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/Modules/Supervisor/SupervisorToolRegistryTests.cs

@@ -0,0 +1,47 @@
+using FluentAssertions;
+using IBKRTrader.Modules.Supervisor.Agent;
+
+namespace IBKRTrader.Tests.Modules.Supervisor;
+
+[Trait("cat", "unit")]
+public class SupervisorToolRegistryTests
+{
+    private static SupervisorToolRegistry WithEcho()
+    {
+        var reg = new SupervisorToolRegistry();
+        reg.Register(new SupervisorTool("echo", "Echo", """{"type":"object","properties":{"x":{"type":"string"}}}""",
+            args => SupervisorToolRegistry.GetString(args, "x") ?? "(leer)"));
+        return reg;
+    }
+
+    [Fact]
+    public void UnknownTool_ReturnsErrorText_DoesNotThrow()
+    {
+        var reg = WithEcho();
+        reg.Execute("nope", "{}").Should().StartWith("FEHLER: Unbekanntes Tool");
+    }
+
+    [Fact]
+    public void InvalidJsonArgs_ReturnsErrorText()
+    {
+        var reg = WithEcho();
+        reg.Execute("echo", "{ kaputt").Should().StartWith("FEHLER: Ungültige Tool-Argumente");
+    }
+
+    [Fact]
+    public void ExecutesRegisteredTool()
+    {
+        var reg = WithEcho();
+        reg.Execute("echo", """{"x":"hallo"}""").Should().Be("hallo");
+    }
+
+    [Fact]
+    public void ToolException_IsCaught_AsErrorText()
+    {
+        var reg = new SupervisorToolRegistry();
+        reg.Register(new SupervisorTool("boom", "Boom", """{"type":"object"}""",
+            _ => throw new InvalidOperationException("geplatzt")));
+
+        reg.Execute("boom", "{}").Should().Contain("geplatzt");
+    }
+}