Multipart ZIP fingerprint reads now use per-part sizes instead of the
whole-archive total, so the tail download offset stays within the last
part's bounds on both the scanned side and the destination-copy side
(scannedFileId replaced with an ordered scannedParts list). A fingerprint
comparison is now only treated as a real mismatch when both sides have
complete CRCs and differ; incomplete comparisons (e.g. empty files) fall
back to name+size confidence instead of silently refusing to backfill.
Name+size-confidence backfills now also create an INFO
INTEGRITY_AUDIT systemNotification for later review.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
When multiple placeholder packages share the same name+size, try to
disambiguate via ZIP fingerprint; if that can't uniquely resolve a
single match, emit a SystemNotification and skip the backfill rather
than attributing provenance to the wrong package.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Rebuild-created placeholder candidates have no PackageFile CRCs, so
name-side fingerprinting can't confirm them. When the stored candidate
fingerprint is incomplete, read the candidate's own copy from its
destination message and fingerprint against that instead of falling
straight to name+size confidence.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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>
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