Spiral Staircase Center-Column Wrap & Self-Indexing Keyed Tread Compiler (.DXF)

Deterministic Helical walkline pitch at R_walk = 2/3*R_out + headroom clearance z(theta+2*pi) - z(theta) & cylindrical wrap projection engine (.dxf, .pdf, .step) built for Fontanot, Dolle, Q-railing, Trumpf — zero-upload ephemeral Wasm RAM execution.

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