fix(D.2b): correct EquipMask to canonical retail INVENTORY_LOC + numeric-pin test

The old enum invented two phantom bits (HandArmor=0x2000, FootArmor=0x10000) and
used non-retail names (Necklace, LeftBracelet, RightBracelet, LeftRing, RightRing,
AetheriaRed/Yellow/Blue), shifting every slot above 0x1000 out of alignment with
retail INVENTORY_LOC (acclient.h:3193) and ACE EquipMask.

Replace the enum body with verbatim retail values. Add EquipMaskTests to
numeric-pin every member so future renumbering breaks at compile/test time.

Existing consumers (ClientObjectTable, InventoryController, GameEventWiringTests,
ClientObjectTableTests) only reference EquipMask.MeleeWeapon and EquipMask.None --
both present at their correct retail values -- so no call sites needed updating.

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

src/AcDream.Core/Items/ClientObject.cs

@@ -57,46 +57,46 @@ public enum ItemType : uint
 }
 
 /// <summary>
-/// Equipment slot bitmask. 31 slots from head to Aetheria. Paperdoll
-/// widget offsets <c>+0x604..+0x660</c> in the retail panel correspond
-/// to these bits 1:1 (see r06 §2 and UI slice 05 paperdoll section).
+/// Equipment slot bitmask — the verbatim retail <c>INVENTORY_LOC</c> enum
+/// (docs/research/named-retail/acclient.h:3193; identical to ACE's EquipMask).
+/// The wire (ValidLocations / CurrentWieldedLocation / WieldObject EquipLoc) delivers
+/// these exact bits. Pinned by EquipMaskTests — do NOT renumber.
 /// </summary>
 [Flags]
 public enum EquipMask : uint
 {
-    None          = 0,
-    HeadWear      = 0x00000001,
-    ChestWear     = 0x00000002,
-    AbdomenWear   = 0x00000004,
-    UpperArmWear  = 0x00000008,
-    LowerArmWear  = 0x00000010,
-    HandWear      = 0x00000020,
-    UpperLegWear  = 0x00000040,
-    LowerLegWear  = 0x00000080,
-    FootWear      = 0x00000100,
-    ChestArmor    = 0x00000200,
-    AbdomenArmor  = 0x00000400,
-    UpperArmArmor = 0x00000800,
-    LowerArmArmor = 0x00001000,
-    HandArmor     = 0x00002000,
-    UpperLegArmor = 0x00004000,
-    LowerLegArmor = 0x00008000,
-    FootArmor     = 0x00010000,
-    Necklace      = 0x00020000,
-    LeftBracelet  = 0x00040000,
-    RightBracelet = 0x00080000,
-    LeftRing      = 0x00100000,
-    RightRing     = 0x00200000,
-    MeleeWeapon   = 0x00400000,
-    Shield        = 0x00800000,
-    MissileWeapon = 0x01000000,
-    Held          = 0x02000000,       // lit torch, book in hand
-    MissileAmmo   = 0x04000000,
-    Cloak         = 0x08000000,
-    TrinketOne    = 0x10000000,
-    AetheriaRed   = 0x20000000,
-    AetheriaYellow= 0x40000000,
-    AetheriaBlue  = 0x80000000u,
+    None           = 0x00000000,
+    HeadWear       = 0x00000001,
+    ChestWear      = 0x00000002,
+    AbdomenWear    = 0x00000004,
+    UpperArmWear   = 0x00000008,
+    LowerArmWear   = 0x00000010,
+    HandWear       = 0x00000020,
+    UpperLegWear   = 0x00000040,
+    LowerLegWear   = 0x00000080,
+    FootWear       = 0x00000100,
+    ChestArmor     = 0x00000200,
+    AbdomenArmor   = 0x00000400,
+    UpperArmArmor  = 0x00000800,
+    LowerArmArmor  = 0x00001000,
+    UpperLegArmor  = 0x00002000,
+    LowerLegArmor  = 0x00004000,
+    NeckWear       = 0x00008000,
+    WristWearLeft  = 0x00010000,
+    WristWearRight = 0x00020000,
+    FingerWearLeft = 0x00040000,
+    FingerWearRight= 0x00080000,
+    MeleeWeapon    = 0x00100000,
+    Shield         = 0x00200000,
+    MissileWeapon  = 0x00400000,
+    MissileAmmo    = 0x00800000,
+    Held           = 0x01000000,
+    TwoHanded      = 0x02000000,
+    TrinketOne     = 0x04000000,
+    Cloak          = 0x08000000,
+    SigilOne       = 0x10000000,
+    SigilTwo       = 0x20000000,
+    SigilThree     = 0x40000000,
 }
 
 /// <summary>