Generated the JSON contracts of providers, the runtime, and services at compile time (#1150)

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

@@ -14,5 +14,5 @@ public sealed record AnthropicStreamMessage
     /// <summary>
     /// What the request carried, where the stream states it.
     /// </summary>
-    public AnthropicUsage? Usage { get; init; }
+    public AnthropicUsage? Usage { get; set; }
 }