Design Blueprint: A Spin-Memory Quantum Repeater Node Stabilised by a Torsion Phase Reference

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24138649): Long-distance quantum communication fails by loss: a photon's survival probability falls exponentially with fibre length, so direct transmission cannot span continental distances at useful rates. 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.