//! Dimmable light — single PWM channel, no colour control.
//!
//! Wiring: any LED load on GPIO_DIM with appropriate driver circuit.
//!
//! Adjust the GPIO number to match your hardware.
//! `.mac()` is optional; omit it to let the ESP32 use its built-in MAC.
//! `.reset_pin()` enables factory reset: hold the pin low at boot to unpair.
//!
//! Reference code, not standalone firmware — see `examples/README.md`.