Function execute_with_suspend 

pub fn execute_with_suspend(t: &FlashTimings, plan: &[TimedCmd]) -> Vec<u64>

Tier B — an executor that lets a read PREEMPT an in-progress erase on its die, paying a bounded suspend_window instead of the full tBERS, then resuming the erase. Returns each read’s completion cycle; every read stays within FlashTimings::read_latency_bound.