V3 deterministic document-render capability pack. By-value connector composition (service_kind=cli, no separate ingredient): one local pandoc CLI ingredient exposes bounded operations for readiness, supported-format discovery, and Markdown/document rendering to DOCX, PDF, HTML, or EPUB via the document.render catalog operation. Fixed-function and reproducible: no shell wrapper, no caller-supplied arbitrary pandoc flags, no filters/defaults/templates/reference-doc paths, no remote fetch options, and no model sees content. The render op writes one fixed output file under an engine-managed throwaway temp dir and captures it as result.file_ref with storage=cas. Part of the Lane-1 deterministic document toolkit alongside docling (parse) and xlsx-pack (export).