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

Stripboard_layout.md

@@ -205,9 +205,10 @@ If `D8` and `D9` come from separate fly wires to the stripboard, keep them in th
 
 Route:
 
-- `D22` -> `WS2812 DIN`
-- `5V` -> `WS2812 5V`
-- `GND` -> `WS2812 GND`
+- `D22` -> main backlight/status strip `DIN`
+- `D36` -> indicator strip `DIN`
+- `5V` -> both strip `5V` inputs
+- `GND` -> both strip `GND` inputs
 
 Keep the LED connector in the low-voltage area.