IMU-Calibrated Paving, Patio & Trench Drainage Slope % Inspector

Deterministic EXIF accelerometer gravity vector plumb-line calibration + sub-pixel straightedge Hough angle in world horizon frame engine (.heic, .jpg, .dng, .pdf) built for Stabila, ACO Drain, TechnoNICOL, Bosch — zero-upload ephemeral Wasm RAM execution.

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