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/OpenRouterClientTests.cs

@@ -0,0 +1,55 @@
+using FluentAssertions;
+using IBKRTrader.Modules.Supervisor.Agent;
+
+namespace IBKRTrader.Tests.Modules.Supervisor;
+
+[Trait("cat", "unit")]
+public class OpenRouterClientTests
+{
+    private static SupervisorTool Tool() => new(
+        "get_kpis", "KPIs", """{"type":"object","properties":{"module":{"type":"string"}}}""", _ => "{}");
+
+    [Fact]
+    public void BuildRequestBody_IncludesModelMessagesAndTools()
+    {
+        var messages = new[] { ChatMessage.System("sys"), ChatMessage.User("frage?") };
+        var body = OpenRouterClient.BuildRequestBody("openrouter/auto", messages, new[] { Tool() });
+
+        body.Should().Contain("\"model\":\"openrouter/auto\"");
+        body.Should().Contain("\"role\":\"system\"");
+        body.Should().Contain("frage?");
+        body.Should().Contain("\"name\":\"get_kpis\"");
+        body.Should().Contain("\"parameters\"");
+    }
+
+    [Fact]
+    public void ParseResponse_ExtractsContentAndUsage()
+    {
+        const string json = """
+        {"choices":[{"message":{"content":"Antwort","role":"assistant"}}],
+         "usage":{"prompt_tokens":12,"completion_tokens":3}}
+        """;
+
+        var r = OpenRouterClient.ParseResponse(json);
+
+        r.Content.Should().Be("Antwort");
+        r.ToolCalls.Should().BeEmpty();
+        r.PromptTokens.Should().Be(12);
+        r.CompletionTokens.Should().Be(3);
+    }
+
+    [Fact]
+    public void ParseResponse_ExtractsToolCalls()
+    {
+        const string json = """
+        {"choices":[{"message":{"role":"assistant","content":null,
+          "tool_calls":[{"id":"call_1","type":"function","function":{"name":"get_kpis","arguments":"{\"module\":\"CT\"}"}}]}}]}
+        """;
+
+        var r = OpenRouterClient.ParseResponse(json);
+
+        r.ToolCalls.Should().HaveCount(1);
+        r.ToolCalls[0].Name.Should().Be("get_kpis");
+        r.ToolCalls[0].ArgumentsJson.Should().Contain("CT");
+    }
+}