Architectural Skylight Shaft & Tubular Light-Well Efficiency (WI) Optical Analyzer

Deterministic Shaft aperture-to-ceiling homography for Well Index WI = h·(w+l)/(2·w·l) + radiometric wall-luminance decay cavity integral engine (.jpg, .heic, .dng, .pdf) built for VELUX Sun Tunnel, Solatube, Fakro, IESNA Lighting — zero-upload ephemeral Wasm RAM execution.