docs: Inject ClawSec sword-and-shield hero asset

Author: Cevox Solutions

README.md

@@ -1,4 +1,7 @@
 # Claw Security (ClawSec)
+<div align="center">
+  <img src="assets/clawsec-hero.png" alt="ClawSec Hero Logo" width="600" />
+</div>
 
 Claw Security is the premier open-source, autonomous AI penetration testing harness. Written entirely in safe Rust, ClawSec transforms advanced foundation models into active, fully-sanctioned Red Team operators capable of executing enterprise-grade network enumeration, vulnerability scanning, and autonomous exploit chaining.