Implement ADV text publication service

engine/Age.Engine/Hosting/IHost.cs

@@ -31,6 +31,10 @@ public interface IHost
     void FillSurfaceRect(SurfaceRectFill fill) { }
     void PresentObjectRange(GfxState gfx, long firstHandle, long count) { }
     void ConfigureAdvWaitIndicator(AdvWaitIndicatorConfig config) { }
+    // Op 0x1ce explicitly starts/stops the same animated marker that op 0x72 starts for an ADV wait.
+    void SetAdvWaitIndicatorEnabled(bool enabled) { }
+    // Op 0x20a republishes one retained ADV text layout and includes the current marker frame when active.
+    void PublishAdvTextLayout(int layoutSlot) { }
     // Op 0x199 temporarily yields the active ADV page into its registered hide-window coroutine.
     // The retained scene continues to render, but the text layout and its wait marker are suspended
     // until op 0x7c restores the saved page PC.

engine/Age.Engine/Vm/VirtualMachine.cs

@@ -624,6 +624,14 @@ public sealed class VirtualMachine
                     (int)Read(a[4]), (int)Read(a[5]), (int)Read(a[6]), (int)Read(a[7]),
                     (int)Read(a[8]), Read(a[9])));
                 return pc + 1;
+            case "u0041B9F0":
+            case "set-adv-wait-indicator-enabled": // 0x1ce: explicit marker service start/stop
+                _host.SetAdvWaitIndicatorEnabled(Read(a[0]) != 0);
+                return pc + 1;
+            case "u00420CE0":
+            case "publish-adv-text-layout": // 0x20a: publish layout and current marker frame if active
+                _host.PublishAdvTextLayout((int)Read(a[0]));
+                return pc + 1;
             case "draw-string": // 0x204 (surface slot, x, y, string)
                 _host.DrawStringToSurface((int)Read(a[0]), (int)Read(a[1]), (int)Read(a[2]), ReadStr(a[3]),
                                           _advTextStyle);