refactor(world): extract live projection mechanics

Move appearance rebinding, collision construction, default-pose resolution, local shadow ownership, and exact leave-world presentation into focused owners. Preserve retail parent ordering with staged validation, committed recovery, recursive attached-subtree withdrawal, and retryable exact teardown across parent, pickup, position, unwield, and pose-loss edges.

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

tests/AcDream.App.Tests/World/GameWindowLiveEntityCompositionTests.cs

@@ -0,0 +1,51 @@
+using System.Collections;
+using System.Reflection;
+using AcDream.App.Physics;
+using AcDream.App.Rendering;
+using AcDream.App.World;
+
+namespace AcDream.App.Tests.World;
+
+public sealed class GameWindowLiveEntityCompositionTests
+{
+    private const BindingFlags PrivateImplementation =
+        BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic;
+
+    [Theory]
+    [InlineData("RegisterLiveEntityCollision")]
+    [InlineData("MotionTableDefaultPose")]
+    [InlineData("LeaveWorldLiveEntityRuntimeComponents")]
+    [InlineData("WithdrawLiveEntityWorldProjection")]
+    [InlineData("RebindAnimatedEntityForAppearance")]
+    public void GameWindow_DoesNotReacquireExtractedLiveEntityBodies(string methodName)
+    {
+        Assert.Null(typeof(GameWindow).GetMethod(methodName, PrivateImplementation));
+    }
+
+    [Fact]
+    public void GameWindow_DoesNotOwnAnAppearanceUpdateStateType()
+    {
+        Assert.Null(typeof(GameWindow).GetNestedType(
+            "AppearanceUpdateState",
+            BindingFlags.NonPublic));
+    }
+
+    [Theory]
+    [InlineData(typeof(LiveEntityCollisionBuilder))]
+    [InlineData(typeof(LiveEntityDefaultPoseResolver))]
+    [InlineData(typeof(LiveEntityProjectionWithdrawalController))]
+    [InlineData(typeof(LocalPlayerShadowState))]
+    [InlineData(typeof(LiveEntityAppearanceBinding))]
+    public void ExtractedHelpers_DoNotOwnGuidIndexesOrBackendState(Type helperType)
+    {
+        foreach (FieldInfo field in helperType.GetFields(
+                     BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic))
+        {
+            Assert.False(typeof(IDictionary).IsAssignableFrom(field.FieldType),
+                $"{helperType.Name}.{field.Name} must resolve identity through LiveEntityRuntime.");
+            string typeName = field.FieldType.FullName ?? field.FieldType.Name;
+            Assert.DoesNotContain("Silk.NET", typeName, StringComparison.Ordinal);
+            Assert.DoesNotContain("OpenGL", typeName, StringComparison.OrdinalIgnoreCase);
+        }
+    }
+}