Adds a path-penalty score that downranks files in folders named Trashed,
Dups, Backup, Copy, Old, Archive, plus a penalty for repeated path segments
(e.g. Desktop/Desktop/Files) and very deep paths. Also captures and uses
file mtime as a tiebreaker — older files are usually the originals.
Applied to all four detection passes (sha256, phash, exif, filesize+dim)
and to auto-resolve-exact.
New file_mtime column with idempotent migration.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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