23d50037888d493a10b9050e5d7adca07a34ea3f
Introduce ENA pins for both motors and implement rpmToPwm and setMotor. Replace extensive Serial debug prints with concise motor‑drive logic in Engine::update. Consolidate sonar pins into a single TRIG_AND_ECHO_PIN. Update pinMode calls in the sketch to configure the new ENA pins.
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