📝 Add USPD Incident

Signed-off-by: pcaversaccio <pascal.caversaccio@hotmail.ch>

Author: pcaversaccio

ACTIVITY.md

@@ -2,6 +2,7 @@
 
 This is a continually evolving, albeit incomplete, public record of incidents in which SEAL 911 has played a pivotal role in their resolution.
 
+- [USPD incident resolution](https://uspd.io/blog/anatomy-of-a-hack)
 - [Yearn incident resolution](https://github.com/yearn/yearn-security/blob/master/disclosures/2025-12-01.md)
 - [Layerswap incident resolution](https://x.com/layerswap/status/1991810671600673036)
 - [Balancer white hat rescue](https://x.com/Balancer/status/1988685056982835470)