Keep downloaded EPUBs so kobodl can skip them on future syncs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

infra/ansible/playbook.yml

@@ -544,10 +544,11 @@
           docker compose exec -T kobodl kobodl --config /home/config/kobodl.json book get --get-all --output-dir /downloads
 
           # Import any new EPUBs into Calibre library
+          # Files are kept in /downloads so kobodl can skip them next run
           docker compose exec -T --user abc calibre-web sh -c '
             for f in /downloads/*.epub; do
               [ -f "$f" ] || continue
-              calibredb add "$f" --with-library /library/ && rm "$f"
+              calibredb add "$f" --with-library /library/ || true
             done
           '
       tags: calibre