40 sports. One core. Zero forks.

Plugin engine (§87)

One application.
Never one per sport.

A sport contributes nine things: definition, ruleset, event types, scoring logic, statistics, rankings, match UI, scorer UI and validation. Everything else it inherits. Families of similar sports collapse into factories, so most of the forty are configuration rather than code.

register('badminton', rallySport({
  name: 'Badminton', periodWord: 'GAME',
  config: { pointsToWin: 21, mustWinBy: 2,
            cap: 30, setsToWinMatch: 2 },
  events: [
    { type: 'point', label: 'Smash', key: 's' },
    { type: 'point', label: 'Drop',  key: 'd' },
    { type: 'fault', label: 'Fault', key: 'f' },
  ],
}));
// That is the entire sport. The scorer console, live boards,
// match centre, standings and API contracts pick it up.