collectArchiveCleanupTargets() now includes companion files (.sfv, .nfo,
.md5, .sha1, .sha256, .crc, .srr) that share the same base stem as the
archive parts. Previously these were left as orphans after archive cleanup.
Applies to all archive types: multipart RAR, single RAR, ZIP, split ZIP,
7z, and split 7z.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>