feat(test): clean_baseline marker resets controller state before test

pyproject.toml

@@ -46,6 +46,7 @@ markers = [
     "clean_install: clean install verification (opt-in via RUN_CLEAN_INSTALL_TEST=1)",
     "docker: docker build and run test (opt-in via RUN_DOCKER_TEST=1)",
     "live: marks tests as live visualization tests (not in CI by default)",
+    "clean_baseline: opt-in marker that resets controller state via /api/reset_session before the test starts (FR5, Phase 6 of test_infrastructure_hardening_20260609)",
 ]
 
 [tool.mypy]

tests/conftest.py

@@ -653,6 +653,21 @@ def _check_live_gui_health(request, live_gui) -> Generator[None, None, None]:
   handle.ensure_alive()
  yield
 
+@pytest.fixture(autouse=True)
+def _reset_clean_baseline(request, live_gui) -> Generator[None, None, None]:
+ """[SDM: tests/conftest.py:_reset_clean_baseline] [C: tests marked with @pytest.mark.clean_baseline]"""
+ if request.node.get_closest_marker("clean_baseline"):
+  try:
+   from src.api_hook_client import ApiHookClient
+   client = ApiHookClient()
+   if client.wait_for_server(timeout=5):
+    client.reset_session()
+    time.sleep(0.2)
+  except Exception:
+   pass
+ yield
+
+
 @pytest.fixture
 def live_gui_workspace(live_gui) -> Path:
  """[SDM: tests/conftest.py:live_gui_workspace] [C: tests/test_rag_phase4_*.py, tests/test_saved_presets_sim.py, etc.]"""

tests/test_clean_baseline_marker.py

@@ -0,0 +1,34 @@
+"""Tests for the clean_baseline marker (Phase 6, FR5)."""
+import pytest
+import time
+
+
+def test_clean_baseline_marker_registered() -> None:
+ """The clean_baseline marker is registered in pyproject.toml."""
+ # This test will fail if the marker is not registered.
+ # We use pytest.mark.clean_baseline as a sentinel.
+ @pytest.mark.clean_baseline
+ def dummy() -> None:
+     pass
+ assert hasattr(dummy, "pytestmark")
+
+
+@pytest.mark.clean_baseline
+def test_clean_baseline_ai_input_empty_at_start(live_gui) -> None:
+ """A test marked with clean_baseline starts with empty ai_input."""
+ handle = live_gui
+ client = handle.api_client if hasattr(handle, "api_client") else None
+ if client is None:
+  # Fall back to creating a client
+  from src.api_hook_client import ApiHookClient
+  client = ApiHookClient()
+  assert client.wait_for_server(timeout=15)
+ value = client.get_value("ai_input")
+ assert value == "", f"Expected empty ai_input at start of clean_baseline test, got {value!r}"
+
+
+@pytest.mark.clean_baseline
+def test_clean_baseline_does_not_break_normal_tests(live_gui) -> None:
+ """A test marked with clean_baseline still runs normally."""
+ handle = live_gui
+ assert handle.is_alive()