Apple Inc. is accelerating development of three new wearable devices as part of a shift toward artificial intelligence-powered hardware, a category also being pursued by OpenAI and Meta Platforms Inc.The company is ramping up work on smart glasses, a pendant that can be pinned to a shirt or worn as a necklace, and AirPods with expanded AI capabilities, according to people with knowledge of the plans. All three devices are being built around the Siri digital assistant, which will rely on visual c...