>Please respect website policies. Crawl and map follow `robots.txt` by default.</sub>