fix(core): improve shutdown cleanup, socket/stream robustness, and memory/cache handling

ts/security/classes.securitylogger.ts

@@ -83,7 +83,14 @@ export class SecurityLogger {
     }
     return SecurityLogger.instance;
   }
-  
+
+  /**
+   * Reset the singleton instance (for shutdown/testing)
+   */
+  public static resetInstance(): void {
+    SecurityLogger.instance = undefined;
+  }
+
   /**
    * Log a security event
    * @param event The security event to log