Exercises the existing MB machinery in the RT iterator: when imp.mb_en is ON,
per-scene blur vectors from OpticalFlow.getMotionBlur (FD-based rates) send
interCorrPair down the setInterTasksMotionBlur/interCorrTDMotionBlur path -
convert_direct runs twice, the second run subtracting the shifted+scaled copy
via negative TpTask.scale (LWIR bolometer exponential-tail removal). mb_en OFF
keeps the single-run path, giving a one-checkbox A/B. Same getMotionBlur usage
as offline setInitialOrientationsCuas (stored truth was produced WITH MB on).

mvn compile clean (Eyesis closed).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>