feat(chat): port retail's @pklite client command (EnterPkLite 0x028F)

acdream never implemented @pklite. It is a CLIENT command in retail, not a
server one — ACE has no pklite text-command handler — so typing it forwarded as
inert chat text that the server ignored.

Retail: ClientCommunicationSystem::DoPKLite @0x0057A490 rejects with
WeenieError 0x507 when ACCWeenieObject::IsPlayerKiller @0x0058C910 is true
(that returns true when EITHER the PK bit 0x20 OR the PKLite bit 0x2000000 is
set), prints "Please see @help pklite for more..." and sends nothing if given
any argument text, and otherwise calls CM_Character::Event_EnterPKLite
@0x006A13F0 — a bare 12-byte parameterless game action, opcode 0x28F, the same
shape as Event_LoginCompleteNotification beside it. Verb string at 0x007E16B0,
help text at 0x007DF0C8, failure string at 0x007D31E8; one verb, no alias.

HasPlayerFlag is a tri-state (null = the local PublicWeenieDesc has not
arrived). The existing arena gates compare `== false` because they reject on a
known-FALSE flag; retail's DoPKLite gates the other way, rejecting on
known-TRUE. So this case compares `== true` on either bit: an indeterminate
description sends rather than blocks, which matches retail trusting the server
instead of inventing a client-side suppression rule.

Landed as its own commit because it is retail-faithful on its own merits, but
the motivation is C4 route 2: ACE advances SequenceType.ObjectForcePosition in
exactly two places, and the only reachable one is Player.HandleActionEnterPkLite's
entry-collision bump (allow_pkl_bump, default on). Every admin teleport advances
ObjectTeleport instead, so @teleto-style displacement exercises route 3, not
route 2. Without this command route 2 has no connected acceptance gate at all.

Gates: complete Release solution 10,867 passed / 4 skipped / 0 failed
(9966b531 baseline 10,858/4/0; +9 = the 9 tests added). Coverage includes both
known-true rejections, the known-false success case, the tri-state unknown
case, the 12-byte wire envelope, and @pklite resolving as ClientHandled rather
than falling through to the server-text path.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/AcDream.App/UI/ClientCommandController.cs

@@ -57,7 +57,8 @@ public sealed class ClientCommandController
         Func<string?> LastTeller,
         Action ClearDesiredComponents,
         Func<bool> HasOpenVendor,
-        Action<uint?, uint> FillComponentBuyList);
+        Action<uint?, uint> FillComponentBuyList,
+        Action EnterPkLite);
 
     private readonly Bindings _bindings;
 
@@ -94,6 +95,22 @@ public sealed class ClientCommandController
                 else
                     _bindings.TeleportToPkLiteArena();
                 break;
+            // ClientCommunicationSystem::DoPKLite @ 0x0057A490 rejects with
+            // WeenieError 0x507 when ACCWeenieObject::IsPlayerKiller @
+            // 0x0058C910 is true — that is, when EITHER the PK bit (0x20) OR
+            // the PKLite bit (0x2000000) is already set. Unlike the arena
+            // gates above (which reject on a known-false flag and so already
+            // send on an indeterminate one), this gate must reject only on a
+            // known-TRUE flag: an unknown/indeterminate PublicWeenieDesc
+            // still sends, matching retail's send-and-let-the-server-decide
+            // default for a description that has not arrived yet.
+            case ClientCommandId.EnterPkLite:
+                if (HasPlayerFlag(EntityCollisionFlags.IsPK) == true
+                    || HasPlayerFlag(EntityCollisionFlags.IsPKLite) == true)
+                    _bindings.ShowWeenieError(0x0507u);
+                else
+                    _bindings.EnterPkLite();
+                break;
             case ClientCommandId.HouseRecall:
                 _bindings.TeleportToHouse();
                 break;
@@ -652,9 +669,12 @@ public sealed class ClientCommandController
         + "@afk msg <message> - Set the message that will be sent to players that send you directed chat while you are in AFK mode. Issuing \"@afk msg\" with no message will set your AFK message back to the default. Your custom AFK message is limited to 192 characters.\n";
 
     /// <summary>
-    /// Null means the local PublicWeenieDesc has not arrived yet. Retail only
-    /// rejects when it has a player object and the required bit is absent, so
-    /// unknown follows the same send-and-let-the-server-decide path.
+    /// Tri-state: null means the local PublicWeenieDesc has not arrived yet.
+    /// Callers must gate on the direction retail actually rejects in — some
+    /// gates (the arena recalls) reject on a known-false flag, others (@pklite)
+    /// reject on a known-true flag — so an unknown flag always falls through
+    /// to sending, matching retail's send-and-let-the-server-decide default
+    /// for a description that has not arrived yet.
     /// </summary>
     private bool? HasPlayerFlag(EntityCollisionFlags flag)
     {