Staircase Stringer, Subfloor Drop-Cut & Ergonomic Blondel Riser .DXF Compiler

Deterministic Blondel comfort constraint 600 ≤ 2R + G ≤ 650 mm, exact floor-to-floor riser equalization & first/top stringer heel floor-buildup subtraction engine (.dxf, .pdf, .svg) built for Swanson, Festool, Mafell, ShopBot — zero-upload ephemeral Wasm RAM execution.

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