Function run_pbt_lite 

pub fn run_pbt_lite(period: u32, noise_amp: f64, seed: u64) -> f64

Runs the PBT-lite continuous-knob tuner over the drift problem; returns its total reward. The knob’s feasible range is [0, 1] and it starts mid-range.

Panics

If the tuner configuration is invalid (it is not).