refactor(runtime): cut graphical host over to canonical root

Make every App composition phase borrow one GameRuntime, retire the duplicate view/event adapters, and dispose the root only after its graphical borrowers release. This preserves synchronous UI commands while giving shutdown one exact ownership ledger.

Co-authored-by: OpenAI Codex <codex@openai.com>

tests/AcDream.App.Tests/Runtime/RuntimeInventoryOwnershipTests.cs

@@ -8,7 +8,11 @@ public sealed class RuntimeInventoryOwnershipTests
         string source = ReadSource("Rendering", "GameWindow.cs");
 
         Assert.Contains(
-            "_runtimeInventory = new RuntimeInventoryState(_runtimeEntityObjects);",
+            "private readonly GameRuntime _runtime;",
+            source,
+            StringComparison.Ordinal);
+        Assert.DoesNotContain(
+            "new RuntimeInventoryState(",
             source,
             StringComparison.Ordinal);
         Assert.DoesNotContain(
@@ -77,11 +81,18 @@ public sealed class RuntimeInventoryOwnershipTests
             "_domain.Inventory.DesiredComponents",
             session,
             StringComparison.Ordinal);
-        AssertAppearsInOrder(
+        Assert.Contains(
+            "new ResourceShutdownStage(\"game runtime root\"",
             shutdown,
-            "\"runtime action state\"",
-            "\"runtime inventory state\"",
-            "\"runtime entity/object lifetime\"");
+            StringComparison.Ordinal);
+        Assert.Contains(
+            "Hard(\"game runtime\", () => DisposeGameRuntime(live.Runtime))",
+            shutdown,
+            StringComparison.Ordinal);
+        Assert.DoesNotContain(
+            "RuntimeInventoryState Inventory",
+            shutdown,
+            StringComparison.Ordinal);
     }
 
     [Fact]