fix(video): group every episode under the show's own folder, not a per-file guessit title

The mechanism itself was wrong, not just the TMDB matching: a bare episode
numbering convention with no show name in the filename at all
(`001    Episode's Own Title.ext`, no SxxExx, no show prefix — entirely
ordinary on its own) makes guessit invent a "title" from whatever text
follows the number. That text is the individual episode's own name, and
differs for every episode in the folder — trusting it, as the code did,
groups nothing together at all: every episode became its own single-
episode "show", searched against TMDB by that one-off title alone.

Whenever a season-like ancestor folder exists (a numbered season, or
Specials/Bonus/Extras -> season 0), its own root folder now names the show
unconditionally — never a per-file guessit title, which cannot tell a
show's real name from an individual episode's one-off name when the
filename carries no reliable ShowName/SxxExx structure. The walk continues
past *every* consecutive season-like ancestor, not just the first: a
per-season Bonus folder (Show/Season N/Bonus/file.ext) is nested two
levels inside the show, both "Bonus" and "Season N" season-like on their
own, and stopping at the first would hand back "Season N" as the show's
name instead of "Show".

Also adds "livre" ("book") to the season-word vocabulary (§3.4) — some
shows number their seasons that way (Roman numerals) rather than
"season"/"saison".

Supersedes _title_from_show_siblings from the previous commit (removed):
that fallback assumed a per-file title could still be trusted often
enough to be worth borrowing from a sibling season folder — this fix
means it never needs trusting in the first place once a season-like
ancestor exists.

Verified directly against the real library this was found on, not just
synthetic tests: every sample file (a numbered episode, a Book/Bonus
feature, a Book-root "making of") now resolves to the show's real name.

1 files changed, 4 insertions, 2 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
index 5203247..0baf34f 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/title_parse.py
@@ -36,8 +36,10 @@ _EDITION_RE = re.compile("|".join(_EDITION_PHRASES), re.IGNORECASE)
 
 # A season-like ancestor folder: the English/French words plus a number or
 # Roman numeral. Vocabulary is a plain tuple so a deployment can extend it
-# per locale without touching the regex-building logic.
-SEASON_WORDS = ("season", "saison")
+# per locale without touching the regex-building logic. "livre" ("book") is
+# real, observed vocabulary too — some shows name their seasons that way
+# (Roman numerals: "Livre I".."Livre VI") rather than "saison".
+SEASON_WORDS = ("season", "saison", "livre")
 _SEASON_RE = re.compile(
     r"(?:" + "|".join(SEASON_WORDS) + r")\s*([0-9]+|[ivxlc]+)\b",
     re.IGNORECASE,