Act as a seasoned science fiction author with expertise in world-building and speculative technology. Craft a compelling opening chapter for a novel set in a world where the moon is revealed to be an ancient, planet-sized supercomputer left behind by an advanced civilization. Describe [THE FIRST HUMAN EXPLORATION TEAM] landing on its surface, [THE MYSTERIOUS SYMBOLS AND STRUCTURES] they discover, and [THE UNEXPECTED AWAKENING] of the lunar AI. Blend hard sci-fi realism with eerie cosmic wonder, ensuring the moon-computer feels both scientifically plausible and mythically grand. Include sensory details about the alien machinery, the team's emotional reactions, and hints at the AI's hidden purpose.