Add command queue dispatcher and VERSION UART handler.

Centralize command dispatch over a FreeRTOS queue so UART and future
ESP-NOW transports can register handlers; implement the protobuf VERSION
command with framed nanopb responses including build git hash.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/powerpod.c

@@ -1,4 +1,6 @@
 #include "powerpod.h"
+#include "cmd_handler.h"
+#include "cmd_version.h"
 #include "driver/gpio.h"
 #include "driver/i2c_master.h"
 #include "driver/i2c_types.h"
@@ -7,9 +9,11 @@
 #include "esp_log.h"
 #include "esp_ota_ops.h"
 #include "freertos/FreeRTOS.h"
+#include "freertos/idf_additions.h"
 #include "led_ring.h"
 #include "nvs.h"
 #include "nvs_flash.h"
+#include "uart.h"
 #include <stdint.h>
 
 enum MASTER_STATES {
@@ -47,6 +51,8 @@ static i2c_master_dev_handle_t io_expander;
 
 static struct app_config_t App_Config;
 
+static QueueHandle_t cmd_queue;
+
 uint8_t reverse_high_nibble_lut(uint8_t n) {
   static const uint8_t lookup[] = {0x0, 0x8, 0x4, 0xC, 0x2, 0xA, 0x6, 0xE,
                                    0x1, 0x9, 0x5, 0xD, 0x3, 0xB, 0x7, 0xF};
@@ -123,15 +129,18 @@ void app_main(void) {
 
   led_ring_init();
 
+  cmd_queue = xQueueCreate(10, sizeof(generic_msg_t));
+  init_cmdHandler(cmd_queue);
+  init_uart(cmd_queue);
+  cmd_version_register();
+
   uint8_t current_digit = 10;
   while (1) {
-    led_command_t cmd = {
-        .mode = LED_CMD_SET_DIGIT,
-        .value = current_digit,
-        .r = 5,
-        .g = 5,
-        .b = 0
-    };
+    led_command_t cmd = {.mode = LED_CMD_SET_DIGIT,
+                         .value = current_digit,
+                         .r = 5,
+                         .g = 5,
+                         .b = 0};
 
     led_ring_send_command(&cmd);
     current_digit = (current_digit + 1) % 11;