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Operator-requested: a worker download must be tagged + provenance-associated exactly like an extracted zip, and the path must log well (we won't get it right first try). - _route_files now mirrors download_service._phase3_persist branch-for-branch: imported/superseded → collect member_image_ids+image_id (provenance-linked via the synthesized sidecar, same as extracted-zip members) → caller enqueues tag_and_embed + generate_thumbnail; attached → drop on-disk original, and warn on an UNEXTRACTED archive (#718 symptom); skipped duplicate → unlink; failed → unlink + warn. - Logging at every stage: start (link/host/post/artist/attempt/url), requeue, fetch result (files/bytes) or fetch failure, per-file import decision, dead- letter transitions, and done (files/images/duration). - Parity test: an archive downloaded by the worker is extracted, provenance- linked to the SAME post, and tag_and_embed+generate_thumbnail are queued for exactly the member images. Refs FC #830. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>