0.11.0

Added

• hasMacOverride(): whether an active MAC override is set
• hasFactoryMac() / setFactoryMac(): the factory MAC can be unknown at
  construction — WiFi on an ESP32-P4, whose station address belongs to the
  ESP-Hosted co-processor. The adapter reports it once the interface is up;
  accepted once, while it is unknown

Changed

• getMac() returns false, with the buffer zero-filled, when the address
  asked for is the factory one and it is not known; toJson() gives "mac":""
  then. Before, an unknown address came back as 00:00:00:00:00:00 and true
• isValidMac() refuses group (multicast) addresses: the I/G bit, bit 0 of
  byte 0, set. This includes the broadcast address it already refused. The
  drivers refuse such an address, so an override that passed would only fail at
  the adapter
• saveCfg() stores the mac key only when an override is set, and removes it
  otherwise — the convention the static-address keys already follow
• The generated default hostname is built from the chip's base MAC on ESP32
  (ESP_MAC_BASE), not from the interface's address. Unchanged for WiFi, where
  the station address is the base. An Ethernet profile on ESP32 gets a new
  default hostname — its address is base+3, or a local one — which now matches
  the WiFi profile's, as the documentation always said it did

Fixed

• WiFiProfile and EthProfile on ESP32 ignored a failed esp_read_mac(). On
  an ESP32-P4, which has no radio of its own, the station address is not in the
  chip's MAC table: the factory MAC came out as all zeros, the default hostname
  as ESP-000000