Just include "esp_wifi.h" and add these three lines at the start of app_main():
ESP_ERROR_CHECK(esp_event_loop_create_default());
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
After that, in the monitor, you should see something like this:
phy_version: 1163.0, 665d56c, Jun 24 2020, 10:00:08, RTOS new
I (410) phy_init: phy ver: 1163_0
Also remember to comment out the adc_read_fast block, since it is not suitable for Vcc mode.