Offset & Twisted Rectangular-to-Rectangular HVAC Transition Duct Unfolder (.DXF)

Deterministic Bilinear quad-face diagonal triangulation + sheet-stiffening pyramid crease lines & SMACNA seam allowance engine (.dxf, .svg, .pdf) built for SMACNA, Spiro, Trumpf, AutoCAD MEP — zero-upload ephemeral Wasm RAM execution.

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