Registers or audits a custom JetEngine Query Builder type with paired runtime and editor classes. Covers all six Base_Query abstract methods including set_filtered_prop, setup_query dynamic/macro merging, pagination, automatic item caching and explicit count caching, filtering, REST endpoint exposure, editor assets, and optional MCP argument conversion. Use for custom tables, HPOS-like repositories, external APIs, or bugs involving stale cache, broken filters, missing editor controls, empty MCP-created queries, or pagination.
