refactor(app): key live projections by runtime identity

Move materialized live-object sidecars and presentation worksets to exact RuntimeEntityKey ownership. Runtime remains the only GUID/incarnation/local-ID authority while hydration, animation, effects, lights, equipped children, renderer resources, visibility, liveness, and teardown resolve exact projection identities. Preserve synchronous callbacks, local-ID allocation order, and current rendering behavior.

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

@@ -11,7 +11,8 @@ public sealed class LiveEntityRuntimeTeardownControllerTests
     [Fact]
     public void Retry_ReusesPlanAndDoesNotReplayCompletedOwners()
     {
-        LiveEntityRecord record = new(Spawn());
+        LiveEntityRecord record =
+            LiveEntityTestFixture.CreateExactProjectionRecord(Spawn());
         int factoryCalls = 0;
         int completedOwnerCalls = 0;
         int retryingOwnerCalls = 0;