Rule-engine-based list endpoint — an alternative to the simple filter.* query params on the plain list endpoint, for building complex AND/OR filter conditions. sort_by: "project_priority" is internally remapped to project_priority_index. keyword is embedded inside filter_rules; it matches via Atlas Search when enabled for the company, otherwise falls back to a regex on project_name/project_number_string. Supports fields_to_select and filter.module_uid.