Generate a K=1 expression control with a planted double-well coordinate
Source:R/13-stage0-synthetic.R
synthetic_k1_double_well_control.RdDraws independent coordinates exactly from the known double-well stationary distribution by rejection sampling, embeds them along one planted feature direction in a single high-dimensional expression matrix, and retains both subspace and potential ground truth. This is a disclosed calibration/development control, never an acceptance artifact (ADR 0016).