feat: add infrastructure automation scripts and master improvement plan

scripts/check_banner_raw.py

@@ -0,0 +1,16 @@
+import os
+import sys
+import socket
+
+sys.stdout.reconfigure(encoding="utf-8")
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.settimeout(5.0)
+try:
+    s.connect(("140.44.4.21", 22))
+    banner = s.recv(1024)
+    print(f"RAW BANNER (len={len(banner)}): {repr(banner)}")
+    s.close()
+except Exception as e:
+    print("Error:", e)
+