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/RuntimeActionOwnershipTests.cs

@@ -15,11 +15,11 @@ public sealed class RuntimeActionOwnershipTests
         string program = ReadAppSource(root, "Program.cs");
 
         Assert.Contains(
-            "private readonly RuntimeActionState _runtimeActions;",
+            "private readonly GameRuntime _runtime;",
             gameWindow,
             StringComparison.Ordinal);
         Assert.Contains(
-            "_runtimeActions = new RuntimeActionState(",
+            "_runtime = new GameRuntime(new GameRuntimeDependencies(",
             gameWindow,
             StringComparison.Ordinal);
         Assert.Contains(
@@ -73,14 +73,9 @@ public sealed class RuntimeActionOwnershipTests
         Assert.Empty(Regex.Matches(
             production,
             @"\bnew\s+(?:AcDream\.Runtime\.Gameplay\.)?RuntimeSpellCastState\s*\("));
-        Assert.Equal(
-            1,
-            Regex.Matches(
-                production,
-                @"\bnew\s+RuntimeActionState\s*\(").Count
-                + Regex.Matches(
-                    production,
-                    @"RuntimeActionState\s+\w+\s*=\s*new\s*\(\s*\)").Count);
+        Assert.Empty(Regex.Matches(
+            production,
+            @"\bnew\s+RuntimeActionState\s*\("));
     }
 
     [Fact]
@@ -138,14 +133,13 @@ public sealed class RuntimeActionOwnershipTests
             itemInteraction,
             StringComparison.Ordinal);
         Assert.Contains(
-            "\"runtime action state\"",
+            "new ResourceShutdownStage(\"game runtime root\"",
             shutdown,
             StringComparison.Ordinal);
-        AssertAppearsInOrder(
+        Assert.DoesNotContain(
+            "RuntimeActionState Actions",
             shutdown,
-            "\"runtime action state\"",
-            "\"runtime inventory state\"",
-            "\"runtime entity/object lifetime\"");
+            StringComparison.Ordinal);
         Assert.False(File.Exists(Path.Combine(
             root,
             "src",