feat(net): #18 holtburger inbound chat parity - EmoteText, SoulEmote, ServerMessage, PlayerKilled, WeenieError + Windows-1252 codec

Five sub-changes:

1. Windows-1252 codec switch (global). Every Encoding.ASCII call site
   in src/AcDream.Core.Net/Messages/ -> Encoding.GetEncoding(1252).
   Touched HearSpeech, ChatRequests, GameEvents, AppraiseInfoParser,
   CharacterList, CreateObject, PlayerDescriptionParser, SocialActions.
   New Encodings.cs module-init registers CodePagesEncodingProvider
   (System.Text.Encoding.CodePages ships with .NET 10 SDK but isn't
   auto-registered). Matches retail + holtburger; accented names
   no longer round-trip-broken.

2. New parsers (opcodes confirmed against holtburger opcodes.rs):
   - EmoteText (0x01E0)     { u32 senderGuid, string16 senderName, string16 text }
   - SoulEmote (0x01E2)     same wire layout as EmoteText
   - ServerMessage (0xF7E0) { string16 message, u32 chatType }
   - PlayerKilled (0x019E)  { string16 deathMessage, u32 victimGuid, u32 killerGuid }
   Shared StringReader.cs has the CP1252 String16L primitive.

3. WorldSession dispatch. ProcessDatagram adds branches for the four
   new top-level opcodes + fires session-level events (EmoteHeard,
   SoulEmoteHeard, ServerMessageReceived, PlayerKilledReceived).
   0x0295 SetTurbineChatChannels stubbed with TODO for parallel I.6.

4. GameEventWiring routes WeenieError + WeenieErrorWithString
   (parsers existed but were unrouted) -> chat.OnWeenieError.

5. ChatLog adapters: Emote / SoulEmote ChatKind values, OnEmote,
   OnSoulEmote, OnPlayerKilled, OnWeenieError. OnLocalSpeech now
   substitutes empty sender -> "You" per holtburger client/messages.rs.
   ChatVM.FormatEntry handles new kinds (asterisk + sender + text).

22 new tests covering parser round-trips + reject-bad-opcode +
ChatLog adapter coverage + Win-1252 round-trip with non-ASCII chars.
Solution total: 881 green (210->225 in Core.Net.Tests, 606->613 in Core.Tests).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/AcDream.Core/Chat/ChatLog.cs

@@ -42,16 +42,86 @@ public sealed class ChatLog
     // ── Inbound adapters ─────────────────────────────────────────────────────
 
     /// <summary>Local or ranged HearSpeech (0x02BB / 0x02BC).</summary>
+    /// <remarks>
+    /// Phase I.5: an empty <paramref name="sender"/> is substituted with
+    /// "You" — the server uses this convention to indicate that the
+    /// player is the speaker (e.g. their own ranged shouts echo back).
+    /// Port from holtburger
+    /// <c>references/holtburger/.../client/messages.rs</c> lines 476-487.
+    /// </remarks>
     public void OnLocalSpeech(string sender, string text, uint senderGuid, bool isRanged)
     {
+        string effectiveSender = string.IsNullOrEmpty(sender) ? "You" : sender;
         Append(new ChatEntry(
             Kind: isRanged ? ChatKind.RangedSpeech : ChatKind.LocalSpeech,
-            Sender: sender,
+            Sender: effectiveSender,
             Text: text,
             SenderGuid: senderGuid,
             ChannelId: 0));
     }
 
+    /// <summary>EmoteText (0x01E0) — server-driven third-person emote.</summary>
+    public void OnEmote(string senderName, string text, uint senderGuid)
+    {
+        Append(new ChatEntry(
+            Kind: ChatKind.Emote,
+            Sender: senderName,
+            Text: text,
+            SenderGuid: senderGuid,
+            ChannelId: 0));
+    }
+
+    /// <summary>SoulEmote (0x01E2) — complex emote (chat + paired animation).</summary>
+    public void OnSoulEmote(string senderName, string text, uint senderGuid)
+    {
+        Append(new ChatEntry(
+            Kind: ChatKind.SoulEmote,
+            Sender: senderName,
+            Text: text,
+            SenderGuid: senderGuid,
+            ChannelId: 0));
+    }
+
+    /// <summary>PlayerKilled (0x019E) — death announcement.</summary>
+    /// <remarks>
+    /// Death messages are routed as <see cref="ChatKind.System"/> so they
+    /// share styling with other server announcements. The
+    /// <c>SenderGuid</c> field carries the victim guid; the
+    /// <c>ChannelId</c> field carries the killer guid (a small misuse
+    /// of the field but avoids a schema change).
+    /// </remarks>
+    public void OnPlayerKilled(string deathMessage, uint victimGuid, uint killerGuid)
+    {
+        Append(new ChatEntry(
+            Kind: ChatKind.System,
+            Sender: "",
+            Text: deathMessage,
+            SenderGuid: victimGuid,
+            ChannelId: killerGuid));
+    }
+
+    /// <summary>WeenieError (0x028A) / WeenieErrorWithString (0x028B).</summary>
+    /// <remarks>
+    /// Phase I.5: previously-orphaned parser. The server fires this when a
+    /// game-logic action fails (e.g. "you don't have enough mana", "you
+    /// can't pick that up"). Routed as <see cref="ChatKind.System"/>; the
+    /// <c>ChannelId</c> field carries the WeenieError code so plugins can
+    /// filter or react. <paramref name="param"/> is the interpolated
+    /// substring (null for plain WeenieError, set for WeenieErrorWithString).
+    /// </remarks>
+    public void OnWeenieError(uint errorId, string? param)
+    {
+        string text = string.IsNullOrEmpty(param)
+            ? $"WeenieError 0x{errorId:X4}"
+            : $"WeenieError 0x{errorId:X4}: {param}";
+        Append(new ChatEntry(
+            Kind: ChatKind.System,
+            Sender: "",
+            Text: text,
+            SenderGuid: 0,
+            ChannelId: errorId));
+    }
+
     /// <summary>GameEvent ChannelBroadcast (0x0147).</summary>
     public void OnChannelBroadcast(uint channelId, string sender, string text)
     {
@@ -129,6 +199,8 @@ public enum ChatKind
     Tell,
     System,
     Popup,
+    Emote,
+    SoulEmote,
 }
 
 public readonly record struct ChatEntry(