Chat: read the host's own wording of each line

DECAL handed the original each line as the chat window shows it, tell links
included; the host now reports the same wording (DisplayText). Kill, rare,
combat and !report parsing and the chat frame read that, with tags stripped
for the frame exactly as before; the plugin's own formatter remains only for
a line the host did not word.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/OpenAC.MosswartMassacre.Tests/Fakes/FakeAutomation.cs

@@ -400,11 +400,13 @@ public sealed class RecordingChat : IPluginChat
         string channelName = "",
         int logTextType = 0,
         int combatKind = 0,
-        uint senderObjectId = 0u)
+        uint senderObjectId = 0u,
+        string displayText = "")
     {
         var message = new PluginChatMessage(
             _nextSequence++, senderObjectId, kind, sender, text, channelName)
         {
+            DisplayText = displayText,
             LogTextType = logTextType,
             CombatKind = combatKind,
             Received = DateTimeOffset.UtcNow,