R8: Accounting- + Supervisor-Modul + Core-Datenfundament (S-0)

Portierung der beiden fehlenden Grundbausteine aus PolytraderSharp (voller Ausbau).

Core S-0 (Datenfundament fuer Analyse/Forensik):
- core_decision_journal + core_order_events (+ ReasonCode/Decision/OrderEvent-Enums),
  IDecisionJournal/IOrderEventLog mit fehlertoleranten EF-Impls (Handel bricht nie).
- SignalId-Durchreichung TradeSignal -> ExecutionService -> core_trade_history;
  ExecutionService schreibt an jeder Verzweigung Journal/Order-Events.
- JSONL-Log-Sink (LogJson + Dual-Sink), pure Analytik: RealizedPnlEngine (FIFO),
  TradeAnalytics, DossierBuilder. Migration AddAnalysisFoundation.

Accounting-Modul (acc_): unabhaengiger IBKR-Kontoauszug (Activity Flex Query) hinter
Interfaces mit Offline-Null-Stubs -> append-only Ledger + Periodenabrechnung/BWA + FX
(USD/EUR) + CSV/PDF (PDFsharp/MigraDoc). Steuerschicht bewusst offen (Platzhalter-Tab).
Kein Handel. Migration InitialAccounting.

Supervisor-Modul (sup_): read-only OpenRouter-Agent (Function-Calling-Loop) + read-only
Tool-Registry (8 Tools) + Profile + Dossier-Browser + Counterfactual-Job (Stub) +
Tagesbericht/MCP-Light (opt-in). Migration InitialSupervisor.

Verdrahtung: Program.cs (beide Module + Icons), slnx/App/Tests-Referenzen,
provision-db.ps1, AppSettings-Sektionen, docs/konzepte, README.

Tests: 79 -> 117 gruen (FIFO/KPIs/Dossier/JSONL, Classifier/Engine/FX/Idempotenz,
OpenRouter/Registry/Agent/MCP, STA-Konstruktion beider neuen Fenster).

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

tests/IBKRTrader.Tests/Analytics/DossierBuilderTests.cs

@@ -0,0 +1,44 @@
+using FluentAssertions;
+using IBKRTrader.Core.Analytics;
+using IBKRTrader.Core.Logging;
+using IBKRTrader.Core.Persistence.Entities;
+
+namespace IBKRTrader.Tests.Analytics;
+
+[Trait("cat", "unit")]
+public class DossierBuilderTests
+{
+    [Fact]
+    public void Build_OrdersEverythingChronologically()
+    {
+        var decisions = new[]
+        {
+            new CoreDecisionRecord { SignalId = "s", Timestamp = new DateTime(2026,1,1,0,2,0,DateTimeKind.Utc), Decision = TradeDecision.Executed },
+            new CoreDecisionRecord { SignalId = "s", Timestamp = new DateTime(2026,1,1,0,1,0,DateTimeKind.Utc), Decision = TradeDecision.Skipped }
+        };
+
+        var dossier = DossierBuilder.Build("s", decisions,
+            Array.Empty<CoreOrderEvent>(), Array.Empty<CoreTrade>(), Array.Empty<LogJson.ParsedLogLine>());
+
+        dossier.Decisions[0].Decision.Should().Be(TradeDecision.Skipped);   // frühester zuerst
+        dossier.Decisions[1].Decision.Should().Be(TradeDecision.Executed);
+    }
+
+    [Fact]
+    public void ToMarkdown_And_ToJson_ContainSignalId_AndData()
+    {
+        var decisions = new[]
+        {
+            new CoreDecisionRecord { SignalId = "sig-9", Module = "CT", Symbol = "AAPL", Side = "BUY",
+                Decision = TradeDecision.Rejected, Reason = DecisionReason.RiskRejected, Message = "Limit überschritten" }
+        };
+        var dossier = DossierBuilder.Build("sig-9", decisions,
+            Array.Empty<CoreOrderEvent>(), Array.Empty<CoreTrade>(), Array.Empty<LogJson.ParsedLogLine>());
+
+        var md = DossierBuilder.ToMarkdown(dossier);
+        md.Should().Contain("sig-9").And.Contain("RiskRejected").And.Contain("Limit überschritten");
+
+        var json = DossierBuilder.ToJson(dossier);
+        json.Should().Contain("sig-9").And.Contain("RiskRejected");
+    }
+}