feat(devices): wifi tcp registry, device API/UI, tests; bump led-tool

Made-with: Cursor

tests/tcp_test_server.py

@@ -4,9 +4,14 @@ Simple TCP test server for led-controller.
 
 Listens on the same TCP port used by led-driver WiFi transport and
 every 5 seconds sends a newline-delimited JSON message with v="1".
+
+Clients talking to the real Pi registry should send a first line JSON object
+that includes device_name and mac (12 hex) so the controller can register
+the device by MAC.
 """
 
 import asyncio
+import contextlib
 import json
 import os
 import sys
@@ -204,8 +209,6 @@ async def main():
 
 
 if __name__ == "__main__":
-    import contextlib
-
     try:
         asyncio.run(main())
     except KeyboardInterrupt: