chore: scope npm package as @cogsec/agent-shield

npm blocked 'agent-shield' as too similar to existing 'agentshield'.
Using scoped package under @COGSEC org.

Author: affaan-m

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "agent-shield",
+  "name": "@cogsec/agent-shield",
   "version": "1.0.0",
   "description": "Security auditor for AI agent configurations. Scans Claude Code setups for vulnerabilities, misconfigs, and injection risks.",
   "type": "module",