Helpers that mutate or enrich an in-memory Manifest
before it is serialised to manifest.json. The current writer surface is
intentionally narrow — it only owns the HorizonProfile bucket
derived from the canonical article-horizons registry. Workflows still
write the rest of the manifest (articleType, runId, history) directly
through mergeManifestHistory and equivalent shell helpers.
Description
Helpers that mutate or enrich an in-memory Manifest before it is serialised to
manifest.json. The current writer surface is intentionally narrow — it only owns the HorizonProfile bucket derived from the canonical article-horizons registry. Workflows still write the rest of the manifest (articleType, runId, history) directly throughmergeManifestHistoryand equivalent shell helpers.