为钓鱼游戏设计夜钓扩展内容

只是写法示意，不是完整程序。

// ANS 3D 海岛垂钓张力溜鱼与挣扎状态机 (ans-island-fishing.js)
export function stepAnsFishingTension(state, dt, isReeling) {
  const fishPull = state.fishStamina > 0 ? state.species.pullStrength : 0.15;
  const delta = (isReeling ? 0.42 : -0.28) + (fishPull - 0.25);
  state.tension = Math.max(0, Math.min(1, state.tension + delta * dt));
  return { snapped: state.tension >= 0.99, landed: state.distance <= 0.5 };
}