List built-in workflow templates
Value
Either a list of built-in template descriptors keyed by
template_ref, or a single descriptor when template_ref is supplied.
Built-in refs are diagnostic_check, sbc_check, branch_comparison,
branch_and_modify_fit, and review_decision.
Details
Built-in templates create nodes directly or call workflow
functions such as bg_branch(continue = ) or bg_record_decision(). The REPL
uses the same registry to execute template-backed actions.