style: fix linting errors in test assertions

Replace equality comparisons to False with 'not' for better style.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: phernandez <paul@basicmachines.co>

Author: phernandez

tests/repository/test_search_repository.py

@@ -574,13 +574,13 @@ def test_parenthetical_term_quote_escaping(self, search_repository):
     def test_needs_quoting_empty_input(self, search_repository):
         """Test _needs_quoting with empty inputs (line 207 coverage)."""
         # Test empty string
-        assert search_repository._needs_quoting("") == False
+        assert not search_repository._needs_quoting("")
 
         # Test whitespace-only string
-        assert search_repository._needs_quoting("   ") == False
+        assert not search_repository._needs_quoting("   ")
 
         # Test None-like cases
-        assert search_repository._needs_quoting("\t") == False
+        assert not search_repository._needs_quoting("\t")
 
     def test_prepare_single_term_empty_input(self, search_repository):
         """Test _prepare_single_term with empty inputs (line 227 coverage)."""