fix(media): a TV plan that follows the authorities it was given

A dry run of the TV planner against the real 58k-file library produced a root
series called "01 NCOP" out of a bonus subfolder, copied Jellyfin's stale
numbering (every file under SNL 16-20/Season 16..19 carries season 16 episode
20; one Gundam row says season 2004), and lost subtitles a scene pack had
buried in Subs/<release-name>/.

- Folders now RESOLVE a series and never invent one: a folder's words match a
  registered name as a token run ("(CBB) Tengen Toppa Gurren Lagann - The
  Complete Series (BD 1080p)" names Tengen Toppa Gurren Lagann), and folder
  words alone name nothing, so an unknown pack's bonus folder parks instead of
  opening a new show at the library root.
- Numbering priority: the marker the file's own name states, then the Season NN
  folder plus the number the name leads with inside it, then the provider row.
  A row that still insists on season 1989 parks its file rather than creating
  Season 1989.
- The provider row keeps identity: the registered name and its year survive a
  file whose own marker numbers it, and the pack index a release leads with
  ("4a. Seed DESTINY") is folded out of the folder name.
- A sidecar searches every ancestor folder for the video it names, not just the
  parent, so Subs/<release-name>/<release>.jpn.srt follows its episode.
- The shared bonus-folder test no longer reads an index as a title: name_words
  drops "extras" as release junk, so "01. Extras" reduced to "01" and matched
  the "01" of "NCOP 01", cancelling the bonus evidence. Only words can name a
  film.

scripts/media-titles.py

@@ -275,7 +275,14 @@ def is_extra(path, title="", dur=0.0, root=ROOT, matched=False):
     bonus_folder = False
     for folder in parts[head:-1]:
         if folder_is_bonus(folder):
-            bonus_folder = not mentions(name_words(name), name_words(folder))
+            # The folder's words are often the film's own name ("Angel's Egg
+            # Extras/"), and then they are not bonus evidence. Only WORDS can name
+            # a film: "extras" is release junk that name_words drops, so a folder
+            # like "01. Extras" reduces to its index — and an index matching an
+            # index ("NCOP 01") is a coincidence, not a title.
+            nw = [w for w in name_words(name) if not w.isdigit()]
+            fw = [w for w in name_words(folder) if not w.isdigit()]
+            bonus_folder = not fw or not mentions(nw, fw)
             break
     if dur and dur > SHORT_MAX:
         # Runtime vetoes vocabulary, with ONE exception: an explicit bonus folder