refactor(godot): report subroutines via GodotTraceSink, not the IHost queue

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

godot/GodotTraceSink.cs

@@ -0,0 +1,16 @@
+using System.Collections.Concurrent;
+using Age.Engine.Diagnostics;
+
+// Frontend-side trace consumer. Runs on the VM background thread, so it just queues the dispatched
+// call-script ids; the main thread drains them (Godot drops GD.Print from background threads). This
+// replaces the old IHost.CallScript -> GodotAdvHost.Dispatched hack: subroutine visibility is now an
+// engine fact delivered over the trace seam.
+public sealed class GodotTraceSink : ITraceSink
+{
+    public bool TracingSteps => false;
+    public readonly ConcurrentQueue<long> CallScripts = new();
+    public void Emit(in TraceEvent e)
+    {
+        if (e.Kind == TraceEventKind.CallScript) CallScripts.Enqueue(e.Id);
+    }
+}