Add Tier 3 commands: guild management, PvP, ready check, and duel forfeit

- Guild commands: /ginfo, /groster, /gmotd, /gpromote, /gdemote, /gquit, /ginvite
- PvP toggle: /pvp to toggle PvP flag
- Ready check system: /readycheck, /ready, /notready for group coordination
- Duel forfeit: /yield, /forfeit, /surrender to cancel active duels

include/game/game_handler.hpp

@@ -235,6 +235,25 @@ public:
     void followTarget();
     void assistTarget();
 
+    // PvP
+    void togglePvp();
+
+    // Guild commands
+    void requestGuildInfo();
+    void requestGuildRoster();
+    void setGuildMotd(const std::string& motd);
+    void promoteGuildMember(const std::string& playerName);
+    void demoteGuildMember(const std::string& playerName);
+    void leaveGuild();
+    void inviteToGuild(const std::string& playerName);
+
+    // Ready check
+    void initiateReadyCheck();
+    void respondToReadyCheck(bool ready);
+
+    // Duel
+    void forfeitDuel();
+
     // ---- Phase 1: Name queries ----
     void queryPlayerName(uint64_t guid);
     void queryCreatureInfo(uint32_t entry, uint64_t guid);

include/game/opcodes.hpp

@@ -85,6 +85,31 @@ enum class Opcode : uint16_t {
     CMSG_SHOWING_HELM                = 0x2B9,
     CMSG_SHOWING_CLOAK               = 0x2BA,
 
+    // ---- PvP ----
+    CMSG_TOGGLE_PVP                  = 0x253,
+
+    // ---- Guild ----
+    CMSG_GUILD_INVITE                = 0x082,
+    CMSG_GUILD_ACCEPT                = 0x084,
+    CMSG_GUILD_DECLINE_INVITATION    = 0x085,
+    CMSG_GUILD_INFO                  = 0x087,
+    CMSG_GUILD_GET_ROSTER            = 0x089,
+    CMSG_GUILD_PROMOTE_MEMBER        = 0x08B,
+    CMSG_GUILD_DEMOTE_MEMBER         = 0x08C,
+    CMSG_GUILD_LEAVE                 = 0x08D,
+    CMSG_GUILD_MOTD                  = 0x091,
+    SMSG_GUILD_INFO                  = 0x088,
+    SMSG_GUILD_ROSTER                = 0x08A,
+
+    // ---- Ready Check ----
+    MSG_RAID_READY_CHECK             = 0x322,
+    MSG_RAID_READY_CHECK_CONFIRM     = 0x3AE,
+
+    // ---- Duel ----
+    CMSG_DUEL_ACCEPTED               = 0x16C,
+    CMSG_DUEL_CANCELLED              = 0x16D,
+    SMSG_DUEL_REQUESTED              = 0x167,
+
     // ---- Random Roll ----
     MSG_RANDOM_ROLL                  = 0x1FB,
 

include/game/world_packets.hpp

@@ -802,6 +802,88 @@ public:
     static network::Packet build(bool show);
 };
 
+// ============================================================
+// PvP
+// ============================================================
+
+/** CMSG_TOGGLE_PVP packet builder */
+class TogglePvpPacket {
+public:
+    static network::Packet build();
+};
+
+// ============================================================
+// Guild Commands
+// ============================================================
+
+/** CMSG_GUILD_INFO packet builder */
+class GuildInfoPacket {
+public:
+    static network::Packet build();
+};
+
+/** CMSG_GUILD_GET_ROSTER packet builder */
+class GuildRosterPacket {
+public:
+    static network::Packet build();
+};
+
+/** CMSG_GUILD_MOTD packet builder */
+class GuildMotdPacket {
+public:
+    static network::Packet build(const std::string& motd);
+};
+
+/** CMSG_GUILD_PROMOTE_MEMBER packet builder */
+class GuildPromotePacket {
+public:
+    static network::Packet build(const std::string& playerName);
+};
+
+/** CMSG_GUILD_DEMOTE_MEMBER packet builder */
+class GuildDemotePacket {
+public:
+    static network::Packet build(const std::string& playerName);
+};
+
+/** CMSG_GUILD_LEAVE packet builder */
+class GuildLeavePacket {
+public:
+    static network::Packet build();
+};
+
+/** CMSG_GUILD_INVITE packet builder */
+class GuildInvitePacket {
+public:
+    static network::Packet build(const std::string& playerName);
+};
+
+// ============================================================
+// Ready Check
+// ============================================================
+
+/** MSG_RAID_READY_CHECK packet builder */
+class ReadyCheckPacket {
+public:
+    static network::Packet build();
+};
+
+/** MSG_RAID_READY_CHECK_CONFIRM packet builder */
+class ReadyCheckConfirmPacket {
+public:
+    static network::Packet build(bool ready);
+};
+
+// ============================================================
+// Duel
+// ============================================================
+
+/** CMSG_DUEL_CANCELLED packet builder */
+class DuelCancelPacket {
+public:
+    static network::Packet build();
+};
+
 // ============================================================
 // Random Roll
 // ============================================================