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/Tools/AgentToolContext.cs

@@ -0,0 +1,16 @@
+using ClawdDotNet.Core.State;
+using Microsoft.Extensions.Logging;
+
+namespace ClawdDotNet.Core.Tools;
+
+public sealed record AgentToolContext(
+    string AgentId,
+    string InstanceId,
+    IReadOnlyDictionary<string, object?> ToolConfig,
+    IStateStore StateStore,
+    ILogger Logger,
+    CancellationToken CancellationToken,
+    string? WorkspacePath = null,
+    string? SharedWorkspacePath = null,
+    IAgentMessageRouter? MessageRouter = null
+);