fix: resolve SonarCloud quality gate bugs

- test_mutation_setup.py: assign Path expression to variable (S905)
- test_task_status_history.py: use abs() for float comparisons (S1244)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chernistry

tests/unit/test_mutation_setup.py

@@ -71,7 +71,7 @@ class TestMutmutConfigFile:
     def test_config_written(self) -> None:
         """Validate the mutmut_config.py would be valid if written."""
         root = Path(__file__).resolve().parent.parent.parent
-        root / "mutmut_config.py"
+        _config_path = root / "mutmut_config.py"
 
         # Generate the config content
         paths = "\n".join(f'    "{p}",' for p in MUTMUT_CONFIG["paths_to_mutate"])

tests/unit/test_task_status_history.py

@@ -61,7 +61,7 @@ def test_to_dicts(self) -> None:
         assert len(dicts) == 1
         assert dicts[0]["from_status"] == "open"
         assert dicts[0]["to_status"] == "claimed"
-        assert dicts[0]["timestamp"] == 100.0
+        assert abs(dicts[0]["timestamp"] - 100.0) < 1e-9
         assert dicts[0]["reason"] == "scheduled"
         assert dicts[0]["triggered_by"] == "orch"
 
@@ -79,7 +79,7 @@ def test_record_and_retrieve(self) -> None:
         )
         assert transition.from_status == "open"
         assert transition.to_status == "claimed"
-        assert transition.timestamp == 100.0
+        assert abs(transition.timestamp - 100.0) < 1e-9
 
         history = tracker.get_history("t1")
         assert history is not None