Kinematic Bike-Fit Analyzer: BDC Knee Angle & Millimeter Saddle/Stem Prescription

Deterministic 700c wheel rim / wheelbase metric homography + temporal sub-pixel joint-center trajectory + inverse 2-link leg kinematics for Δsaddle engine (.mov, .mp4, .pdf) built for Specialized Retül Alt, Wahoo Kickr, Garmin Tacx, Canyon — zero-upload ephemeral Wasm RAM execution.

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