refactor(runtime): own inventory transaction state

Move the retail one-request-at-a-time gate, shared use busy references, external-container state, item mana, shortcuts, and desired-component snapshots into one Runtime-owned graph over J3's exact ClientObjectTable. Retained UI and session routing now borrow that owner; reset and shutdown preserve the existing order while failure/reentrancy tests protect the transaction boundary.

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

src/AcDream.App/Net/LiveSessionResetManifest.cs

@@ -18,6 +18,7 @@ internal sealed class LiveSessionResetBindings
     public required Action EquippedChildren { get; init; }
     public required Action ExternalContainer { get; init; }
     public required Action InteractionAndSelection { get; init; }
+    public required Action InventoryTransactions { get; init; }
     public required Action SelectionPresentation { get; init; }
     public required Action ObjectTable { get; init; }
     public required Action Spellbook { get; init; }
@@ -67,6 +68,7 @@ internal static class LiveSessionResetManifest
             new("equipped children", bindings.EquippedChildren),
             new("external container", bindings.ExternalContainer),
             new("interaction and selection", bindings.InteractionAndSelection),
+            new("inventory transactions", bindings.InventoryTransactions),
             new("selection presentation", bindings.SelectionPresentation),
             new("object table", bindings.ObjectTable),
             new("spellbook", bindings.Spellbook),