Copper resistance rises with heat. Magnet strength falls with heat. The identity coefficient is resistance divided by the torque constant squared, so a rising numerator and a falling denominator push it the same way, and the two effects compound instead of cancelling. The result is 0.633 percent per degree. Set that against the 21.5 percent that separates two different units and the crossover lands at 34 degrees. A motor passes through 34 degrees between cold start and steady running, every time it is used. So the fingerprint dissolves during ordinary operation, before any adversary is involved, exactly as the arm's power rail was contaminated by its own legs in Module 2. And then the rescue is almost disappointing: measure the winding temperature to within five degrees and the drift falls to three percent. The fix is a thermometer, not a better ammeter.