fix(D.2b): PaperdollController review fixes — player-scope Concerns, loop clarity

Code-quality review on Task 5:
- I1: Concerns was unscoped (CurrentlyEquippedLocation != None) → an NPC's
  wielded item (which also carries that wire field) triggered spurious full
  repaints. Narrowed to (WielderId==p || ContainerId==p), matching
  InventoryController; OnObjectMoved's from/to-player backstop still catches
  unwield-into-a-side-bag. Populate's own scope already prevented wrong data;
  this kills the wasted repaints.
- I2: replaced the dual-`index++` (assign-vs-skip) with a for-i loop;
  SlotIndex = SlotMap position (= the drag payload's SourceSlot on unwield).
- M1/M2: comment that the cell's SpriteResolve + the discrete-slot accept/
  reject ring (0x060011F9/F8, not the grid insert-arrow) are factory-provided.
- Added two behavioral tests: a live player wield repaints the slot
  (ObjectMoved → Concerns → Populate); an NPC's wielded item never appears on
  the doll (player-scoping).
- Synced the stale spec §4b/§6c/§8 to the Task-3 Option-1 reality (the
  optimistic wield is ContainerId-based and does NOT write WielderId).

App suite 580 passed / 0 failed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/AcDream.App.Tests/UI/Layout/PaperdollControllerTests.cs

@@ -118,4 +118,30 @@ public class PaperdollControllerTests
         Bind(layout, new ClientObjectTable());
         Assert.Equal(0u, lists[HeadSlot].Cell.EmptySprite);
     }
+
+    [Fact]
+    public void Live_player_wield_repaints_the_slot() // event-driven: ObjectMoved → Concerns → Populate
+    {
+        var (layout, lists) = BuildLayout();
+        var objects = new ClientObjectTable();
+        Bind(layout, objects);                                          // slots empty at bind
+        SeedPackItem(objects, 0xF01u, EquipMask.HeadWear);              // a helm appears in the pack (not on the doll)
+        Assert.Equal(0u, lists[HeadSlot].Cell.ItemId);
+        objects.WieldItemOptimistic(0xF01u, Player, EquipMask.HeadWear); // player wields it → ObjectMoved(to=player)
+        Assert.Equal(0xF01u, lists[HeadSlot].Cell.ItemId);             // the head slot repainted with the helm
+    }
+
+    [Fact]
+    public void Live_npc_equip_does_not_appear_on_the_doll() // player-scoped: a remote creature's wielded item never leaks
+    {
+        var (layout, lists) = BuildLayout();
+        var objects = new ClientObjectTable();
+        Bind(layout, objects);
+        const uint npc = 0x60000001u;
+        objects.AddOrUpdate(new ClientObject
+        {
+            ObjectId = 0xF02u, WielderId = npc, CurrentlyEquippedLocation = EquipMask.HeadWear,
+        });
+        Assert.Equal(0u, lists[HeadSlot].Cell.ItemId);                 // the NPC's helm is NOT on the player's doll
+    }
 }