Reusable infrastructure for ingesting external content into IKE documentation corpus projects. Provides tarball download/extract, AsciiDoc topic-fragment writing with IKE-INGEST provenance attributes, topic-registry shard writing, and per-IG/per-source _includes.adoc emission. Source-specific parsers (FHIR NPM packages, FDA IFU PDFs, ISO standards, etc.) live in each corpus project's own ingest module and consume this library.