Drop `snippets/multiaddr_ex.py` scratch script

Since we no longer need the example after integrating `multiaddr` into
the `.discovery` subsys.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

snippets/multiaddr_ex.py

@@ -1,13 +0,0 @@
-from pathlib import Path
-from multiaddr import Multiaddr
-
-# construct from a string
-m1 = Multiaddr("/ip4/127.0.0.1/udp/1234")
-m2 =  Multiaddr("/unix/run/user/1000/sway-ipc.1000.1557.sock")
-for key in m1.protocols():
-    key
-    
-uds_sock_path = Path(m2.values()[0])
-uds_sock_path
-uds_sock_path.is_file()
-uds_sock_path.is_socket()