added ruff for code review

tests/test_render.py

@@ -76,11 +76,14 @@ requires_blender = pytest.mark.skipif(
 
 def _run_blender(script: Path, job: Path, timeout: int = 900) -> subprocess.CompletedProcess:
     assert BLENDER is not None
+    # check=False is deliberate: several tests assert on non-zero Blender exit
+    # codes (2/3), so a non-zero status is data, not an error to raise on.
     return subprocess.run(
         [str(BLENDER), "-b", str(SOURCE_BLEND), "-P", str(script), "--", "--job", str(job)],
         capture_output=True,
         text=True,
         timeout=timeout,
+        check=False,
     )
 
 
@@ -248,7 +251,7 @@ def test_job_carries_the_hard_render_settings(paths, settings, tmp_path):
     assert job["objects"] == {"mesh": "sensing_surface", "camera": "cam_sensor"}
     assert job["null_frame"] == {"name": REFERENCE_NULL_NAME, "seed": 1}
     assert job["artifacts"]["report"] == str(
-        (Path(tmp_path).resolve() / render.MANIFEST_FILENAME)
+        Path(tmp_path).resolve() / render.MANIFEST_FILENAME
     )
     assert job["artifacts"]["frames_npz"] == str(
         deform.probe_artifact_paths(Path(tmp_path))["frames"]