check-dupes ports directory mode only; the --manifests hak-scoped check is
manifest-integrity and moves to the depot pipeline migration. Add that
follow-up as a charter spec (import/sync/export + mdl gate + manifest dupes
into `crucible depot`), marked draft pending its own brainstorming.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
