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>

src/IBKRTrader.Core/Persistence/IAnalysisJournals.cs

@@ -0,0 +1,21 @@
+using System.Linq.Expressions;
+using IBKRTrader.Core.Persistence.Entities;
+
+namespace IBKRTrader.Core.Persistence;
+
+/// <summary>
+/// Entscheidungsjournal (core_decision_journal). <see cref="Write"/> darf den Trading-Pfad NIEMALS
+/// brechen – Implementierungen fangen Persistenzfehler ab (Log statt Exception).
+/// </summary>
+public interface IDecisionJournal
+{
+    void Write(CoreDecisionRecord record);
+    List<CoreDecisionRecord> Query(Expression<Func<CoreDecisionRecord, bool>> predicate, int limit = 1000);
+}
+
+/// <summary>Order-Lifecycle-Log (core_order_events). Gleiche Robustheits-Garantie wie das Journal.</summary>
+public interface IOrderEventLog
+{
+    void Write(CoreOrderEvent record);
+    List<CoreOrderEvent> Query(Expression<Func<CoreOrderEvent, bool>> predicate, int limit = 1000);
+}