Design Blueprint: An Entangled Optical Clock Node for Fifth-Coordinate Phase Synchronisation

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24138448): This paper presents the design of a clock node that distributes synchronisation by entangled photon pairs rather than by classical pulses, and computes what the design can deliver under stated component assumptions. 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.