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Implements tryProvenanceBackfill() per Task 6 of the provenance-backfill plan: looks up a placeholder candidate by fileName+fileSize, confirms ZIP candidates via a ranged central-directory CRC32 fingerprint, and falls back to name+size confidence for RAR/7z/failed listings. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>