US07-01: Complete Donor Migration and Freeze the CLI Archive (#83)

tests/integration/test_safety_parity.py

@@ -3,6 +3,8 @@ same fixture files (real exiftool-written keywords)."""
 
 import shutil
 import subprocess
+import sys
+from pathlib import Path
 
 import numpy as np
 import pytest
@@ -11,6 +13,10 @@ from PIL import Image
 from photo_pipeline.integrations import exiftool
 from photo_pipeline.services import safety
 
+# The donor is frozen in the read-only archive (US07-01); parity still compares
+# against it, so this suite is the second and last place that may import it.
+ARCHIVED_SOURCES = Path(__file__).resolve().parents[2] / "legacy_cli_archive" / "src"
+
 EXIFTOOL = shutil.which("exiftool")
 pytestmark = pytest.mark.skipif(EXIFTOOL is None, reason="exiftool not installed")
 
@@ -31,6 +37,7 @@ def _tag(path, keyword):
 
 
 def test_extracted_marks_and_partition_match_donor(tmp_path):
+    sys.path.insert(0, str(ARCHIVED_SOURCES))  # the donor lives in the archive now
     donor_exif = pytest.importorskip("nsfwtag.exif")
 
     nsfw = _jpeg(tmp_path / "nsfw.jpg", 1)