fix(chat): translate WeenieError templates + strip Tell target punctuation + Turbine routing diagnostics

Three post-launch fixes from the 2026-04-25 live verify session.

1. WeenieError display bug. Many ACE WeenieError / WeenieErrorWithString
   codes are *informational*, not error-level — the user saw cryptic
   "WeenieError 0x051B: General" / "WeenieError 0x051D" at login, but
   those decode as "You have entered the General channel." and
   "Turbine Chat is enabled." per ACE WeenieError(WithString).cs
   templates. New static helper Core/Chat/WeenieErrorMessages.cs maps
   ~30 high-frequency codes to retail-faithful templates with `_`
   placeholder substitution. ChatLog.OnWeenieError now routes through
   Format(); unknown codes still fall back to "WeenieError 0xNNNN[: param]"
   so nothing is silently lost. New codes can be added in 30 seconds
   when the user reports one.

2. Tell target eats trailing punctuation. Retail muscle memory is
   "/t Name, message" — comma is the separator. Our split-on-whitespace
   pulled "Name," (with comma) as the target, server returned 0x052B
   "That person is not available now." because no such character.
   ChatInputParser.TryParseTargeted now strips a trailing ,;:.!? from
   the target token so "/t Caith, hi" and "/t Caith hi" both work.
   Added 7 Theory cases covering each separator + the long-form alias.

3. TurbineChat routing diagnostics. The user's ACE login showed the
   "TurbineChatIsEnabled" + "YouHaveEnteredThe_Channel" notifications
   for General/Trade/LFG, confirming TurbineChat IS active server-side.
   But outbound /g /trade /lfg might still fall back to legacy
   ChatChannel (which the server then rejects). Added diagnostic
   Console.WriteLines so the next launch shows:
     - "chat: SetTurbineChatChannels parsed enabled=true general=0x... ..."
       (when ACE sends the 0x0295 channel-id table)
     - "chat: outbound TurbineChat General room=0x... cookie=0x... len=N"
       (when SendChatCmd routes a Turbine kind through 0xF7DE)
     - "chat: outbound legacy ChatChannel Fellowship id=0x... len=N"
       (when SendChatCmd uses the legacy 0x0147 path)
     - "chat: SendChatCmd kind=General dropped (turbine.Enabled=false no legacy id)"
       (when neither path can dispatch — usually means ACE didn't send
       0x0295 yet and the kind is Turbine-only)

   Sets up Bug 3 (proper outbound TurbineChat for /g /trade /lfg) for
   a follow-up commit once the next live trace shows the actual flow.

18 new tests:
- WeenieErrorMessagesTests: 11 covering known templates + fallback.
- ChatInputParserTests: +7 Theory cases for trailing-punctuation strip.

Solution total: 1007 green (114 UI + 650 Core + 243 Core.Net), 0 warnings.

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

tests/AcDream.Core.Tests/Chat/WeenieErrorMessagesTests.cs

@@ -0,0 +1,112 @@
+using AcDream.Core.Chat;
+
+namespace AcDream.Core.Tests.Chat;
+
+/// <summary>
+/// Tests for <see cref="WeenieErrorMessages"/>. The retail client showed
+/// these as plain-language strings; we mirror that via templated lookup.
+/// Filed after the 2026-04-25 live launch where the user saw cryptic
+/// "WeenieError 0x051B" in chat for what was actually a friendly login
+/// notification.
+/// </summary>
+public sealed class WeenieErrorMessagesTests
+{
+    // ── known codes — informational, parameterised ───────────────────
+
+    [Fact]
+    public void Format_YouHaveEnteredChannel_SubstitutesParam()
+    {
+        // 0x051B = WeenieErrorWithString.YouHaveEnteredThe_Channel.
+        // Template "You have entered the _ channel." with `_` placeholder.
+        Assert.Equal(
+            "You have entered the General channel.",
+            WeenieErrorMessages.Format(0x051B, "General"));
+    }
+
+    [Fact]
+    public void Format_YouHaveEnteredChannel_WorksForEachChannelName()
+    {
+        Assert.Equal("You have entered the Trade channel.",   WeenieErrorMessages.Format(0x051B, "Trade"));
+        Assert.Equal("You have entered the LFG channel.",     WeenieErrorMessages.Format(0x051B, "LFG"));
+        Assert.Equal("You have entered the Roleplay channel.",WeenieErrorMessages.Format(0x051B, "Roleplay"));
+    }
+
+    [Fact]
+    public void Format_YouHaveLeftChannel_SubstitutesParam()
+    {
+        Assert.Equal(
+            "You have left the General channel.",
+            WeenieErrorMessages.Format(0x051C, "General"));
+    }
+
+    // ── known codes — informational, no parameter ────────────────────
+
+    [Fact]
+    public void Format_TurbineChatIsEnabled_NoParamForm()
+    {
+        // 0x051D came in WeenieError (no param) form at login.
+        Assert.Equal(
+            "Turbine Chat is enabled.",
+            WeenieErrorMessages.Format(0x051D, param: null));
+    }
+
+    // ── known codes — error-level ────────────────────────────────────
+
+    [Fact]
+    public void Format_CharacterNotAvailable_NoParam()
+    {
+        // 0x052B fired by the server when a Tell target lookup fails
+        // (e.g. the user typed "/t je, hello" → server got "je," → no
+        // character). Should read like the retail message.
+        Assert.Equal(
+            "That person is not available now.",
+            WeenieErrorMessages.Format(0x052B, param: null));
+    }
+
+    [Fact]
+    public void Format_TradeComplete()
+    {
+        Assert.Equal("Trade Complete!", WeenieErrorMessages.Format(0x0529, null));
+    }
+
+    // ── unknown codes — graceful fallback preserves debug info ───────
+
+    [Fact]
+    public void Format_UnknownCode_NoParam_FallsBackToHexForm()
+    {
+        Assert.Equal("WeenieError 0xABCD", WeenieErrorMessages.Format(0xABCD, null));
+    }
+
+    [Fact]
+    public void Format_UnknownCode_WithParam_FallsBackToColonForm()
+    {
+        Assert.Equal(
+            "WeenieError 0xDEAD: Mana Stone",
+            WeenieErrorMessages.Format(0xDEAD, "Mana Stone"));
+    }
+
+    [Fact]
+    public void Format_UnknownCode_EmptyParam_StaysAsHexOnly()
+    {
+        // Empty string param shouldn't add a stray colon.
+        Assert.Equal("WeenieError 0xCAFE", WeenieErrorMessages.Format(0xCAFE, ""));
+    }
+
+    // ── parameterised templates with non-trivial params ──────────────
+
+    [Fact]
+    public void Format_HearListAdded_SubstitutesParam()
+    {
+        Assert.Equal(
+            "Caith has been added to the list of people you can hear.",
+            WeenieErrorMessages.Format(0x0521, "Caith"));
+    }
+
+    [Fact]
+    public void Format_FailToAffectCannotBeHarmed_SubstitutesParam()
+    {
+        Assert.Equal(
+            "You fail to affect Drudge because they cannot be harmed!",
+            WeenieErrorMessages.Format(0x004F, "Drudge"));
+    }
+}