Custom Staircase Blondel Stride-Comfort & Slab Headroom Optimizer

Deterministic Blondel ergonomic stride invariant (610 <= 2R + G <= 640 mm, R - G = 120 mm comfort) + vertical clearance envelope along pitch line engine (.dxf, .svg, .pdf, .json) built for Mobirolo, Fontanot, Graphisoft, Rintal — zero-upload ephemeral Wasm RAM execution.

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