Design Blueprint: What a Sleeping Bag Rating Actually Buys

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24119650): Sleeping bags carry comfort ratings in degrees, but the physical content of a rating is an insulation resistance, and the insulation a camper must carry grows linearly as the temperature falls. 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.