Design Blueprint: A Gamma-Ray Polarimeter on a Deep-Space Platform Measuring Polarisation Rotation Accumulated Over Cosmological Paths

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24142326): This paper presents a space mission design, computed from stated assumptions and not measured, built to measure one quantity: the polarisation rotation accumulated over a gigaparsec path attributed to a torsion-coupled birefringence, for which the design case adopts 0.9 degrees of rotation. 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.