Mixer fee 6% per round

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/Decentralized.Domain.Tests/Program.cs

@@ -513,7 +513,7 @@ internal static class Program
             var res = m.Night(w, 3, px, rng);
             Check(res.Count == 1 && !res[0].Rugged, "到期提回");
             double rate = Mixer.RoundRate(1000);
-            Check(Near(w.Get(Assets.CRC), 1000 * 0.98 * 0.98, 1e-6) && Near(res[0].TaintAfter, 200 * (1 - rate) * (1 - rate), 1e-6), "两轮：手续费与污点按轮数递减");
+            Check(Near(w.Get(Assets.CRC), 1000 * (1 - Tuning.MixerFee) * (1 - Tuning.MixerFee), 1e-6) && Near(res[0].TaintAfter, 200 * (1 - rate) * (1 - rate), 1e-6), "两轮：手续费与污点按轮数递减");
             Check(Mixer.RoundRate(100000) < Mixer.RoundRate(1000) / 3, "存入越大匿名集占比越大，清洗越差");
             Check(m.RecentlyMixed(3) && !m.RecentlyMixed(3 + Tuning.AmlWindowDays + 1), "提回后一段时间内出金按混币来源加重");
             m.OnEvent(MarketEvent.Crackdown, 5, new Rng(1));