doorbell: fake zigbee probe device + E2E validation (no real ring)

infra/compose.yaml

@@ -106,11 +106,29 @@ services:
       MQTT_HOST: 192.168.81.147
       MQTT_PORT: "1883"
       PLUG_TOPIC: "zigbee2mqtt/Squiggle/set"
+      PROBE_PLUG_TOPIC: "zigbee2mqtt/DoorbellProbe/set"
       POLL_INTERVAL: "5"
       MAX_AGE_SECONDS: "180"
       FLASH_INTERVAL_SECONDS: "1"
       FLASH_DURATION_SECONDS: "7"
       TZ: America/Los_Angeles
 
+  # Fake Zigbee smart-plug used by the doorbell E2E probe. Echoes TOGGLE
+  # commands back on its state topic so the chain can be validated without
+  # flashing a real lamp. No production traffic is routed here.
+  doorbell-probe:
+    build: ./doorbell-probe
+    container_name: doorbell-probe
+    restart: unless-stopped
+    network_mode: host
+    depends_on:
+      mosquitto:
+        condition: service_healthy
+    environment:
+      MQTT_HOST: 192.168.81.147
+      MQTT_PORT: "1883"
+      SET_TOPIC: "zigbee2mqtt/DoorbellProbe/set"
+      STATE_TOPIC: "zigbee2mqtt/DoorbellProbe"
+
 volumes:
   librespot_cache: