Remove duplicate conjunction tests added in 155fb73

test_leading_conjunction_joins_to_following_piece and
test_trailing_conjunction_at_list_end were exact duplicates of the
pre-existing test_starts_with_conjunction and test_ends_with_conjunction
tests (same input, same assertions). They added no new coverage of the
join_on_conjunctions restructuring and only inflated the test file.

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

Author: derek73

tests/test_conjunctions.py

@@ -274,16 +274,3 @@ def test_conjunction_bridges_prefix_chain_with_multiple_conjunctions(self) -> No
         self.m(hn.first, "Alois", hn)
         self.m(hn.middle, "", hn)
         self.m(hn.last, "von und zu und von Liechtenstein", hn)
-
-    def test_leading_conjunction_joins_to_following_piece(self) -> None:
-        # exercises the i == 0 branch: conjunction is the very first piece
-        hn = HumanName("and Jon Dough")
-        self.m(hn.first, "and Jon", hn)
-        self.m(hn.last, "Dough", hn)
-
-    def test_trailing_conjunction_at_list_end(self) -> None:
-        # exercises the truncated rm_count path: conjunction is the last piece,
-        # so there is no following piece to remove
-        hn = HumanName("Jon Dough and")
-        self.m(hn.first, "Jon", hn)
-        self.m(hn.last, "Dough and", hn)