docs: add critical reminder comments for searchable_fields and ID resolution

app/routers/api_v3_actions_hosted_file.py

@@ -210,6 +210,8 @@ async def download_file_action(
 
     # 2. Resolve File Record
     # ID Vision: Attempt to resolve the ID. 
+    # 🛑 REMINDER: If adding a new specialized 'container' object (like event_person_profile),
+    # ensure the lookup logic is mirrored here to allow direct downloads via container ID.
     # If not found in hosted_file, check if it's an event_file or archive_content ID that we can resolve.
     resolved_id = redis_lookup_id_random(record_id_random=hosted_file_id, table_name='hosted_file')