Stage 3: block reward 100, random halving pass-through, RZ800 14kJ, low-tier fakes, tier-mismatch always spotted

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

src/Decentralized.Domain/Mining.cs

@@ -15,6 +15,8 @@ namespace Decentralized.Domain
         /// <summary>暴毙概率的品牌系数。</summary>
         /// <summary>档次：0 低端、1 中端、2 高端、3 旗舰（显卡）。实物特征（供电口、风扇数）只看档次。</summary>
         public int Tier;
+        /// <summary>废片：只会作为假卡背后的真实芯片出现，不上架、不单独出现。低档次的卡也能被冒充靠它。</summary>
+        public bool Scrap;
         public double DeathFactor;
         /// <summary>每天损耗的系数。</summary>
         public double WearFactor;
@@ -39,7 +41,8 @@ namespace Decentralized.Domain
             Gpu("RZX60", Probidia, 0, 1.0, 4, 220), Gpu("RZX70", Probidia, 1, 5.0, 12, 800),
             Gpu("RZX80", Probidia, 2, 8.0, 18, 1300), Gpu("RZX90", Probidia, 3, 20.0, 30, 5000),
             Gpu("RZ70", Pmd, 0, 0.8, 2.5, 170), Gpu("RZ80", Pmd, 1, 4.0, 8, 680),
-            Gpu("RZ800", Pmd, 2, 8.0, 12, 1500), Gpu("RZ900", Pmd, 3, 15.0, 20, 4000),
+            Gpu("RZ800", Pmd, 2, 8.0, 14, 1500), Gpu("RZ900", Pmd, 3, 15.0, 20, 4000),
+            Scrap("RZ10", Pmd, 0, 0.3, 2, 60),
             Asic("M1", 50, 60, 11000), Asic("M2", 120, 110, 27000), Asic("M3", 300, 220, 72000),
         }.ToDictionary(s => s.Model);
 
@@ -49,6 +52,13 @@ namespace Decentralized.Domain
             DeathFactor = brand == Probidia ? 0.7 : 1.0, WearFactor = brand == Probidia ? 1.0 : 1.2,
         };
 
+        private static HardwareSpec Scrap(string model, string brand, int tier, double h, double kj, int price)
+        {
+            var s = Gpu(model, brand, tier, h, kj, price);
+            s.Scrap = true;
+            return s;
+        }
+
         private static HardwareSpec Asic(string model, double h, double kj, int price) => new HardwareSpec
         {
             Model = model, Brand = RatDigg, Hash = h, Kj = kj, Price = price, DeathFactor = 0.5, WearFactor = 0.8, Asic = true,