Design Blueprint: Density-Capped Confinement Vessel: Sizing a Magnetic Bottle Whose Operating Point Sits Below the Aldred Density by Construction

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24123333): The device is a toroidal magnetic confinement vessel, scanned over minor radius, operating a deuterium-tritium plasma at fifteen kiloelectronvolts and a stated density of ten to the twentieth particles per cubic metre. 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.