fix(items): port retail useability and autowear rejection

Use the exact low USEABLE_NO-bit predicate so reset/zero-valued direct-use items such as Blackmoor's Favor reach the ordinary Use request. Port AutoWear's clothing-priority blocker lookup and exact named system notice through the shared activation owner.

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

tests/AcDream.Core.Tests/Items/ItemInteractionPolicyTests.cs

@@ -78,6 +78,30 @@ public sealed class ItemInteractionPolicyTests
             Determine(owned with { Useability = ItemUseability.Contained }));
     }
 
+    [Fact]
+    public void DetermineUseResult_zeroValuedOwnedGem_isRetailItemUse()
+    {
+        var favor = Obj(0x6002) with
+        {
+            Type = ItemType.Gem,
+            ContainerId = Player,
+            OwnedByPlayer = true,
+            Flags = PublicWeenieFlags.RequiresPackSlot,
+            Useability = ItemUseability.Undef,
+        };
+
+        Assert.Equal(ItemPrimaryUseResult.ItemUse, Determine(favor));
+
+        var decision = ItemInteractionPolicy.DecideUse(Use(favor));
+        Assert.Equal(
+            new[]
+            {
+                ItemPolicyActionKind.SendUse,
+                ItemPolicyActionKind.IncrementBusy,
+            },
+            decision.Actions.Select(action => action.Kind));
+    }
+
     [Fact]
     public void DetermineUseResult_nonOwnedGameAndPlayerPaths_areDistinct()
     {
@@ -259,7 +283,7 @@ public sealed class ItemInteractionPolicyTests
         CombatUse: 0,
         ItemsCapacity: 0,
         ContainersCapacity: 0,
-        Useability: 0,
+        Useability: ItemUseability.No,
         TargetType: 0,
         OwnedByPlayer: false,
         IsContainer: false,