Design Blueprint: Mail Slot Reach

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24121643): A mail slot through a front door is also a hole through which a hooked wire can be worked toward the inside latch, and on many doors the latch sits within easy reach of the slot. This study models the geometry from stated assumptions: a 700 mm hooked tool, after losses at the flap, the door thickness and its own bends, commands an effective radius of 520 mm from the slot centre, while an internal cover box behind the slot reduces that radius to 180 mm. A latch is taken as vulnerable when its distance from the slot is within the effective radius, and a safety margin of 80 mm is added for the de 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.