Audit-clean C standard across all 5 cb challenges: fix 3 functions over 8 exec lines; rebuild bins; update CB-0x03 and CB-0x05 guides; verify all guides against new bins

0x0014a_cb/include/gpio_ctrl.h

@@ -17,10 +17,39 @@
 #define LED_GREEN_PIN     17
 #define TAMPER_WIRE_PIN   15
 
+/**
+ * @brief Initialize LED and tamper wire GPIO pins.
+ * @param void No parameters.
+ * @return void No return value.
+ */
 void init_gpio(void);
+
+/**
+ * @brief Drive the armed indication LEDs (red on, green off).
+ * @param void No parameters.
+ * @return void No return value.
+ */
 void set_led_armed(void);
+
+/**
+ * @brief Drive the safe indication LEDs (green on, red off).
+ * @param void No parameters.
+ * @return void No return value.
+ */
 void set_led_safe(void);
+
+/**
+ * @brief Drive the tamper flash indication on the red LED.
+ * @param state True to turn the red LED on, false to turn it off.
+ * @return void No return value.
+ */
 void set_led_tamper_flash(bool state);
+
+/**
+ * @brief Read the tamper wire loop state.
+ * @param void No parameters.
+ * @return true when the tamper wire is intact, false when cut.
+ */
 bool is_tamper_wire_intact(void);
 
 #endif /* GPIO_CTRL_H */