Set CONFIG_BT_ENABLED + re-add double-init patch

Without CONFIG_BT_ENABLED in sdkconfig.h, NimBLEDevice.cpp lines
are excluded by #if defined(CONFIG_BT_ENABLED) preprocessor guard,
making NimBLEDevice::init() a no-op. No BT controller init ever
occurs -> no RF calibration -> invisible BLE advertising.

With CONFIG_BT_ENABLED: Arduino framework pre-inits BT controller,
then NimBLEDevice::init() double-inits -> ESP_ERROR_CHECK abort.
Fix: patch NimBLEDevice.cpp to check return code and skip init if
already running.

pre_build.py

@@ -70,6 +70,7 @@ def patch_sdkconfig_bt():
         content = f.read()
 
     defines = {
+        "CONFIG_BT_ENABLED": 1,
         "CONFIG_BTDM_CTRL_MODE_BLE_ONLY": 1,
         "CONFIG_BT_NIMBLE_MAX_CONNECTIONS": 1,
         "CONFIG_BT_NIMBLE_TASK_STACK_SIZE": 6144,
@@ -158,6 +159,54 @@ def patch_nimconfig():
     print("nimconfig.h patched successfully")
 
 
+def patch_nimble_device():
+    search_dirs = [
+        os.path.join(os.getcwd(), ".pio", "libdeps"),
+        os.path.expanduser("~/.platformio/lib"),
+    ]
+    dev_path = None
+    for base in search_dirs:
+        if not os.path.exists(base):
+            continue
+        for root, _dirs, files in os.walk(base):
+            if "NimBLEDevice.cpp" in files:
+                dev_path = os.path.join(root, "NimBLEDevice.cpp")
+                break
+        if dev_path:
+            break
+
+    if not dev_path:
+        print("WARNING: NimBLEDevice.cpp not found, skipping controller init patch")
+        return
+
+    print(f"Patching {dev_path} to handle double BT controller init")
+
+    with open(dev_path, 'r') as f:
+        content = f.read()
+
+    # v1.4.3 code has ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));
+    old_block = (
+        'ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));\n'
+        '        ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));\n'
+        '        ESP_ERROR_CHECK(esp_nimble_hci_init());'
+    )
+    new_block = (
+        'if (esp_bt_controller_init(&bt_cfg) == ESP_OK) {\n'
+        '            ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));\n'
+        '        }\n'
+        '        ESP_ERROR_CHECK(esp_nimble_hci_init());'
+    )
+
+    if old_block in content:
+        content = content.replace(old_block, new_block)
+        with open(dev_path, 'w') as f:
+            f.write(content)
+        print("  Patched esp_bt_controller_init to skip if already initialized")
+    else:
+        print("  WARNING: Could not find init pattern in NimBLEDevice.cpp (may already be patched)")
+
+
 patch_usb_ids()
 patch_sdkconfig_bt()
-patch_nimconfig()
+patch_nimconfig()
+patch_nimble_device()