Let the tool calling loop stream what each round produces

app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingStreamEventKind.cs

@@ -0,0 +1,19 @@
+namespace AIStudio.Tools.ToolCallingSystem.Harness;
+
+/// <summary>
+/// What one event of a streamed tool calling round carries.
+/// </summary>
+public enum ToolCallingStreamEventKind
+{
+    NONE = 0,
+    
+    /// <summary>
+    /// A piece of text the model wrote, to be shown while the round is still running.
+    /// </summary>
+    TEXT_DELTA,
+    
+    /// <summary>
+    /// The round is over and the event carries its outcome.
+    /// </summary>
+    ROUND_COMPLETED,
+}