Add optional BMA456 accelerometer init on shared I2C bus.

Probe and configure the sensor when present; log and continue boot if
init fails so boards without BMA456 still run normally.

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

main/powerpod.c

@@ -13,6 +13,7 @@
 #include "esp_ota_ops.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/idf_additions.h"
+#include "bosch456.h"
 #include "led_ring.h"
 #include "uart.h"
 #include <stdint.h>
@@ -76,7 +77,8 @@ void app_main(void) {
 
   err = i2c_new_master_bus(&i2c_mst_config, &bus_handle);
   if (err != ESP_OK) {
-    ESP_LOGI(TAG, "I2C Master Could not Init Bus");
+    ESP_LOGI(TAG, "I2C master bus init failed: %s", esp_err_to_name(err));
+    bus_handle = NULL;
   }
 
   i2c_device_config_t dev_cfg = {
@@ -110,6 +112,13 @@ void app_main(void) {
               1; // map network to 0-8, 0 is not a valid network
   }
 
+  if (bus_handle != NULL) {
+    esp_err_t bma_err = init_bma456(bus_handle);
+    if (bma_err != ESP_OK) {
+      ESP_LOGI(TAG, "BMA456 init skipped: %s", esp_err_to_name(bma_err));
+    }
+  }
+
   const esp_partition_t *running = esp_ota_get_running_partition();
 
   app_config.master = (master != 0);