refactor(verification): extract shared text_labels cell and hash codec

- Move inline _text_labels lists into a shared text_labels cell
- Replace inline np.packbits hash encoding with bits_tensor_to_hash_bytes
- Add static tests to verify notebook API usage patterns

tests/test_notebook_verification_static.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+NOTEBOOK = Path(__file__).resolve().parents[1] / "notebooks" / "verification.py"
+
+
+def test_verification_notebook_uses_scenegraph_query_api():
+    source = NOTEBOOK.read_text()
+
+    assert "query_image_against_scene_graph" in source
+    assert "text_labels=text_labels" in source
+
+
+def test_verification_notebook_uses_hash_codec_for_object_hashes():
+    source = NOTEBOOK.read_text()
+
+    assert "bits_tensor_to_hash_bytes" in source
+    assert "np.packbits" not in source