fix: clean ||| from chat history and handle afterthoughts in reaction replies

- Extract _split_afterthought helper method
- Store cleaned content (no |||) in chat history to prevent LLM reinforcement
- Handle afterthought splitting in reaction-reply path too
- Log main_reply instead of raw response

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cogs/chat.py

@@ -73,6 +73,19 @@ def _format_relative_time(dt: datetime) -> str:
 
 
 class ChatCog(commands.Cog):
+
+    @staticmethod
+    def _split_afterthought(response: str) -> tuple[str, str | None]:
+        """Split a response on ||| into (main_reply, afterthought)."""
+        if "|||" not in response:
+            return response, None
+        parts = response.split("|||", 1)
+        main = parts[0].strip()
+        after = parts[1].strip() or None
+        if not main:
+            return response, None
+        return main, after
+
     def __init__(self, bot: commands.Bot):
         self.bot = bot
         # Per-channel conversation history for the bot: {channel_id: deque of {role, content}}
@@ -395,9 +408,14 @@ class ChatCog(commands.Cog):
             logger.warning("LLM returned no response for %s in #%s", message.author, message.channel.name)
             return
 
+        # Split afterthoughts (triple-pipe delimiter)
+        main_reply, afterthought = self._split_afterthought(response)
+
+        # Store cleaned content in history (no ||| delimiter)
         if not image_attachment:
+            clean_for_history = f"{main_reply}\n{afterthought}" if afterthought else main_reply
             self._chat_history[ch_id].append(
-                {"role": "assistant", "content": response}
+                {"role": "assistant", "content": clean_for_history}
             )
 
         # Reset proactive cooldown counter for this channel
@@ -415,17 +433,6 @@ class ChatCog(commands.Cog):
                 except (asyncio.TimeoutError, asyncio.CancelledError):
                     pass
 
-        # Split afterthoughts (triple-pipe delimiter)
-        main_reply = response
-        afterthought = None
-        if "|||" in response:
-            parts = response.split("|||", 1)
-            main_reply = parts[0].strip()
-            afterthought = parts[1].strip() if len(parts) > 1 else None
-            if not main_reply:
-                main_reply = response
-                afterthought = None
-
         await message.reply(main_reply, mention_author=False)
 
         if afterthought:
@@ -446,7 +453,7 @@ class ChatCog(commands.Cog):
             reply_type.capitalize(),
             message.channel.name,
             message.author.display_name,
-            response[:100],
+            main_reply[:100],
         )
 
 
@@ -518,15 +525,22 @@ class ChatCog(commands.Cog):
         if not response:
             return
 
-        self._chat_history[ch_id].append({"role": "assistant", "content": response})
+        main_reply, afterthought = self._split_afterthought(response)
+        clean_for_history = f"{main_reply}\n{afterthought}" if afterthought else main_reply
+        self._chat_history[ch_id].append({"role": "assistant", "content": clean_for_history})
+
+        await channel.send(main_reply)
+
+        if afterthought:
+            await asyncio.sleep(random.uniform(2.0, 5.0))
+            await channel.send(afterthought)
 
-        await channel.send(response)
         logger.info(
             "Reaction reply in #%s to %s (%s): %s",
             channel.name,
             member.display_name,
             emoji,
-            response[:100],
+            main_reply[:100],
         )