Add weather temperature sensor flag

docs/API.md

@@ -637,4 +637,8 @@ Request:
     {
       "id": "relay_1",
       "state": true
-    }
+    }\n\n### Weather temperature sensor flag
+
+Temperature sensor config entries now include `weather: true`.
+
+When a configured temp sensor has `weather: true`, the WebUI may show it as the outside/weather temperature badge. The `/status` temp objects also include this flag so HTTP, UART, USB serial, and future Pico clients can identify the selected outside-air sensor without guessing from the sensor name.\n

docs/PARITY_MATRIX.md

@@ -105,5 +105,4 @@ Future additions must be implemented on:
     UART JSON
     HTTP API
 
-before parity is considered maintained.
-
+before parity is considered maintained.\n\n- Temperature sensor config/status parity now includes the `weather` boolean flag for outside-air display selection.\n

docs/UART_PROTOCOL.md

@@ -265,4 +265,8 @@ Pico sends:
 
 Alternative:
 
-    {"type":"clear_temp","slot":1}
+    {"type":"clear_temp","slot":1}\n\n### Temperature weather flag
+
+`status_response.config.temperature_sensors[]` and `status_response.temps[]` include `weather: false`.
+
+`config_temp` may include `weather: true` to mark one configured sensor as the outside/weather sensor. Pico clients should treat this as optional and default missing values to `false`.\n

docs/project-state.md

@@ -163,4 +163,4 @@ Examples:
 5. Add config backup/restore.
 6. Improve BMS out-of-range behavior without changing NimBLE connect timeout.
 
-- Fixed WebUI temperature probe scan by registering `/temps/scan`, `/temps/assign`, and `/temps/clear` firmware routes.
+- Fixed WebUI temperature probe scan by registering `/temps/scan`, `/temps/assign`, and `/temps/clear` firmware routes.\n\n- Added per-temperature-sensor `weather` flag and WebUI outside temperature badge with emoji thresholds: below 50°F ice, 50-74°F happy, 75-84°F sun, and 85°F+ fire.\n