ReadonlyartifactRepo-relative path of the artifact being cleaned (e.g.
analysis/daily/2026-01-15/breaking-run1/intelligence/synthesis-summary.md).
Used to resolve relative links/images against.
Optional ReadonlyseenShared set of mermaid-body hashes seen so far in the aggregate document. Identical blocks are replaced with a cross-reference comment; the caller owns the set so it persists across artifacts.
Options controlling artifact cleanup.