Address copilot nits

Author: steven10a

src/guardrails/checks/text/keywords.py

@@ -79,8 +79,8 @@ def _compile_pattern(keywords: tuple[str, ...]) -> re.Pattern[str]:
     for keyword in keywords:
         escaped = re.escape(keyword)
         # Check first and last character of the original keyword for word character status
-        starts_with_word_char = keyword and keyword[0].isalnum() or (keyword and keyword[0] == "_")
-        ends_with_word_char = keyword and keyword[-1].isalnum() or (keyword and keyword[-1] == "_")
+        starts_with_word_char = keyword and (keyword[0].isalnum() or keyword[0] == "_")
+        ends_with_word_char = keyword and (keyword[-1].isalnum() or keyword[-1] == "_")
 
         prefix = r"(?<!\w)" if starts_with_word_char else ""
         suffix = r"(?!\w)" if ends_with_word_char else ""

tests/unit/checks/test_keywords.py

@@ -191,6 +191,6 @@ def test_match_keywords_mixed_punctuation_and_word_chars() -> None:
     result = match_keywords("test@user@test", config, guardrail_name="Test Guardrail")
     assert result.tripwire_triggered is True  # noqa: S101
 
-    # Should not match when word chars continue into the keyword
+    # Should match even when followed by more text (no boundaries applied to punctuation edges)
     result = match_keywords("test@user@more", config, guardrail_name="Test Guardrail")
     assert result.tripwire_triggered is True  # noqa: S101