Fix ADV config opacity and text lifetime

godot/GodotAdvHost.cs

@@ -65,6 +65,7 @@ public sealed class GodotAdvHost : IHost
     private long _advTextStartedMs;
     private int _activeGlyphDelayMilliseconds = 50;
     private int _messageGlyphDelayMilliseconds = 50;
+    private volatile int _messageWindowAlphaSetting;
     private bool _advTextForceComplete;
     private readonly Dictionary<int, AdvWaitIndicatorConfig> _waitIndicators = new();
     private readonly object _messageSkipLock = new();
@@ -365,7 +366,13 @@ public sealed class GodotAdvHost : IHost
         lock (_textLock) return _historyText.Values.OrderBy(batch => batch.LayoutSlot).ToArray();
     }
 
-    public int MessageWindowAlphaSetting => 0;
+    public int MessageWindowAlphaSetting => _messageWindowAlphaSetting;
+
+    public void SetMessageWindowAlphaSetting(int value)
+    {
+        _messageWindowAlphaSetting = value;
+        _timeline?.Event("message-window-alpha", new() { ["value"] = value });
+    }
 
     public void FillSurfaceRect(SurfaceRectFill fill)
     {

godot/Main.cs

@@ -1244,7 +1244,8 @@ public partial class Main : Godot.Control
         // Modal callback scripts composite their own full-screen UI while the enclosing ADV wait remains
         // parked. Live layout text is a Godot overlay rather than part of the retained surface. During a
         // raw-input callback, keep runs owned by that callback's script stack (STUDY -> MAMES) while hiding
-        // enclosing ADV runs that would otherwise leak above a nested screen such as HISTORY.
+        // enclosing ADV runs that would otherwise leak above a nested screen such as HISTORY. Native
+        // retained-glyph erases remove ordinary live runs through the host before this presentation pass.
         foreach (var label in _advTextLabels) label.Visible = false;
         if (_host.IsAdvPagePresentationSuspended) return;