Normalize primary communication around UART

docs/api.md

@@ -4,7 +4,7 @@
 
 The ESP32 acts as the system controller and provides status and control endpoints.
 
-Primary communication is RS-485.
+Primary communication is UART over CAT5. WiFi HTTP API is the backup communication path.
 
 WiFi HTTP API is provided for:
 
@@ -48,7 +48,7 @@ Example:
 
   "network": {
     "wifi_enabled": false,
-    "rs485_connected": true
+    "uart_connected": true
   }
 }
 ```
@@ -167,7 +167,7 @@ Example:
 ```json
 {
   "wifi_enabled": false,
-  "rs485_connected": true,
+  "uart_connected": true,
   "starlink_enabled": false
 }
 ```

docs/architecture.md

@@ -19,7 +19,7 @@ The system provides:
 
 - Raspberry Pi Pico 2 W
 - 3.5" SPI Capacitive Touchscreen
-- RS-485 communications
+- UART-over-CAT5 communications
 - WiFi backup communications
 
 ### Responsibilities
@@ -36,7 +36,7 @@ The system provides:
 ### Hardware
 
 - ESP32 Relay Controller
-- RS-485 Interface
+- UART-over-CAT5 interface
 - House Battery Interface
 - DS18B20 Temperature Sensor Bus
 - Bosch Relay Drivers
@@ -52,7 +52,7 @@ The system provides:
 ## Communications
 
 Primary:
-- RS-485
+- UART over CAT5
 
 Backup:
 - WiFi HTTP API

docs/dashboard-ui.md

@@ -52,14 +52,14 @@ Future:
 ## System Screen
 
 Displays:
-- RS-485 Status
+- UART Status
 - WiFi Status
 - Message Counts
 - Latency
 - Packet Loss
 
 Testing:
-- RS-485 Disconnect
+- UART Disconnect
 - Sensor Fault Simulation
 - Ignition Simulation
 

docs/roadmap.md

@@ -8,7 +8,7 @@ Features:
 - Dashboard UI
 - Alarm System
 - Sensor Simulation
-- RS-485 Simulation
+- UART Communication Simulation
 - Protocol Layer
 
 ## Phase 2 — Pico Dashboard
@@ -26,7 +26,7 @@ Status: Pending
 
 Features:
 - Relay Control
-- RS-485 Communications
+- UART Communications
 - Configuration Storage
 
 ## Phase 4 — DS18B20 Sensors