Design Blueprint: Sorting Frame Size

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24121750): Hand sorting looks like a furniture problem — how big a frame of pigeonholes to build — and is actually a decision about passes, reach and errors. A sorter can work comfortably with at most a stated 48 compartments within reach. An office sorting for 180 delivery rounds therefore cannot sort in one pass; the computed two-pass plan uses 13 first-pass area groups and 14 compartments in all, at a handling time of 135.0 minutes for 900 items. The second pass is not free: at a stated mis-sort rate of 0.8 percent per pass, two passes raise the expected mis-sort share from 0.8 percent to 1.59 percent 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.