Enable host OTA over BLE and harden ESP-NOW slave distribution.

Allow the same staged firmware upload path on BLE as UART, fix distribute stack/event-group crashes, and recover sticky slave OTA sessions instead of failing with err=4.

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

main/cmd/cmd_ota.c

@@ -1,5 +1,4 @@
 #include "cmd_ota.h"
-#include "app_config.h"
 #include "led_ring.h"
 #include "ota_espnow.h"
 #include "ota_uart.h"
@@ -14,6 +13,8 @@ static const char *TAG = "[OTA_CMD]";
 
 #define OTA_PREPARE_STACK 8192
 #define OTA_PREPARE_PRIO 5
+/* Block buffer is static .bss; stack is for nested EspNowMessage + encode buf +
+ * esp_now_send path. 4 KiB overflowed; 8 KiB matches the pre-crash budget. */
 #define OTA_DIST_STACK 8192
 #define OTA_DIST_PRIO 5
 
@@ -104,24 +105,10 @@ static void ota_prepare_task(void *param) {
   vTaskDelete(NULL);
 }
 
-static bool ota_host_is_uart(void) {
-  const app_config_t *cfg = app_config_get();
-  if (cfg != NULL && cfg->host_ble) {
-    ESP_LOGW(TAG, "OTA requires UART host (DIP8=0); BLE host active");
-    return false;
-  }
-  return true;
-}
-
 static void handle_ota_start(const uint8_t *data, size_t len) {
   alox_UartMessage uart_msg;
   alox_OtaStartPayload req = alox_OtaStartPayload_init_zero;
 
-  if (!ota_host_is_uart()) {
-    send_ota_failed(20);
-    return;
-  }
-
   if (uart_cmd_decode(data, len, &uart_msg) != ESP_OK) {
     send_ota_failed( 2);
     return;
@@ -349,10 +336,6 @@ static void ota_start_espnow_task(void *param) {
 }
 
 static void handle_ota_start_espnow(const uint8_t *data, size_t len) {
-  if (!ota_host_is_uart()) {
-    send_ota_failed(20);
-    return;
-  }
   (void)data;
   (void)len;