fix(rendering): retain withdrawn attachment identities

Separate attached-child spatial withdrawal from logical teardown. ProjectionRemoved now deactivates the retained scene identity, allowing residency or destination-pose callbacks to reactivate it; resource unregister remains the sole destruction edge.

Release gate: 3,735 App tests / 3 skips; 8,219 complete-solution tests / 5 skips.

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

src/AcDream.App/Rendering/Scene/LiveRenderProjectionJournal.cs

@@ -91,7 +91,21 @@ internal sealed class LiveRenderProjectionJournal : ILiveRenderProjectionSink
             && tracked.Projection.ProjectionClass is
                 RenderProjectionClass.EquippedChild)
         {
-            Remove(tracked);
+            if (_runtime.IsCurrentRecord(tracked.Record)
+                && ReferenceEquals(
+                    tracked.Record.WorldEntity,
+                    tracked.Entity))
+            {
+                // Leaving cell presentation is not logical destruction. Keep
+                // the projection identity inactive so a later residency or
+                // destination-pose edge can reactivate the same attachment
+                // without replaying EntityReady.
+                Upsert(tracked.Record, tracked.Entity, spatiallyVisible: false);
+            }
+            else
+            {
+                Remove(tracked);
+            }
         }
     }
 

src/AcDream.App/Rendering/Scene/RenderSceneShadowRuntime.cs

@@ -323,7 +323,11 @@ internal sealed class RenderSceneShadowComparisonController :
             if (!query.TryGet(id, out RenderProjectionRecord actual))
             {
                 return $"sourceChannel={Channel(id)} id={id} field=presence "
-                    + "expected=present actual=missing";
+                    + "expected=present actual=missing "
+                    + $"expectedClass={fingerprint.ProjectionClass} "
+                    + $"serverGuid=0x{fingerprint.ServerGuid:X8} "
+                    + $"localEntityId=0x{fingerprint.EntityId:X8} "
+                    + $"parentCell=0x{fingerprint.ParentCellId:X8}";
             }
 
             string? mismatch = CompareProjection(