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/ble_stream.c

@@ -6,6 +6,7 @@
 #include "esp_timer.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "ota_session.h"
 #include "pb_encode.h"
 #include "uart.h"
 #include "uart_cmd.h"
@@ -146,7 +147,9 @@ static void ble_stream_task(void *param) {
       period = BLE_STREAM_PERIOD_MAX_MS;
     }
 
-    if (ble_host_ready() && any_accel_stream()) {
+    /* Pause ticks during host OTA / ESP-NOW distribute so ATT bandwidth
+     * stays available for OTA_STATUS notifies. */
+    if (ble_host_ready() && any_accel_stream() && !ota_session_busy()) {
       alox_UartMessage msg = alox_UartMessage_init_zero;
       uart_cmd_init_response(&msg, alox_MessageType_BLE_STREAM_TICK,
                              alox_UartMessage_ble_stream_tick_tag);