A true 3D singles badminton match in the browser, played under the BWF Laws of Badminton (BWF Statutes, Section 4.1), with a shuttlecock modelled as what it is: a high-drag, self-orienting body that leaves the racket skirt-first, flips cork-first within 0.22 m, and then stalls. The drag is derived from the Law 3 speed test rather than chosen. Original implementation; no libraries, no network calls, no model.

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