In a category where trust is still being earned, Apple's new hardware engineering chief has done something rare: he has publicly invited the world to measure his company's work against its promises. The iPhone Duo, Apple's entry into the foldable smartphone market, carries with it years of accumulated consumer skepticism about hinges that weaken and screens that crease — and rather than deflect that skepticism, Apple has chosen to absorb it. This moment is less about a product announcement than about a company staking its reputation on the proposition that engineering transparency, not marketi