IKEA Flatpack & Giant-TV-Box into SUV Hatch-Slope 3D Fit Checker

Deterministic 3D oriented bounding-box (OBB) collision test against trapezoidal wheel-arch floor, C/D-pillar rake plane & curved tailgate arc engine (.svg, .pdf, .json) built for IKEA, Tesla Model Y, BMW X5, Volvo XC90 — zero-upload ephemeral Wasm RAM execution.

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