refactor(app): extract focused window lifetime

Move the exact retryable shutdown manifest, typed root snapshot, terminal reporting, and native-window-last release out of GameWindow. Keep session and GPU convergence as hard barriers while reporting persistent physical callback cleanup without stranding dependent owners.

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

tests/AcDream.App.Tests/Rendering/WorldRenderFrameBuilderTests.cs

@@ -328,6 +328,12 @@ public sealed class WorldRenderFrameBuilderTests
     public void World_scene_uses_the_typed_builder_and_orchestrator_owns_its_local_composition()
     {
         string gameWindow = GameWindowSource();
+        string lifetime = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "src",
+            "AcDream.App",
+            "Rendering",
+            "GameWindowLifetime.cs"));
         string frameRoot = File.ReadAllText(Path.Combine(
             FindRepoRoot(),
             "src",
@@ -369,14 +375,14 @@ public sealed class WorldRenderFrameBuilderTests
             "new RenderFrameOrchestrator(",
             "d.FrameGraphs.PublishOwned(");
         AssertAppearsInOrder(
-            gameWindow,
-            "publication.Dispose();",
-            "new(\"equipped children\"",
-            "new(\"effect network state\"",
-            "new(\"audio\"",
-            "new(\"mesh draw dispatcher\"",
-            "new(\"environment cells\"",
-            "new(\"scene lighting\"");
+            lifetime,
+            "frame.FrameGraphPublication?.Dispose()",
+            "Hard(\"equipped children\"",
+            "Hard(\"effect network state\"",
+            "Hard(\"audio\"",
+            "Hard(\"mesh draw dispatcher\"",
+            "Hard(\"environment cells\"",
+            "Hard(\"scene lighting\"");
     }
 
     private static string BuilderSource() => File.ReadAllText(Path.Combine(