fix(release/parser): drop pure-punctuation TITLE tokens at assembly

Releases using ' - ' as a separator (Vinyl - 1x01 - FHD) tokenize to
['Vinyl', '-', '1x01', '-', 'FHD'] — the standalone '-' tokens were
ending up in title_parts and leaked into the joined title
('Vinyl.-'). We can't add '-' to the separator list (it would break
codec-GROUP), so we filter at assembly: a TITLE token with no
alphanumeric characters carries no title content.

Side win: same logic eliminates the UTF-8 wide-pipe '｜' from the
khruangbin_yt_wide_pipe fixture title.

Fixtures updated:
- shitty/vinyl_1x01_format/expected.yaml (title: Vinyl.- → Vinyl)
- path_of_pain/khruangbin_yt_wide_pipe/expected.yaml (｜ dropped)

tests/fixtures/releases/shitty/vinyl_1x01_format/expected.yaml

@@ -1,11 +1,12 @@
 release_name: "Vinyl - 1x01 - FHD"
 
-# Tech debt: surrounding ' - ' separators leave a stray '-' token attached
-# to the title ("Vinyl.-"). NxNN form correctly identifies S01E01; everything
-# tech-side empty (no quality token in KB — "FHD" not yet known). Anti-regression
-# the current degenerate title so a future fix is intentional.
+# Surrounding ' - ' separators in human-friendly release names left stray
+# '-' tokens attached to the title. They are now dropped at assembly time
+# (pure-punctuation TITLE tokens carry no content). NxNN form correctly
+# identifies S01E01; tech-side stays empty (no quality token in KB — "FHD"
+# not yet known).
 parsed:
-  title: "Vinyl.-"
+  title: "Vinyl"
   year: null
   season: 1
   episode: 1