feat(espnow): add wire transport and simplify broadcast main

Binary espnow_wire/espnow_transport modules plus a minimal main that
broadcasts a JSON hello and polls ESP-NOW while running presets.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/settings.py

@@ -31,11 +31,9 @@ class Settings(dict):
         # Power-on: "default" | "last" | "off"
         self["startup_mode"] = "default"
         self["brightness"] = 32
-        self["transport_type"] = "espnow"
+      
         self["wifi_channel"] = 1
-        # ESP-NOW transport (requires espnow firmware; uses wifi_channel).
-        self["ssid"] = ""
-        self["password"] = ""
+       
 
     def save(self):
         try: