Design Blueprint: A Fifth-Coordinate Phase Interferometer: Atom-Optical Readout of Extra-Coordinate Displacement with Computed Resolution

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24129538): An interferometer whose arms are arranged to cancel ordinary displacement can retain sensitivity to displacement along a compact fifth coordinate, which appears as a residual phase that common-mode rejection does not remove. 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.