fix(node): stop a numbered saga all matching its first film

Every "<Saga> Episode <N> - <subtitle>" file in a numbered franchise
resolved to the series' first entry (a real, older film). `sequel_variants`
stripped "Episode <N>" and offered the bare "<Saga>" as a candidate query;
that matches the first film's original_title at ratio 1.0 and beat PASS 1's
correct-but-lower hit. A franchise's bare name is very often a real,
different film.

When a Part/Episode/Chapitre/… keyword carried the index, sequel_variants
no longer emits the bare base — only "<base> <digit>" and "<base> <roman>".
Without a keyword ("<Franchise> 3") the bare base is still offered, so that
fix is untouched. Verified live against TMDB: the franchise's episodes each
resolve to their own entry; the earlier numbered-sequel, two-part-film and
franchise-subtitle regressions all hold.

docs/mediacenter.md §10.3.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018BMLQjqFGCize2KtNBT79v

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