feat: route sentiment note_updates into memory system

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

cogs/sentiment/__init__.py

@@ -1,6 +1,6 @@
 import asyncio
 import logging
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 
 
 import discord
@@ -375,10 +375,20 @@ class SentimentCog(commands.Cog):
                     db_message_id, self._dirty_users,
                 )
 
-        # Note update
+        # Note update — route to memory system
         if note_update:
+            # Still update the legacy notes for backward compat with analysis prompt
             self.bot.drama_tracker.update_user_notes(user_id, note_update)
             self._dirty_users.add(user_id)
+            # Also save as an expiring memory (7d default for passive observations)
+            asyncio.create_task(self.bot.db.save_memory(
+                user_id=user_id,
+                memory=note_update[:500],
+                topics=db_topic_category or "general",
+                importance="medium",
+                expires_at=datetime.now(timezone.utc) + timedelta(days=7),
+                source="passive",
+            ))
 
         self._dirty_users.add(user_id)