Update docs and firmware for ESPHome bridge migration

- Replace gauge.py (MicroPython) references with gaugecontroller.yaml (ESPHome)
- Update CLAUDE.md and README.md to document ESPHome-native API integration
- Update LED wiring docs for separate main/indicator strips (D22/D36)
- Refactor Arduino firmware to drive two WS2812 strips independently
- Add per-gauge physical offset caching for main and indicator LEDs
- Frame-limit breathe effect (16ms) to reduce unnecessary strip refreshes

archive/config.example.json

@@ -0,0 +1,59 @@
+{
+  "debug": false,
+
+  "wifi_ssid": "MyNetwork",
+  "wifi_password": "MyPassword",
+
+  "mqtt_broker": "192.168.1.10",
+  "mqtt_port": 1883,
+  "mqtt_user": "mqtt_user",
+  "mqtt_password": "mqtt_password",
+  "mqtt_client_id": "gauge_controller",
+  "mqtt_prefix": "gauges",
+
+  "heartbeat_ms": 10000,
+  "rezero_interval_ms": 3600000,
+
+  "device": {
+    "name": "Selsyn Multi",
+    "model": "Chernobyl Selsyn-inspired gauge",
+    "manufacturer": "AdeBaumann",
+    "area": "Control Panels"
+  },
+
+  "arduino_uart": 1,
+  "arduino_tx_pin": 17,
+  "arduino_rx_pin": 16,
+  "arduino_baud": 115200,
+
+  "gauges": [
+    {
+      "name": "Gauge 1",
+      "entity_name": "Selsyn 1 Power",
+      "min": 0,
+      "max": 7300,
+      "max_steps": 4000,
+      "speed": 5000,
+      "acceleration": 6000,
+      "unit": "W",
+      "leds": {
+        "ws2812_red":   [255, 0, 0],
+        "ws2812_green": [0, 255, 0]
+      }
+    },
+    {
+      "name": "Gauge 2",
+      "entity_name": "Selsyn 2 Power",
+      "min": 0,
+      "max": 7300,
+      "max_steps": 4000,
+      "speed": 5000,
+      "acceleration": 6000,
+      "unit": "W",
+      "leds": {
+        "ws2812_red":   [255, 0, 0],
+        "ws2812_green": [0, 255, 0]
+      }
+    }
+  ]
+}