fix(vfx): bind effects after canonical placement

C3c created graphical effect, projectile, and static-animation sidecars before Runtime finished the entity's first SetPosition. One-shot F754/F755 packets could be discarded, projectiles could adopt a cell-less body, and animated statics could compete for body ownership. Keep effects behind an exact-incarnation presentation barrier, retry projectile/static binding on the committed visibility edge, and keep effect cells synchronized with canonical rebuckets. User verified spell, recall, arrow, projectile, portal, and static presentation; 90 focused App tests and the Release build pass.

tests/AcDream.App.Tests/Rendering/Vfx/EntityEffectControllerTests.cs

@@ -9,6 +9,7 @@ using AcDream.Core.Net.Messages;
 using AcDream.Core.Physics;
 using AcDream.Core.Vfx;
 using AcDream.Core.World;
+using AcDream.Runtime.Entities;
 using DatReaderWriter.DBObjs;
 using DatReaderWriter.Enums;
 using DatReaderWriter.Types;
@@ -129,6 +130,31 @@ public sealed class EntityEffectControllerTests
             return entity;
         }
 
+        public LiveEntityRecord AwaitInitialPresentation(
+            uint guid = Guid,
+            ushort generation = 1,
+            EntityEffectProfile? profile = null)
+        {
+            WorldSession.EntitySpawn spawn = Spawn(guid, generation);
+            RuntimeEntityRecord canonical = Assert.IsType<RuntimeEntityRecord>(
+                Runtime.RegisterLiveEntity(spawn).Canonical);
+            WorldEntity entity = Assert.IsType<WorldEntity>(
+                Runtime.MaterializeLiveEntity(
+                    canonical,
+                    spawn.Position!.Value.LandblockId,
+                    id => Entity(id, guid),
+                    LiveEntityProjectionKind.World,
+                    initializeProjection: exact =>
+                        exact.EffectProfile = profile ?? LiveProfile(),
+                    out LiveEntityRecord? record,
+                    LiveEntityMaterializationResidence.AwaitRuntimePlacement));
+            Assert.Same(entity, record!.WorldEntity);
+            Assert.False(record.IsSpatiallyProjected);
+            Assert.False(record.IsSpatiallyVisible);
+            Assert.True(Controller.PrepareLiveEntityOwner(guid));
+            return record;
+        }
+
         public static EntityEffectProfile LiveProfile(
             uint tableDid = TableDid,
             uint rawDefaultType = RawType,
@@ -187,6 +213,32 @@ public sealed class EntityEffectControllerTests
         Assert.Equal(1, fixture.Runner.ActiveScriptCount);
     }
 
+    [Fact]
+    public void RuntimeInitialPlacementWindow_DefersPacketsUntilPresentationBinds()
+    {
+        var fixture = new Fixture();
+        LiveEntityRecord record = fixture.AwaitInitialPresentation();
+
+        fixture.Controller.HandleDirect(new PlayPhysicsScript(Guid, DirectDid));
+        fixture.Controller.HandleTyped(
+            new PlayPhysicsScriptType(Guid, RawType, 0.5f));
+
+        Assert.Equal(2, fixture.Controller.PendingPacketCount);
+        Assert.Equal(0, fixture.Runner.ActiveScriptCount);
+
+        // Runtime has committed the first frame and the graphical placement
+        // receipt is now publishing its pose/resources.
+        record.FullCellId = 0x01010001u;
+        record.IsSpatiallyProjected = true;
+        record.IsSpatiallyVisible = true;
+        Assert.True(fixture.Controller.OnPresentationBound(record));
+        Assert.Equal(0, fixture.Controller.PendingPacketCount);
+        Assert.Equal(2, fixture.Runner.ActiveScriptCount);
+
+        fixture.Runner.Tick(0.0);
+        Assert.Equal([1u, 2u], EmitterIds(fixture.Sink));
+    }
+
     [Fact]
     public void ReadyOwnerReceivesDirectAndTypedPacketsImmediately()
     {