Stage 9.2: mixer operator Tumbler storyline with key drive item

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

tests/Decentralized.Domain.Tests/Program.cs

@@ -1475,6 +1475,35 @@ internal static class Program
             finally { StoryMods.Current = saved; }
         });
 
+        Test("Tumbler 剧情线：开始条件、上门日程、混币器倍率", () =>
+        {
+            var saved = StoryMods.Current;
+            try
+            {
+                var t = new Tumbler();
+                Check(!t.TryStart(Tuning.TumblerMinDay - 1, true) && !t.TryStart(40, false), "没到日子或没解锁混币器不开始");
+                Check(t.TryStart(40, true) && t.StartDay == 41 && !t.TryStart(42, true), "开始一次，明天第一次上门");
+                Check(t.Due(40) == 0 && t.Due(41) == 1, "第 1 次在开始日");
+                t.Visited(41);
+                Check(t.Due(41) == 0 && t.Due(43) == 0 && t.Due(44) == 2, "同一天不重复，第 2 次在 +3");
+                t.Visited(44); Check(t.Due(46) == 3, "第 3 次在 +5"); t.Choice = Tumbler.Hide; t.Visited(46);
+                Check(t.Due(49) == 0 && t.Due(50) == 4, "第 4 次在 +9"); t.Visited(50);
+                Check(t.Done && t.Due(60) == 0, "结束");
+                var t2 = new Tumbler(); t2.TryStart(40, true); t2.Visited(45);
+                Check(t2.Due(46) == 2, "错过的上门往后补");
+                // 混币器倍率
+                var sm = new StoryMods(); StoryMods.Current = sm;
+                double fee0 = Mixer.Fee, rate0 = Mixer.RoundRate(1000);
+                sm.Apply("tumbler_kept", 50);
+                Check(Math.Abs(Mixer.Fee - fee0 * Tuning.TumblerKeptFee) < 1e-12 && Mixer.RoundRate(1000) > rate0, "藏好密钥盘：手续费降、匿名集变大");
+                var sm2 = new StoryMods(); StoryMods.Current = sm2; sm2.Apply("tumbler_sold", 50);
+                Check(Mixer.Fee > fee0 && sm2.MixerRug == Tuning.TumblerSoldRug, "卖给黑市：手续费涨、跑路概率上升");
+                var sm3 = new StoryMods(); sm3.Apply("tumbler_reported", 50);
+                Check(sm3.MixerClosed, "举报：混币器关闭");
+            }
+            finally { StoryMods.Current = saved; }
+        });
+
         Test("预测市场：先验概率", () =>
         {
             Check(Math.Abs(PredictMath.PurityAtLeast(8500, 8000, 8999) - 0.5) < 1e-9, "纯度 8500 以上一半");