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live_fire_drills.py gains dpatch: two rows of small serpentine-filled patches on scrap. Row A is CW at feeds that give relative doses from 1.0 to 0.25. Row B is density 100, 80, 60, 45, and 30 percent at F600. The operator matches each row-B patch to the row-A patch of equal depth. That reads the light fraction of a density off the material, next to the prediction of the thermopile. The drill samples sysfs at 25 Hz, as pcurve does, and writes a JSON record to the bench data directory. Bench tool only, on the dev image; no catalog consequence.