repo: archive legacy pico dashboard

firmware/esp32-s3-dashboard/README.md

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+# ESP32-S3 Dashboard Firmware
+
+This is the placeholder for the current dashboard firmware direction.
+
+## Target hardware
+
+Current dashboard target:
+
+- Waveshare ESP32-S3 touchscreen display
+- WiFi connection to the Cargo ESP32 access point
+- HTTP/REST communication with the Cargo ESP32 API
+- Future LVGL-based dashboard UI
+
+## Responsibilities
+
+The ESP32-S3 dashboard is responsible for:
+
+- Touchscreen UI
+- Vehicle gauges
+- Dashboard rendering
+- Future CAN/OBD-II vehicle visualization
+- Future tilt/roll/off-road screen visualization
+
+## Not responsible for
+
+The ESP32-S3 dashboard does not own:
+
+- Relay authority
+- BMS authority
+- Alarm authority
+- Cargo ESP configuration storage
+- Load-switching hardware control as the source of truth
+
+The Cargo ESP32 remains the power-system controller and source of truth.
+
+## v1 communication path
+
+    Dashboard ESP32-S3
+            <-> WiFi / HTTP REST
+    Cargo ESP32 AP
+
+Not v1 dashboard communication:
+
+- Pico UART
+- ESP-NOW
+- MQTT
+- CAN between controllers