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>

src/AcDream.App/UI/Layout/PaperdollController.cs

@@ -57,14 +57,18 @@ public sealed class PaperdollController : IItemListDragHandler
     {
         _objects = objects; _playerGuid = playerGuid; _iconIds = iconIds; _sendWield = sendWield;
 
-        int index = 0;
-        foreach (var (element, mask) in SlotMap)
+        for (int i = 0; i < SlotMap.Length; i++)
         {
-            if (layout.FindElement(element) is not UiItemList list) { index++; continue; }
+            var (element, mask) = SlotMap[i];
+            if (layout.FindElement(element) is not UiItemList list) continue;
             list.RegisterDragHandler(this);
             list.Cell.SourceKind  = ItemDragSource.Equipment;
-            list.Cell.SlotIndex   = index++;        // a stable per-slot index (routing uses the list, not this)
-            list.Cell.EmptySprite = 0u;             // TRANSPARENT empty slot (brainstorm decision; no doll behind it)
+            list.Cell.SlotIndex   = i;              // SlotMap position = this equipped item's drag-payload SourceSlot when dragged out to unwield
+            list.Cell.EmptySprite = 0u;             // TRANSPARENT empty slot (brainstorm decision; no doll behind it in Slice 1)
+            // Cell.SpriteResolve + the default accept/reject sprites (ItemSlot_DragOver_Accept ring
+            // 0x060011F9 / reject circle 0x060011F8 — the discrete-slot frames, NOT the inventory grid's
+            // insert-arrow 0x060011F7) are already wired by DatWidgetFactory when it built the UiItemList;
+            // no need to re-set them here.
             _slots.Add((mask, list));
         }
 
@@ -85,11 +89,16 @@ public sealed class PaperdollController : IItemListDragHandler
     private void OnObjectMoved(ClientObject o, uint from, uint to)
     { if (Concerns(o) || from == _playerGuid() || to == _playerGuid()) Populate(); }
 
-    /// <summary>The object is (or just became / ceased to be) the player's equipped gear.</summary>
+    /// <summary>The object belongs to the player (wielded gear or pack contents) — so a change to it may
+    /// add/remove/repaint a doll slot. Player-scoped: an NPC's or vendor's wielded item (which also carries
+    /// CurrentlyEquippedLocation from the wire) must NOT trigger a repaint. A player-equipped item always
+    /// has WielderId==p (login, from CreateObject) or ContainerId==p (live/optimistic wield, set by
+    /// WieldItemOptimistic), so the equip-location need not be tested here; OnObjectMoved adds the from/to
+    /// player backstop for moves that transiently satisfy neither (e.g. unwield into a side bag).</summary>
     private bool Concerns(ClientObject o)
     {
         uint p = _playerGuid();
-        return o.CurrentlyEquippedLocation != EquipMask.None || o.WielderId == p || o.ContainerId == p;
+        return o.WielderId == p || o.ContainerId == p;
     }
 
     public void Populate()