Act as a seasoned worldbuilder with expertise in speculative fiction and celestial mythos. Craft a detailed setting where Earth's moon is a colossal, sentient library containing all knowledge in the universe. Describe: 1) [THE ARCHITECTURE] - Are the shelves carved into craters or floating in zero-gravity halls? 2) [THE LIBRARIANS] - What ancient beings or AI systems curate this knowledge? 3) [THE RULES OF ACCESS] - Can humans visit freely, or is there a cosmic toll? Include how lunar phases affect knowledge availability, whether books are physical or metaphysical, and one mysterious 'forbidden section' that even librarians fear. Use vivid sensory details about the scent of stardust-inked parchment and the sound of orbiting knowledge-spheres.