Add file-path display helper import boundary guard

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

Author: cursoragent

CONTRIBUTING.md

@@ -133,6 +133,7 @@ This runs lint, format checks, compile checks, tests, and package build.
   - `tests/test_extension_request_internal_reuse.py` (extension request-helper internal reuse of shared model request helpers),
   - `tests/test_extension_route_constants_usage.py` (extension manager route-constant usage enforcement),
   - `tests/test_extract_payload_helper_usage.py` (extract start-payload helper usage enforcement),
+  - `tests/test_file_path_display_helper_import_boundary.py` (shared file-path display helper import boundary enforcement),
   - `tests/test_file_path_display_helper_usage.py` (shared file-path display helper usage enforcement),
   - `tests/test_guardrail_ast_utils.py` (shared AST guard utility contract),
   - `tests/test_helper_transport_usage_boundary.py` (manager-helper transport usage boundary enforcement through shared model request helpers),

tests/test_architecture_marker_usage.py

@@ -50,6 +50,7 @@
     "tests/test_model_request_wrapper_internal_reuse.py",
     "tests/test_tool_mapping_reader_usage.py",
     "tests/test_display_helper_usage.py",
+    "tests/test_file_path_display_helper_import_boundary.py",
     "tests/test_file_path_display_helper_usage.py",
     "tests/test_binary_file_open_helper_usage.py",
     "tests/test_browser_use_payload_helper_usage.py",

tests/test_file_path_display_helper_import_boundary.py

@@ -0,0 +1,39 @@
+import ast
+from pathlib import Path
+
+import pytest
+
+pytestmark = pytest.mark.architecture
+
+
+EXPECTED_FORMAT_FILE_PATH_IMPORTERS = (
+    "hyperbrowser/client/managers/extension_create_utils.py",
+    "hyperbrowser/client/managers/session_upload_utils.py",
+    "tests/test_file_utils.py",
+)
+
+
+def _imports_format_file_path_for_error(module_text: str) -> bool:
+    module_ast = ast.parse(module_text)
+    for node in module_ast.body:
+        if not isinstance(node, ast.ImportFrom):
+            continue
+        if any(alias.name == "format_file_path_for_error" for alias in node.names):
+            return True
+    return False
+
+
+def test_format_file_path_for_error_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 _imports_format_file_path_for_error(module_text):
+            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 _imports_format_file_path_for_error(module_text):
+            discovered_modules.append(module_path.as_posix())
+
+    assert discovered_modules == list(EXPECTED_FORMAT_FILE_PATH_IMPORTERS)