Task-Chair Gas-Cylinder Stroke, Desk-Height Ergonomics & Parquet Caster Guard

Deterministic ISO 9241-5 anthropometric limb-segment chain (popliteal + elbow rest height) + cylindrical roller Hertzian contact pressure vs Janka wood hardness engine (.pdf, .svg, .json) built for Herman Miller, Steelcase, Haworth, Secretlab — zero-upload ephemeral Wasm RAM execution.

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