= [4.13.0] =
* Feature – LearnDash Experiments.
* Feature – Virtual Instructor [Experiment].
* Tweak – Added filters: `learndash_experiments`, `learndash_model_virtual_instructor_applied_to_all_courses`, `learndash_model_virtual_instructor_applied_to_all_groups`, `learndash_model_virtual_instructor_avatar_url`, `learndash_model_virtual_instructor_banned_words`, `learndash_model_virtual_instructor_course_ids`, `learndash_model_virtual_instructor_custom_instruction`, `learndash_model_virtual_instructor_error_message`, `learndash_model_virtual_instructor_group_ids`, `learndash_model_virtual_instructor_message_contains_banned_words`, `learndash_model_virtual_instructor_name`, `learndash_module_ai_chatgpt_summarizer_command_generate_summary`, `learndash_module_ai_chatgpt_summarizer_last_preserved_messages_count`, `learndash_module_ai_chatgpt_summarizer_max_context_characters`, `learndash_module_ai_chatgpt_summarizer_messages_summary_content`, `learndash_module_ai_virtual_instructor_chat_session_initial_message`, `learndash_module_ai_virtual_instructor_chat_session_max_message_length`, `learndash_module_ai_virtual_instructor_chat_session_message_is_valid`, `learndash_module_ai_virtual_instructor_chat_session_message`, `learndash_module_ai_virtual_instructor_chat_session_storage_period`, `learndash_service_chatgpt_model_max_context_window_tokens`, `learndash_template_template_paths`.