fix: Correct fixture name in test_bootstrap_skill.py

Changed _tmp_path to tmp_path to fix pytest fixture error:
- Line 54: test_bootstrap_script_runs fixture parameter

Error was:
  fixture '_tmp_path' not found
  available fixtures: ..., tmp_path, ...

This was causing 1 ERROR in CI test runs across all Python versions.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_bootstrap_skill.py

@@ -51,7 +51,7 @@ class TestBootstrapSkillScript:
         assert "description:" in content, "Header must have description"
 
     @pytest.mark.slow
-    def test_bootstrap_script_runs(self, project_root, _tmp_path):
+    def test_bootstrap_script_runs(self, project_root, tmp_path):
         """Test that bootstrap script runs successfully.
 
         Note: This test is slow as it runs full codebase analysis.