Stop the respelled no-op row claiming 1.4 parity (#367)

This PR respelled titled_ambiguous_particle_no_op_chain from "Dr. Van
Jr." to "Do Van Jr." so it would still reach the chain loop's j > k + 1
guard -- a plain title is transparent now, so the old spelling never
gets there. The row kept its default `parity` classification through
the respelling, and the new text does not hold parity:

    1.4.0        first='Do Van'  last='Jr.'
    this branch  title='Do'  given='Van'  suffix='Jr.'

cases.py's own header says changing a row means changing its
classification, and the respelling is this PR's doing even though the
divergence is not: 'do' being a title and 'Jr.' routing to suffix are
both 2.0-era, so neither belongs to #367. Classified `fix` rather than
a specific slug because there are two independent causes, and the note
now records what they are so the next reader does not have to
re-measure 1.4.0 to find out.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: derek73

tests/v2/cases.py

@@ -201,8 +201,13 @@ def __post_init__(self) -> None:
                "loop skips it without ever reaching the no-op. 'Do' is "
                "a title AND a particle, which stops the transparency "
                "scan, so the chain does fire on Van and the j > k + 1 "
-               "guard is what declines it -- the same output, reached "
-               "through the branch the row exists to pin"),
+               "guard is what declines it -- the same reading of the "
+               "name, reached through the branch the row exists to pin. "
+               "Not parity, and not #367's doing either: 1.4.0 reads "
+               "'Do Van Jr.' as first 'Do Van', last 'Jr.', so the "
+               "divergence is 2.0's suffix routing plus 'do' being a "
+               "title -- both older than this row's respelling",
+         classification="fix"),
     Case("initial_shaped_not_conjunction", "john e. smith",
          {"given": "john", "middle": "e.", "family": "smith"},
          notes="v1 is_conjunction excludes initials at classify too"),