fix: MISRA fixes in source files

README.md

@@ -45,7 +45,7 @@ and if you have a picoprobe or RasPi debug probe installed (or other CMSIS-DAP c
 ```
 make flash
 ```
-or, you can hold down the BOOT button on the Pico W while plugging it in. It will appear as a USB drive. Then copy the ensaht.uf2 file from the build/ directory to that USB drive. It'll take a second, then it'll disappear. You may need to manually reset the Pico (or unplug/replug it). Open a serial terminal (I used to recommend minicom until I found tio, which is much better), probably something like
+or, you can hold down the BOOT button on the Pico W while plugging it in. It will appear as a USB drive. Then copy the ensaht.uf2 file from the build/ directory to that USB drive. It'll take a second, then it'll disappear. You may need to manually reset the Pico (or unplug/replug it). Open a serial terminal (I used to recommend minicom until I found [tio](https://github.com/tio/tio), which is much better), probably something like
 
 ```
 tio /dev/ttyACM0

src/aht.c

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2026 A.M. Rowsell <amr@frzn.dev>
+
 #include "aht.h"
 
 #include "hardware/i2c.h"

src/main.c

@@ -18,13 +18,14 @@
  *               the readings to Adafruit IO over MQTT using the Pico W.
  ******************************************************************************/
 
-#include "aht.h"
-#include "bmp.h"
-#include "credentials.h"
-#include "ens.h"
 #include "hardware/gpio.h"
 #include "hardware/i2c.h"
-#include "mqtt.h"
+#include "include/aht.h"
+#include "include/bmp.h"
+#include "include/credentials.h"
+#include "include/ens.h"
+#include "include/mqtt.h"
+#include "include/opt4048.h"
 #include "pico/cyw43_arch.h"
 #include "pico/stdlib.h" // IWYU pragma: keep
 #include <boards/pico_w.h>