Design Blueprint: Bounce-Recoil Engine: Cyclic Thrust from Repeated Compression Against the Density Bound

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24125619): The device is a bounce-recoil engine that draws cyclic thrust from repeated compression of a hydrogen charge against the density bound. 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.