Stage 7.2: manipulation detection (player price push, prediction/perp forfeits)

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

src/Decentralized.Domain/Tuning.cs

@@ -203,6 +203,10 @@ namespace Decentralized.Domain
         public const double IntelBriefPrice = 120, IntelFake = 0.10;
         public static readonly double[] IntelTipPrice = { 0.01, 0.025, 0.05 }, IntelTipAcc = { 0.60, 0.80, 0.95 };
         public const int IntelRep = 20;
+        /// <summary>操纵检出：玩家自己的大单把价格推离"没有你时的水平"的对数幅度（取绝对值）低于 ManipFree 不查；
+        /// 超过后被查概率 = ManipBase + ManipSlope × (幅度 − ManipFree)，封顶 ManipMax；被查后永续账户冻结几天。</summary>
+        public const double ManipFree = 0.02, ManipBase = 0.25, ManipSlope = 6, ManipMax = 0.95;
+        public const int ManipFreezeDays = 3;
 
         /// <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);