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.Net/WorldSession.cs

@@ -109,6 +109,38 @@ public sealed class WorldSession : IDisposable
     /// </summary>
     public event Action<HearSpeech.Parsed>? SpeechHeard;
 
+    /// <summary>
+    /// Phase I.5: fires when an <c>EmoteText (0x01E0)</c> top-level
+    /// GameMessage is received — server-driven third-person emote
+    /// announcement (e.g. "The Olthoi growls at you."). Standalone
+    /// GameMessage, NOT wrapped in 0xF7B0. Subscribers typically feed
+    /// <c>ChatLog.OnEmote</c>.
+    /// </summary>
+    public event Action<EmoteText.Parsed>? EmoteHeard;
+
+    /// <summary>
+    /// Phase I.5: fires when a <c>SoulEmote (0x01E2)</c> top-level
+    /// GameMessage is received — complex emote with optional animation
+    /// pairing. Wire layout matches EmoteText.
+    /// </summary>
+    public event Action<SoulEmote.Parsed>? SoulEmoteHeard;
+
+    /// <summary>
+    /// Phase I.5: fires when a <c>ServerMessage (0xF7E0)</c> top-level
+    /// GameMessage is received — general server-broadcast text used
+    /// for announcements, combat logs, and routine error messages.
+    /// Subscribers typically feed <c>ChatLog.OnSystemMessage</c>.
+    /// </summary>
+    public event Action<ServerMessage.Parsed>? ServerMessageReceived;
+
+    /// <summary>
+    /// Phase I.5: fires when a <c>PlayerKilled (0x019E)</c> top-level
+    /// GameMessage is received — server announcement that a player
+    /// was killed in combat. Subscribers typically feed
+    /// <c>ChatLog.OnPlayerKilled</c>.
+    /// </summary>
+    public event Action<PlayerKilled.Parsed>? PlayerKilledReceived;
+
     /// <summary>
     /// Issue #5: fires when a <c>PrivateUpdateVital (0x02E7)</c> arrives
     /// — full per-vital snapshot (ranks / start / xp / current).
@@ -615,6 +647,47 @@ public sealed class WorldSession : IDisposable
                 if (parsed is not null)
                     SpeechHeard?.Invoke(parsed.Value);
             }
+            else if (op == EmoteText.Opcode)
+            {
+                // Phase I.5: server-driven third-person emote
+                // ("The Olthoi growls at you."). Standalone GameMessage,
+                // not wrapped in 0xF7B0. Holtburger opcodes.rs:155.
+                var parsed = EmoteText.TryParse(body);
+                if (parsed is not null)
+                    EmoteHeard?.Invoke(parsed.Value);
+            }
+            else if (op == SoulEmote.Opcode)
+            {
+                // Phase I.5: complex emote (chat + paired animation).
+                // Wire layout identical to EmoteText. Holtburger
+                // opcodes.rs:158.
+                var parsed = SoulEmote.TryParse(body);
+                if (parsed is not null)
+                    SoulEmoteHeard?.Invoke(parsed.Value);
+            }
+            else if (op == ServerMessage.Opcode)
+            {
+                // Phase I.5: server announcement / system message.
+                // Holtburger opcodes.rs:167.
+                var parsed = ServerMessage.TryParse(body);
+                if (parsed is not null)
+                    ServerMessageReceived?.Invoke(parsed.Value);
+            }
+            else if (op == PlayerKilled.Opcode)
+            {
+                // Phase I.5: death announcement. Holtburger opcodes.rs:150.
+                var parsed = PlayerKilled.TryParse(body);
+                if (parsed is not null)
+                    PlayerKilledReceived?.Invoke(parsed.Value);
+            }
+            else if (op == 0x0295u)
+            {
+                // Phase I.5 stub: 0x0295 SetTurbineChatChannels lands the
+                // global chat channel list (Trade, LFG, etc). I.6 will
+                // land the parser here. For now we silently absorb the
+                // packet so it doesn't show up in ACDREAM_DUMP_OPCODES.
+                // TODO(I.6): parse + route to ChatLog.OnSetTurbineChatChannels.
+            }
             else if (op == PrivateUpdateVital.FullOpcode)
             {
                 // Issue #5: full per-vital snapshot from the server. Wire