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)

CHANGELOG.md

@@ -23,6 +23,12 @@ callers).
   with intermediate values implied. Fixture
   `shitty/archer_multi_episode/` updated from anti-regression-of-bug
   to anti-regression-of-fix.
+- **Pure-punctuation TITLE tokens are dropped at assembly.** Releases
+  with surrounding ` - ` separators (`Vinyl - 1x01 - FHD`) previously
+  produced `title="Vinyl.-"`. Such tokens (a stray dash, a wide pipe
+  `｜`, …) carry no title content and are now filtered out. Side
+  effect: PoP fixture `khruangbin_yt_wide_pipe/` also benefits — the
+  YouTube wide-pipe no longer leaks into the title.
 
 ### Added