fix: de-anonymize User1/User2 references in notes and reasoning text

The LLM returns note_update, reasoning, and worst_message with
anonymized names. These are now replaced with real display names
before storage, so user profiles no longer contain meaningless
User1/User2 references.

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

cogs/sentiment/__init__.py

@@ -292,6 +292,13 @@ class SentimentCog(commands.Cog):
             anon_name = finding.get("username", "")
             if anon_name in reverse_map:
                 finding["username"] = reverse_map[anon_name]
+            # De-anonymize text fields that may reference other users
+            for field in ("note_update", "reasoning", "worst_message"):
+                text = finding.get(field)
+                if text:
+                    for anon, real in reverse_map.items():
+                        text = text.replace(anon, real)
+                    finding[field] = text
 
     @staticmethod
     def _build_conversation(