Simulation and evaluation

simulate_assay(n=10_000, drift=:linear, drift_start=6000)
evaluate_detector(:cusum; nrep=20)

Drift kinds: :none, :linear, :step, :variance, :lot, :batch, :periodic, :failure, :outliers.

evaluate_detector reports sensitivity, false-positive rate, precision, and detection delay. Custom AbstractDetector types can be evaluated with the same harness.

showcase_dataset() builds the 12-month demonstration: three lots, two instruments, one calibration, gradual drift, variance shift, and control failures.