Rewrite run_pipeline's download->import section to download into a per-job
staging dir (cleared before each candidate), verify completeness there,
promote only a complete album into the library via import_album, tag the
final dir, then DB-import. The staging dir is always removed in a
try/finally, so a partial/failed download never touches or corrupts the
library, and a retry can no longer leave orphan files behind.
Also point test_upgrade_e2e.py's run_pipeline call at dest_root="/tmp/lib"
(matching every other pipeline test) since import_album now unconditionally
creates the final dir, which requires a writable dest_root.
The monitor's quality-upgrade path was inert: run_pipeline's intake
short-circuit treated any existing LibraryItem as "done", so a
monitor-driven upgrade job for a below-cutoff copy jumped straight to
imported without downloading. Intake now checks whether the job is
monitor-driven (Request.monitoredReleaseId IS NOT NULL) and, if so,
only short-circuits when the existing copy already meets the quality
cutoff; plain manual requests keep exact slice-1 behavior. Also drops
an unused `field` import in browser.py.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jonathan