fix: rename Note.metadata → entity_meta (reserved by SQLAlchemy Declarative API)

SQLAlchemy reserves 'metadata' as a class attribute on declarative models.
Renamed to 'entity_meta' with explicit column name 'metadata' so the DB
column is unchanged but the Python attribute no longer conflicts.

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

src/fabledassistant/services/tools.py

@@ -2043,7 +2043,7 @@ async def execute_tool(
                 body="\n".join(body_lines),
                 tags=["person"],
                 note_type="person",
-                metadata=meta,
+                entity_meta=meta,
             )
             _schedule_embedding(note.id, user_id, name, note.body)
             return {"success": True, "type": "person", "data": {"id": note.id, "name": name}}
@@ -2075,7 +2075,7 @@ async def execute_tool(
                 body="\n".join(body_lines),
                 tags=["place"],
                 note_type="place",
-                metadata=meta,
+                entity_meta=meta,
             )
             _schedule_embedding(note.id, user_id, name, note.body)
             return {"success": True, "type": "place", "data": {"id": note.id, "name": name}}
@@ -2101,7 +2101,7 @@ async def execute_tool(
                 body=body,
                 tags=tags,
                 note_type="list",
-                metadata=meta,
+                entity_meta=meta,
             )
             _schedule_embedding(note.id, user_id, name, body)
             return {"success": True, "type": "list", "data": {"id": note.id, "name": name, "item_count": len(items)}}