Testnetz: Micro-Order-Minimum + SELL-Proportionalität extrahiert; SELL-Leiter (Phase 0.1) vorbereitet

Weiter im Muster extrahieren->testen (verhaltensneutral, clob.md):
- CopyTradingRisk.IsBelowPolymarketMinimum (Shares < 5.5 || USDC < 0.10) –
  BUY-Micro-Order-Filter verdrahtet + Tests.
- SellLogic.SellProportion (signalSize/(remaining+signalSize), Denominator<=0 -> 0)
  + Konstante MinSignificantSellRatio (0.30); SELL-Proportionalitätscheck der
  Engine ruft sie jetzt (Charakterisierung, sichert Phase-2-Umbau ab).
- SellLogic-Eskalationsleiter (Phase 0.1, NOCH NICHT verdrahtet): FirstLimit
  (HF-fest/prozentual), Floor (SellFloorPct), NextPrice (relative Stufe, auf Floor
  geclamped), IsAtFloor. Reine Grundlage fuer das spaetere SELL-Wiring.
- Tests: CopyTradingRisk-Minimum (5 Faelle) + SellLogicTests (Proportion +
  Leiter). Gesamt 154 gruen.

Build/Smoke gruen.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/PolyTrader.Tests/SellLogicTests.cs

@@ -0,0 +1,89 @@
+using PolyTrader.Modules.CopyTrading.Logic;
+using Xunit;
+using static PolyTrader.Modules.CopyTrading.Logic.SellLogic;
+
+namespace PolyTrader.Tests
+{
+    /// <summary>
+    /// Sicherheitsnetz für die SELL-Logik: Proportionalität (aktuelles Verhalten, Phase-2-Umbau)
+    /// und die Eskalationsleiter (Phase 0.1 – Preis-Stufen, Floor-Clamping).
+    /// </summary>
+    public class SellLogicTests
+    {
+        // ---------------- SellProportion ----------------
+
+        [Fact]
+        public void SellProportion_is_share_over_total_before_sell()
+        {
+            // Master hält noch 300, verkauft 200 -> 200/500 = 0.40
+            Assert.Equal(0.40m, SellProportion(masterSharesRemaining: 300m, signalSize: 200m));
+        }
+
+        [Fact]
+        public void SellProportion_small_partial_is_below_threshold()
+        {
+            // 498 Rest, 2 verkauft -> 0.004 < 0.30
+            var ratio = SellProportion(498m, 2m);
+            Assert.True(ratio < MinSignificantSellRatio);
+        }
+
+        [Fact]
+        public void SellProportion_full_exit_is_one()
+        {
+            Assert.Equal(1.0m, SellProportion(0m, 10m));
+        }
+
+        [Theory]
+        [InlineData(0, 0)]     // gar nichts
+        [InlineData(-5, 5)]    // Denominator 0
+        [InlineData(-10, 5)]   // Denominator negativ
+        public void SellProportion_guards_non_positive_denominator(double remaining, double signal)
+        {
+            Assert.Equal(0m, SellProportion((decimal)remaining, (decimal)signal));
+        }
+
+        // ---------------- Eskalationsleiter ----------------
+
+        [Fact]
+        public void FirstLimit_normal_trader_applies_percentage_discount()
+        {
+            // 0.99 * (1 - 2%) = 0.9702
+            Assert.Equal(0.9702m, FirstLimit(0.99m, isHf: false, maxPriceDifferencePct: 2m));
+        }
+
+        [Fact]
+        public void FirstLimit_hf_trader_applies_fixed_half_cent_discount()
+        {
+            Assert.Equal(0.985m, FirstLimit(0.99m, isHf: true, maxPriceDifferencePct: 99m));
+        }
+
+        [Fact]
+        public void Floor_is_reference_minus_floor_pct()
+        {
+            // 0.99 * (1 - 15%) = 0.8415
+            Assert.Equal(0.8415m, Floor(0.99m, 15m));
+        }
+
+        [Fact]
+        public void NextPrice_steps_down_relative_when_above_floor()
+        {
+            // 0.90 * (1 - 3%) = 0.873, über Floor 0.80
+            Assert.Equal(0.873m, NextPrice(0.90m, stepPct: 3m, floor: 0.80m));
+        }
+
+        [Fact]
+        public void NextPrice_clamps_to_floor()
+        {
+            // 0.82 * 0.97 = 0.7954 -> unter Floor -> 0.80
+            Assert.Equal(0.80m, NextPrice(0.82m, 3m, 0.80m));
+        }
+
+        [Fact]
+        public void IsAtFloor_is_inclusive()
+        {
+            Assert.True(IsAtFloor(0.80m, 0.80m));
+            Assert.True(IsAtFloor(0.79m, 0.80m));
+            Assert.False(IsAtFloor(0.81m, 0.80m));
+        }
+    }
+}