Add list parsing helper import boundary guard

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

CONTRIBUTING.md

@@ -168,6 +168,7 @@ This runs lint, format checks, compile checks, tests, and package build.
   - `tests/test_job_wait_helper_boundary.py` (centralization boundary enforcement for wait-for-job helper primitives),
   - `tests/test_job_wait_helper_usage.py` (shared wait-for-job defaults helper usage enforcement),
   - `tests/test_list_parsing_helper_usage.py` (list parsing shared helper usage centralization),
+  - `tests/test_list_parsing_helpers_import_boundary.py` (list parsing helper import boundary enforcement),
   - `tests/test_list_parsing_key_display_helper_usage.py` (list parsing safe key-display helper usage enforcement),
   - `tests/test_makefile_quality_targets.py` (Makefile quality-gate target enforcement),
   - `tests/test_manager_helper_import_boundary.py` (manager helper-import boundary enforcement for low-level parse modules),

tests/test_architecture_marker_usage.py

@@ -127,6 +127,7 @@
     "tests/test_job_request_helper_usage.py",
     "tests/test_job_start_payload_helper_usage.py",
     "tests/test_job_query_params_helper_usage.py",
+    "tests/test_list_parsing_helpers_import_boundary.py",
     "tests/test_list_parsing_key_display_helper_usage.py",
     "tests/test_list_parsing_helper_usage.py",
     "tests/test_job_wait_helper_boundary.py",

tests/test_list_parsing_helpers_import_boundary.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+
+import pytest
+
+pytestmark = pytest.mark.architecture
+
+
+EXPECTED_LIST_PARSING_HELPER_IMPORTERS = (
+    "hyperbrowser/client/managers/extension_utils.py",
+    "hyperbrowser/client/managers/session_utils.py",
+    "tests/test_list_parsing_helpers_import_boundary.py",
+    "tests/test_list_parsing_utils.py",
+)
+
+
+def test_list_parsing_helper_imports_are_centralized():
+    discovered_modules: list[str] = []
+
+    for module_path in sorted(Path("hyperbrowser").rglob("*.py")):
+        module_text = module_path.read_text(encoding="utf-8")
+        if "list_parsing_utils import" not in module_text:
+            continue
+        discovered_modules.append(module_path.as_posix())
+
+    for module_path in sorted(Path("tests").glob("test_*.py")):
+        module_text = module_path.read_text(encoding="utf-8")
+        if "list_parsing_utils import" not in module_text:
+            continue
+        discovered_modules.append(module_path.as_posix())
+
+    assert discovered_modules == list(EXPECTED_LIST_PARSING_HELPER_IMPORTERS)