feat(runtime): own initial create residence transaction

tests/AcDream.Core.Tests/Physics/MotionSequenceGateTests.cs

@@ -118,6 +118,35 @@ public class PhysicsTimestampGateTests
         Assert.True(gate.TryAcceptMovementEvent(4, 0x9011, 2));
     }
 
+    [Fact]
+    public void PreviewCreateObject_MatchesSeedDispositionWithoutMutation()
+    {
+        var gate = new PhysicsTimestampGate();
+
+        Assert.Equal(CreateObjectTimestampDisposition.InitialGeneration,
+            gate.PreviewCreateObject(instance: 7));
+        Assert.Equal(CreateObjectTimestampDisposition.InitialGeneration,
+            gate.SeedForCreateObject(10, 20, 30, 40, 50, 60, 70, 80, 7));
+
+        Assert.Equal(CreateObjectTimestampDisposition.ExistingGeneration,
+            gate.PreviewCreateObject(instance: 7));
+        Assert.Equal(CreateObjectTimestampDisposition.NewGeneration,
+            gate.PreviewCreateObject(instance: 8));
+        Assert.Equal(CreateObjectTimestampDisposition.StaleGeneration,
+            gate.PreviewCreateObject(instance: 6));
+
+        // Preview is observational: all timestamp channels still compare
+        // against the original instance-seven seed afterward.
+        Assert.True(gate.TryAcceptMovementEvent(
+            instance: 7,
+            movement: 21,
+            serverControlledMove: 60));
+        Assert.False(gate.TryAcceptMovementEvent(
+            instance: 8,
+            movement: 22,
+            serverControlledMove: 60));
+    }
+
     [Fact]
     public void SameGenerationCreateObject_MixedChannelsAreAcceptedIndependently()
     {

tests/AcDream.Runtime.Tests/Physics/RuntimeAuthoritativePositionRouteClassifierTests.cs

@@ -48,7 +48,7 @@ public sealed class RuntimeAuthoritativePositionRouteClassifierTests
     [Theory]
     [InlineData(RuntimeCreateResidenceKind.Parented)]
     [InlineData(RuntimeCreateResidenceKind.PickedUp)]
-    internal void NewParentedOrPickedUpCreate_LeavesWorldAndAwaitsPosition(
+    internal void NewParentedOrPickedUpCreate_RemainsCelllessAndAwaitsPosition(
         RuntimeCreateResidenceKind residence)
     {
         RuntimeAuthoritativePositionRoute route =
@@ -62,7 +62,7 @@ public sealed class RuntimeAuthoritativePositionRouteClassifierTests
 
         Assert.Equal(RuntimeAuthoritativePositionDisposition.AwaitFreshPosition,
             route.Disposition);
-        Assert.True(route.LeaveWorld);
+        Assert.False(route.LeaveWorld);
         Assert.False(route.PerformsSetPosition);
     }
 
@@ -294,7 +294,7 @@ public sealed class RuntimeAuthoritativePositionRouteClassifierTests
         RuntimeAuthoritativePositionRoute route = ClassifyLocal(
             Authority(ushort.MaxValue, 0));
 
-        Assert.Equal(RuntimeAuthoritativePositionDisposition.SetPosition,
+        Assert.Equal(RuntimeAuthoritativePositionDisposition.SetPositionSimple,
             route.Disposition);
         Assert.Equal(0x1012u, (uint)route.SetPositionFlags);
         Assert.True(route.UnparentBeforeRouting);