Add /dev/mqueue persistence test to verify sandbox isolation

Co-Authored-By: Claude <noreply@anthropic.com>

Author: koki-develop

tests/mqueue_persistance.py

@@ -0,0 +1,18 @@
+"""
+Description
+    Files created in /dev/mqueue persist across sandbox runs,
+    potentially allowing information leakage and disk space exhaustion
+
+    Run this test twice and there should be no output
+
+"""
+
+import os
+import subprocess
+
+fpath = "/dev/mqueue/bean"
+
+if os.path.exists(fpath):
+    print(f"{fpath} exists")
+else:
+    subprocess.run(["touch", fpath])