test(fixtures): seed PATH OF PAIN bucket with 10 worst-case fixtures

10 pathological release names mined from the real downloads folder.
Each fixture locks in the current parse_release output (including
its silent losses and false positives) so future parser improvements
are intentional, not silent drift.

Cases:
- Khruangbin yt-dlp slug (UTF-8 wide pipe '｜', YT ID as group)
- Deutschland 83-86-89 franchise box (group=S03 misdetection)
- Chérie Le BéBé (accented chars preserved, VFF language)
- Jimmy Carr 8-word stand-up special title
- [ OxTorrent.vc ] prefix + XviD codec (site_tag prefix)
- Prodiges S12E01 with episode title + air-date silently lost
- The Prodigy: apostrophe + Blu-ray dash + 1080i + multi-word audio
  = full AI-path degeneration (everything UNKNOWN)
- Sleaford Mods yt-dlp slug (YT ID glued to year)
- Super Mario Bros [FR-EN] (bilingual tag mistaken for group)
- Gilmore Girls Complete S01-S07 (the well-behaved exception:
  COMPLETE token correctly drives tv_complete + REPACK + 10bit)

Also adds shitty + path_of_pain to the per-bucket sanity assertion.

Suite: 1020 passed, 8 skipped.

CHANGELOG.md

@@ -32,6 +32,17 @@ callers).
   media_type=unknown), apostrophe-in-name (Honey Don't, captures full AI-path
   degeneration), SUBS-tag movie (Hook), space separators (Predator Badlands,
   captures group=UNKNOWN), subs-only release (Westworld S04).
+  PATH OF PAIN bucket seeded with 10 worst-case fixtures covering:
+  UTF-8 wide pipe yt-dlp slug (Khruangbin), 3-show franchise box-set
+  with double season range and parens-wrapped tech (Deutschland 83-86-89,
+  captures `group=S03` misdetection), accented chars in title (Chérie
+  BéBé with VFF), 8-word stand-up comedy title (Jimmy Carr), site-tag
+  prefix + XviD (OxTorrent), episode title + air-date silently lost
+  (Prodiges), full-chaos apostrophe + spaces + Blu-ray dash + 1080i +
+  multi-word audio codec (The Prodigy, full AI-path degeneration),
+  yt-dlp YouTube ID glued to year (Sleaford Mods), bilingual `[FR-EN]`
+  tag mistaken for group (Super Mario Bros), COMPLETE + S01-S07 range +
+  REPACK + HEVC (Gilmore Girls, the well-behaved exception).
   Parametrized over `tests/domain/test_release_fixtures.py` for anti-regression.
 - **`NxNN` alt season/episode form supported** by `parse_release`. Releases like
   `Show.1x05.720p.HDTV.x264-GRP` and `Show.2x07x08.1080p.WEB.x265-GRP` (multi-ep