Halving now raises the price anchor (pass-through 0.6, ramp the week before) with a pre-halving news item

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

tests/Decentralized.Domain.Tests/Program.cs

@@ -248,6 +248,21 @@ internal static class Program
             Check(hi.Price <= 300 + 1e-9, $"上限 3 倍：{hi.Price:0.0}");
         });
 
+        Test("市场：减半抬高价格锚（逐日靠拢），减半前一周有预期行情", () =>
+        {
+            Check(Near(Market.SupplyTarget(10, Tuning.BlockReward), 1.0, 1e-9), "减半前很远：目标因子 1");
+            double before = Market.SupplyTarget(89, Tuning.BlockReward), start = Market.SupplyTarget(83, Tuning.BlockReward);
+            Check(start > 1.0 && before > start && before <= 1 + Tuning.HalvingRamp + 1e-9, $"减半前 7 天逐日抬高，最多 +8%：{start:0.000} → {before:0.000}");
+            double after = Market.SupplyTarget(91, Tuning.BlockReward / 2);
+            Check(Near(after, Math.Pow(2, Tuning.HalvingPassThrough), 1e-9), $"减半后目标因子 2^0.6 = {after:0.000}");
+            var m = new Market();
+            for (int i = 0; i < 7; i++) m.UpdateSupply(91 + i, Tuning.BlockReward / 2);
+            Check(m.Supply > 1.0 && m.Supply < after, "逐晚靠拢目标，不一次跳到位");
+            for (int i = 0; i < 40; i++) m.UpdateSupply(100 + i % 5, Tuning.BlockReward / 2);
+            Check(Near(m.Supply, after, 0.02), "几十晚后基本到位");
+            Check(m.Anchor(new MarketEvent[0]) > Tuning.PscStartPrice * 1.4, "锚随之上移");
+        });
+
         Test("市场：其他交易对每晚被套利拉向参考价，三角价差收敛", () =>
         {
             var m = Market.CreateDefault(1);