branch released 2026-07-10
  * based project: 2026-04-01
    * Introduced a new `app_demo` application framework as a quick-start reference for customers, with a clearer split between configuration, connection management, signal handling, business logic, and CLI layers.
    * Added and stabilized multi-link networking for MQTT, TCP Client, TCP Server, and UDP, including unified routing and reconnect handling.
    * Enhanced MQTT SDK capability:
      * publish now supports QoS and retain
      * added support for multi-topic MQTT subscribe/publish
      * keep-alive is configurable
      * added support for MQTT Last Will messages, including binary payload
      * demo supports mutual TLS configuration
    * Improved signal framework and event reporting:
      * unified WLAN/MQTT/TCP/UDP signal dispatch
      * added structured IPv4 change reporting
      * moved MQTT/TCP/UDP business RX handling into the business task
    * Updated SDK packaging and documentation:
      * unified prebuilt library as `lib/WifiSDK.a`
      * removed legacy `Wifi_lib.a`
      * updated SDK documentation, including a refreshed API Reference Guide and a new Quick Start guide
