Clear ADV History presentation on exit

docs/engine-re.md

@@ -1393,6 +1393,12 @@ Label and independently animated wait marker. Native rendering gets this layerin
 part of retained composition; the port must state it explicitly because those two elements are separate
 Godot overlays. They reappear with the same parked page after the modal frame returns.
 
+History's target-layout render batches are likewise presentation bindings, not part of the retained backlog.
+`HISTORY.BIN@0x1100` re-enables recording with op `0x1bb(1)` after erasing its object range and releasing
+surfaces `0xc0/0xc1`; that existing exit boundary now tells the host to discard all bound History batches.
+The semantic text/index records remain untouched, so reopening History rebuilds fresh rows while exiting
+cannot leave the old labels above the resumed ADV page.
+
 History's remaining work is stored voice replay through `0x1bd` and the `0xd3/0xd4/0xd5` smooth-scroll
 callback scheduler. None changes backlog ownership or requires choosing a save/profile backend.
 

docs/phase-a-slice-plan.md

@@ -1801,6 +1801,12 @@ class of inherited-state bridges.
 Godot also suppresses the parked page's ordinary dialogue Label and wait indicator while any nested timed
 raw-input frame owns the modal screen, then restores them on return. Root Control anchor presets are now
 applied after parenting, removing the remaining occurrence of the associated runtime layout diagnostic.
+
+A follow-up exit check found that the host retained the last History render batches after the script had
+erased its objects and re-enabled recording. Op `0x1bb(1)` at `HISTORY.BIN@0x1100` is now the presentation
+end boundary: it clears only the host's transient layout bindings, leaving the engine-owned backlog intact
+for the next opening. The real interaction regression requires zero active History batches after return.
+
 Validation: engine 198/198, zero-warning Godot build, threaded `SELFTEST OK`, and vm0 RECOVER clean.
 
 **Next:** manually recheck the five History rows and overlay cleanup against the original. If they match, proceed

engine/Age.Engine.Tests/HistoryInteractionOpsTests.cs

@@ -167,6 +167,8 @@ public class HistoryInteractionOpsTests
         Assert.True(host.SawRenderedText);
         Assert.True(host.HistoryReturned);
         Assert.Equal(1, host.Waits); // the enclosing ADV page was never released or re-entered
+        Assert.Equal(1, host.HistoryPresentationEnds);
+        Assert.Empty(host.ActiveHistoryRenders);
 
         var historyButtons = host.FirstHistoryFrame
             .Where(render => render.Handle >= 0xd2fa && render.Handle <= 0xd300)

engine/Age.Engine.Tests/TestSupport.cs

@@ -18,6 +18,8 @@ internal class RecordingHost : IHost
     public readonly List<(int Slot, int X, int Y)> TextCursors = new();
     public readonly List<(int Surface, int X, int Y, string Text)> SurfaceStrings = new();
     public readonly List<AdvTextHistoryRenderBatch> HistoryRenders = new();
+    public readonly Dictionary<int, AdvTextHistoryRenderBatch> ActiveHistoryRenders = new();
+    public int HistoryPresentationEnds;
     public readonly List<int> ClearedTextLayouts = new();
     public readonly List<SurfaceRectFill> SurfaceFills = new();
     public readonly List<(long First, long Count)> PresentedRanges = new();
@@ -38,8 +40,21 @@ internal class RecordingHost : IHost
         => SurfaceStrings.Add((surfaceSlot, x, y, text));
     public void DrawStringToSurface(int surfaceSlot, int x, int y, string text, AdvTextStyle style)
         => SurfaceStrings.Add((surfaceSlot, x, y, text));
-    public void ClearRenderedAdvTextLayout(int layoutSlot) => ClearedTextLayouts.Add(layoutSlot);
-    public void RenderTextHistory(AdvTextHistoryRenderBatch batch) => HistoryRenders.Add(batch);
+    public void ClearRenderedAdvTextLayout(int layoutSlot)
+    {
+        ClearedTextLayouts.Add(layoutSlot);
+        ActiveHistoryRenders.Remove(layoutSlot);
+    }
+    public void RenderTextHistory(AdvTextHistoryRenderBatch batch)
+    {
+        HistoryRenders.Add(batch);
+        ActiveHistoryRenders[batch.LayoutSlot] = batch;
+    }
+    public void EndTextHistoryPresentation()
+    {
+        HistoryPresentationEnds++;
+        ActiveHistoryRenders.Clear();
+    }
     public int MessageWindowAlphaSetting { get; set; }
     public void FillSurfaceRect(SurfaceRectFill fill) => SurfaceFills.Add(fill);
     public void PresentObjectRange(GfxState gfx, long firstHandle, long count)

engine/Age.Engine/Hosting/IHost.cs

@@ -24,6 +24,9 @@ public interface IHost
         => DrawStringToSurface(surfaceSlot, x, y, text);
     void ClearRenderedAdvTextLayout(int layoutSlot) { }
     void RenderTextHistory(AdvTextHistoryRenderBatch batch) { }
+    // History render batches are transient bindings, unlike the retained backlog itself. HISTORY.BIN's
+    // recording re-enable at exit ends that presentation and drops every bound target layout.
+    void EndTextHistoryPresentation() { }
     int MessageWindowAlphaSetting => 0;
     void FillSurfaceRect(SurfaceRectFill fill) { }
     void PresentObjectRange(GfxState gfx, long firstHandle, long count) { }

engine/Age.Engine/Vm/VirtualMachine.cs

@@ -772,7 +772,12 @@ public sealed class VirtualMachine
             case "reset-message-voice-state": // 0x1bc resets native per-message voice/queued-voice state
                 _autoVoicePending = false; return pc + 1;
             case "set-text-history-recording": // 0x1bb: HISTORY.BIN suppresses recording its own UI
-                if (Read(a[0]) is 0 or 1) TextHistory.SetRecordingEnabled(Read(a[0]) == 1);
+                if (Read(a[0]) is 0 or 1)
+                {
+                    bool enabled = Read(a[0]) == 1;
+                    TextHistory.SetRecordingEnabled(enabled);
+                    if (enabled) _host.EndTextHistoryPresentation();
+                }
                 return pc + 1;
             case "append-text-history-metadata": // 0x1d2: typed value attached to the current group
                 TextHistory.AppendMetadata(Read(a[0]), Read(a[1]), _advTextStyle); return pc + 1;

godot/GodotAdvHost.cs

@@ -149,6 +149,12 @@ public sealed class GodotAdvHost : IHost
         });
     }
 
+    public void EndTextHistoryPresentation()
+    {
+        lock (_textLock) _historyText.Clear();
+        _timeline?.Event("history-presentation-end");
+    }
+
     public IReadOnlyList<AdvTextHistoryRenderBatch> SnapshotRenderedTextHistory()
     {
         lock (_textLock) return _historyText.Values.OrderBy(batch => batch.LayoutSlot).ToArray();