fix: follow-up for salvaged PR #8939

- Move test file to tests/hermes_cli/ (consistent with test layout)
- Remove unused imports (os, pytest) from test file
- Update _sanitize_env_lines docstring: now used on read + write paths

tests/hermes_cli/test_env_sanitize_on_load.py

@@ -1,12 +1,9 @@
 """Tests for .env sanitization during load to prevent token duplication (#8908)."""
 
-import os
 import tempfile
 from pathlib import Path
 from unittest.mock import patch
 
-import pytest
-
 
 def test_load_env_sanitizes_concatenated_lines():
     """Verify load_env() splits concatenated KEY=VALUE pairs.