Ether 0.2.53

This release fixes Plex Media Server watch-history migration for stripped and
stale history entries, fixes CSV import/export round-tripping and CSRF upload
checks in the admin console, and ensures foreground playback retries debrid
candidates that background speculative checks cannot evaluate without adding the
torrent.

Migration and Backups

• Resolve stripped and stale Plex /status/sessions/history/all rows:
  Plex Media Server omits ratingKey, grandparentRatingKey, year, and
  <Guid> elements on historical play rows once an episode or movie has been
  upgraded, replaced, or removed from the library. Migration previews now index
  library shows and movies by title during the library scan, extract release
  years from originallyAvailableAt (YYYY-MM-DD) when year is omitted, and
  resolve stripped or stale (404) episode and movie history rows via library
  show/movie metadata and catalog search (including country suffixes such as
  (US) / (UK), trailing (YYYY) years, and normalized punctuation) (#152).
• Prefer tmdb:// GUIDs and type-scoped external ID lookups: migration now
  checks tmdb:// <Guid> tags before imdb:// and tvdb:// tags, supports
  legacy Plex agent episode GUIDs (com.plexapp.agents.thetvdb://... and
  com.plexapp.agents.themoviedb://...), and scopes external ID lookups and
  migration searches by media type so GateMoviesByHomeRelease, library
  exclusions, or overlapping TVDB movie/show IDs never hide watched titles
  (#152).
• Allow text/csv uploads on /api/adoption/migration/csv/preview: the
  admin CSRF gate (csrfOK) now permits same-origin POST uploads with
  Content-Type: text/csv (with X-Ether-Request: 1) on the CSV preview
  endpoint instead of rejecting browser CSV imports with HTTP 403 (#173).
• Round-trip episode watch history in Trakt CSV exports and imports: Trakt
  CSV exports now write the series title, premiere year, and show TMDB/IMDb IDs
  alongside season, episode, and episode_title columns for episode entries,
  and PreviewCSV resolves type=episode rows via show TMDB/IMDb/TVDB IDs or
  show title + season/episode numbers (#174).

Debrid and Resolver

• Foreground retry when a background debrid check cannot decide: when a
  speculative background check on Real-Debrid or TorBox cannot verify an unadded
  torrent without adding it to the account (core.ErrForegroundOnly), foreground
  playback now tries the higher-ranked release instead of skipping it in favor
  of a lower-ranked release already in the account (#175).