Add techfall detection

[JvmName]

Auto-end round when competitor reaches point threshold.

Changes:

• After each vote change, recalculate points for both competitors
• If either >= round.point_threshold, auto-end round
• Set end_method='techfall' and winner_id

Round model:

  async updatePoints() {
    this.red_points = calculatePoints(redVotes, ...);
    this.blue_points = calculatePoints(blueVotes, ...);
+   
+   if (this.red_points >= this.point_threshold) {
+     await this.end({method: 'techfall', winner: red});
+   } else if (this.blue_points >= this.point_threshold) {
+     await this.end({method: 'techfall', winner: blue});
+   }
  }