refactor(runtime): own projectile simulation

Move projectile component identity, prediction invalidation, spatial worksets, authoritative corrections, and the retail physics step into AcDream.Runtime. Keep App as the DAT-shape and presentation adapter so ACE outcomes and visible behavior remain unchanged.

tests/AcDream.App.Tests/LiveEntityRuntimeFixture.cs

@@ -1,5 +1,6 @@
 using AcDream.App.Streaming;
 using AcDream.App.World;
+using AcDream.Core.Physics;
 using AcDream.Runtime.Entities;
 
 namespace AcDream.App.Tests;
@@ -20,6 +21,18 @@ internal static class LiveEntityRuntimeFixture
         return new LiveEntityRuntime(spatial, resources, lifetime);
     }
 
+    public static LiveEntityRuntime Create(
+        GpuWorldState spatial,
+        ILiveEntityResourceLifecycle resources,
+        PhysicsEngine physicsEngine,
+        uint firstLocalEntityId = RuntimeEntityDirectory.FirstLocalEntityId)
+    {
+        var lifetime = new RuntimeEntityObjectLifetime(
+            physicsEngine,
+            firstLocalEntityId);
+        return new LiveEntityRuntime(spatial, resources, lifetime);
+    }
+
     public static LiveEntityRuntime Create(
         GpuWorldState spatial,
         ILiveEntityResourceLifecycle resources,
@@ -47,4 +60,21 @@ internal static class LiveEntityRuntimeFixture
             runtimeComponentLifecycle,
             lifetime);
     }
+
+    public static LiveEntityRuntime Create(
+        GpuWorldState spatial,
+        ILiveEntityResourceLifecycle resources,
+        ILiveEntityRuntimeComponentLifecycle runtimeComponentLifecycle,
+        PhysicsEngine physicsEngine,
+        uint firstLocalEntityId = RuntimeEntityDirectory.FirstLocalEntityId)
+    {
+        var lifetime = new RuntimeEntityObjectLifetime(
+            physicsEngine,
+            firstLocalEntityId);
+        return new LiveEntityRuntime(
+            spatial,
+            resources,
+            runtimeComponentLifecycle,
+            lifetime);
+    }
 }