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

Rewire_checklist.md

@@ -183,13 +183,14 @@ Then connect the motor side of that driver to:
 
 according to the driver board you are using.
 
-## 14. Wire The WS2812B LEDs
+## 14. Wire The WS2812 LEDs
 
 Connect:
 
-- `Mega D22` -> `WS2812B DIN`
-- `5V LED supply` -> `WS2812B 5V`
-- `WS2812B GND` -> common ground rail
+- `Mega D22` -> main backlight/status strip `DIN`
+- `Mega D36` -> indicator strip `DIN`
+- `5V LED supply` -> both strip `5V` inputs
+- both strip `GND` inputs -> common ground rail
 
 If the LED chain is long or bright: