When traceability resolution in the electrode R2R section stops at the "roll ID," a 5,000 mm coating defect in one mother roll expands the isolation scope to every cell derived from that mother roll. Assuming a 3,000,000 mm mother roll, 4 lanes, 8 daughter rolls, and 8,000 mm of cathode web per cell, the isolation scope is 1,500 cells at mother-roll-ID resolution, 188 cells at daughter-roll-ID resolution, and 2 cells at encoder-based mm-coordinate resolution (±500 mm), a difference of up to 750 times. This resolution is preserved only when a key consisting of "parent ID + parent coordinate interval + direction bit + transform coefficient" is reissued at every split…