Design Blueprint: Fifth-Coordinate Timing Beacon: Clock Synchronisation Across a Transit Link and Its Error Budget

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24123454): The device is a timing beacon pair, one at each end of an Earth-Moon baseline, exchanging pulses through a fifth-coordinate transit path and disciplining two atomic clocks to a common epoch. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.