Domain core: seeded RNG, asset registry, wallets, AMM pairs, mining

Pure logic layer with no game references: xoshiro128** RNG with savable
state, asset registry (PSC, CRC, CRT, CRA, SPARK, Ponero), wallets whose
taint and cost basis move with transfers, constant-product pools with
nightly reversion, and mining (Probidia/PMD GPUs, RatDigg ASICs, network
hash response, halving, wear and sudden death). 35 checks pass.

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

src/Decentralized.Domain/Tuning.cs

@@ -0,0 +1,34 @@
+namespace Decentralized.Domain
+{
+    /// <summary>
+    /// 数值（普通难度基准）。改数值只改这里。
+    /// </summary>
+    public static class Tuning
+    {
+        // 挖矿
+        public const double PscStartPrice = 100;
+        public const double BlockReward = 50;
+        public const int HalvingDays = 90;
+        public const double NpcHash0 = 360;
+        public const double NpcKjPerH = 2.4;
+        public const double ElecPrice = 1.5;
+        public const double NpcTargetRatio = 3.5;
+        public const double NpcAdj = 0.05;
+        public const double PoolFee = 0.03;
+        public const int RigPrice = 400, RigKj = 2, RigSlots = 4;
+        public const double OcHash = 1.25, OcKj = 1.40, OcWear = 1.3, OcDeath = 1.2;
+        public const double DeathBase = 0.001, DeathWorn = 0.03, FakeDeathFactor = 2;
+        public const double RefurbishHealth = 30;
+
+        // 市场
+        public const double PoolDepth0 = 50000;
+        public const double DexFee = 0.003, ExchangeFee = 0.002;
+        public const double Revert = 0.15;
+        public const double PscVol = 0.04;
+        public const double SentimentKappa = 0.02, SentimentVol = 0.02;
+        public const double PriceFloor = 0.3, PriceCeiling = 3.0;
+
+        /// <summary>主交易对（信用点一侧）的深度随天数增长。</summary>
+        public static double PoolDepth(int day) => PoolDepth0 * (1 + day / 60.0);
+    }
+}