test: retry the flaky cancel-with-discard integration test

pyproject.toml

@@ -68,6 +68,7 @@ test = [
     "pytest-asyncio>=0.23",
     "playwright>=1.40",                    # E2E browser automation against http://127.0.0.1:<port> (Backend §4.10.3)
     "pytest-cov>=4.1",                     # Coverage reporting; configured under [tool.coverage.run]
+    "pytest-rerunfailures>=14",            # Opt-in retries for timing-sensitive flakes (@pytest.mark.flaky)
     # httpx is already in core deps -- used for AsyncClient(app=app) in integration tests too
 ]
 

tests/integration/controller/test_creation_flow.py

@@ -492,6 +492,11 @@ def get_record(self, name: str) -> PluginRecord | None:
 # ---------------------------------------------------------------------------
 
 
+# Timing-sensitive: this test races the creation pipeline against a mid-flight
+# cancel (it polls with ``asyncio.sleep`` and branches on whether the dir landed
+# first). Under load the race can occasionally lose; retry rather than fail the
+# suite on a transient timing miss.
+@pytest.mark.flaky(reruns=3, reruns_delay=0.5)
 async def test_cancel_with_discard_files_removes_partial_dir(tmp_path: Path) -> None:
     """A cancel with ``discard_files=True`` deletes the partial directory."""
     local_root = tmp_path / "data"