Stream the answers again whenever tools are in play (#986)

app/MindWork AI Studio/Provider/Anthropic/AnthropicStreamLine.cs

@@ -0,0 +1,12 @@
+using System.Text.Json;
+
+namespace AIStudio.Provider.Anthropic;
+
+/// <summary>
+/// One line of a streamed Anthropic messages call.
+/// </summary>
+/// <param name="Type">The kind of event this line reports.</param>
+/// <param name="Index">Which content block the event belongs to; blocks are correlated by it.</param>
+/// <param name="ContentBlock">The block as it opens, for a content block start.</param>
+/// <param name="Delta">The piece this event adds, for a content block delta or a message delta.</param>
+public readonly record struct AnthropicStreamLine(string? Type, int Index, JsonElement ContentBlock, AnthropicStreamDelta Delta);