fix(combat): synchronize auto-target presentation

Make the retained toolbar consume retail's payload-free selection notice from canonical live state so a reentrant Auto Target replacement cannot be erased by the outer clear. Restrict automatic acquisition to the requested hostile non-player monster policy and record the intentional PK edge divergence.

Co-Authored-By: Codex <codex@openai.com>

tests/AcDream.App.Tests/UI/Layout/SelectedObjectControllerTests.cs

@@ -171,6 +171,38 @@ public class SelectedObjectControllerTests
         Assert.Empty(textChild.LinesProvider());
     }
 
+    [Fact]
+    public void ReentrantAutoTargetNotice_RendersCurrentReplacementNotStaleClear()
+    {
+        const uint Dead = 0xAA00u;
+        const uint Replacement = 0xAA01u;
+        var (layout, nameEl, _, _) = FakeLayout();
+        var h = new Harness();
+        h.NameMap[Dead] = "Dead Drudge";
+        h.NameMap[Replacement] = "Drudge Prowler";
+        h.StackMap[Dead] = 1u;
+        h.StackMap[Replacement] = 1u;
+
+        h.Selection.Select(Dead, SelectionChangeSource.World);
+        // CombatTargetController is registered before the retained toolbar in
+        // production. Its clear handler selects a replacement reentrantly.
+        h.Selection.Changed += transition =>
+        {
+            if (transition.SelectedObjectId is null)
+                h.Selection.Select(Replacement, SelectionChangeSource.System);
+        };
+        h.Bind(layout);
+
+        h.Selection.Clear(
+            SelectionChangeSource.System,
+            SelectionChangeReason.CombatTargetDied);
+
+        Assert.Equal(Replacement, h.Selection.SelectedObjectId);
+        var lines = nameEl.Children.OfType<UiText>().Single().LinesProvider();
+        Assert.Single(lines);
+        Assert.Equal("Drudge Prowler", lines[0].Text);
+    }
+
     // ── H1: Select a health target — meter does NOT show on select alone ─────
 
     [Fact]