Bicycle Frame Stack & Reach Cockpit Transfer (+/-1 mm Stem, Spacer & Head-Angle Solver)

Deterministic 2D rigid-body trigonometry X_bar = Reach - (H_topcap + H_spacers + 0.5*H_clamp)*cos(HTA) + L_stem*cos(90 - HTA + alpha_stem) engine (.json, .svg, .pdf) built for Specialized Retul, Trek / Canyon, Cervélo / Pinarello, Zipp / ENVE — zero-upload ephemeral Wasm RAM execution.

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