refactor(runtime): close canonical gameplay ownership

Unify the toolbar shortcut manager with Runtime inventory state, route retail-ordered shortcut and spellbook command effects through the canonical owners, and make retained controllers borrow those exact instances. Remove the item-interaction transaction fallback and add graphical/no-window parity plus failure-safe terminal ownership-ledger coverage.

Co-authored-by: Codex <codex@openai.com>

src/AcDream.Core/Chat/ChatCommandTargetState.cs

@@ -42,6 +42,15 @@ public sealed class ChatCommandTargetState : IDisposable
         }
     }
 
+    public bool IsDisposed
+    {
+        get
+        {
+            lock (_gate)
+                return _disposed;
+        }
+    }
+
     /// <summary>
     /// Forget character-scoped command targets without clearing visible
     /// transcript history.