refactor(net): converge live session state reset

src/AcDream.Core/Chat/ChatLog.cs

@@ -62,14 +62,27 @@ public sealed class ChatLog
 
     /// <summary>
     /// Push the authoritative local-player GUID from <c>WorldSession</c>.
-    /// One-way setter — only <c>GameWindow</c> should call it, exactly
-    /// once per live session. Used by <see cref="OnLocalSpeech"/> to
+    /// The host sets it after character selection and resets it at session
+    /// teardown. Used by <see cref="OnLocalSpeech"/> to
     /// recognize ACE's HearSpeech echo of our own /say (server's
     /// HandleActionTalk broadcasts to all in range INCLUDING the
     /// sender) and re-render it as <c>"You say, ..."</c>.
     /// </summary>
     public void SetLocalPlayerGuid(uint guid) => _localPlayerGuid = guid;
 
+    /// <summary>
+    /// Reset per-session speaker classification and duplicate suppression
+    /// while preserving the visible transcript. Retail has an explicit
+    /// <c>ChatInterface::RecvNotice_ClearChatBuffer @ 0x004F2F60</c> path;
+    /// character-session teardown does not use that clear-buffer notice.
+    /// </summary>
+    public void ResetSessionIdentity()
+    {
+        _localPlayerGuid = 0u;
+        _lastSystemText = string.Empty;
+        _lastSystemAt = DateTime.MinValue;
+    }
+
     // ── Inbound adapters ─────────────────────────────────────────────────────
 
     /// <summary>Local or ranged HearSpeech (0x02BB / 0x02BC).</summary>

src/AcDream.Core/Chat/TurbineChatState.cs

@@ -93,6 +93,33 @@ public sealed class TurbineChatState
         SocietyRadiantBloodRoom  = societyRadiantBloodRoom;
     }
 
+    /// <summary>
+    /// Return the server-assigned room table and outbound context sequence to
+    /// their pre-login values. Room ids and cookies belong to one negotiated
+    /// character session and must never cross a reconnect boundary.
+    /// </summary>
+    /// <remarks>
+    /// Retail <c>CCommunicationSystem</c> construction at <c>0x005566C0</c>
+    /// starts Turbine chat disabled; SetTurbineChatChannels (0x0295) supplies
+    /// rooms per character. Cookie 1 is the Holtburger protocol-reference
+    /// initial value, with zero reserved for no context.
+    /// </remarks>
+    public void Reset()
+    {
+        Enabled = false;
+        AllegianceRoom = 0u;
+        GeneralRoom = 0u;
+        TradeRoom = 0u;
+        LfgRoom = 0u;
+        RoleplayRoom = 0u;
+        OlthoiRoom = 0u;
+        SocietyRoom = 0u;
+        SocietyCelestialHandRoom = 0u;
+        SocietyEldrytchWebRoom = 0u;
+        SocietyRadiantBloodRoom = 0u;
+        _nextContextId = 1u;
+    }
+
     /// <summary>
     /// Look up the runtime room id for a Turbine
     /// <see cref="ChatChannelKindLite"/>. Returns 0 if the channel is not