Initial commit: ClawdDotNet

Import des bestehenden Projektstands in Git.
- .NET 10 WinForms Anwendung (Multi-Agent / Tool-System)
- .gitignore fuer Build-Artefakte, Secrets und Runtime-Daten ergaenzt

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

src/ClawdDotNet.Core/Engine/LoopGuard.cs

@@ -0,0 +1,29 @@
+using ClawdDotNet.Core.Config;
+
+namespace ClawdDotNet.Core.Engine;
+
+public sealed class LoopGuard
+{
+    private readonly LoopGuardConfig _cfg;
+    private int _steps;
+    private int _tokens;
+
+    public LoopGuard(LoopGuardConfig cfg) => _cfg = cfg;
+
+    public int Steps => _steps;
+    public int Tokens => _tokens;
+
+    public void RecordStep()
+    {
+        if (Interlocked.Increment(ref _steps) > _cfg.MaxSteps)
+            throw new LoopLimitExceededException($"Max steps ({_cfg.MaxSteps}) exceeded.");
+    }
+
+    public void RecordTokens(int count)
+    {
+        if (Interlocked.Add(ref _tokens, count) > _cfg.MaxTokens)
+            throw new LoopLimitExceededException($"Max tokens ({_cfg.MaxTokens}) exceeded.");
+    }
+}
+
+public sealed class LoopLimitExceededException(string message) : Exception(message);