chore: snapshot current project updates

tests/test_scanner.py

@@ -1,6 +1,7 @@
 """Unit tests for the inventory scanner module."""
 
 import os
+import threading
 import tempfile
 import time
 import csv
@@ -286,6 +287,34 @@ class TestScanLibrary:
         assert result == []
         assert progress_events == [(0, 0)]
 
+    def test_scan_metadata_parallelism_uses_multiple_threads(self, tmp_path):
+        """Metadata scan should use worker threads when concurrency > 1."""
+        config = Config(library_root=tmp_path, enrichment_max_concurrency=4)
+        fake_paths = [tmp_path / f"f{i}.mp4" for i in range(8)]
+        thread_ids: set[int] = set()
+        lock = threading.Lock()
+
+        def _fake_create(file_path, library_root, categories_config, include_video_metadata=True, metadata_cache=None):
+            time.sleep(0.01)
+            with lock:
+                thread_ids.add(threading.get_ident())
+            return VideoFile(
+                path=file_path,
+                filename=file_path.name,
+                size_bytes=1,
+                modified_timestamp=datetime.now(timezone.utc),
+                category="movie",
+            )
+
+        with patch("vlm.scanner._discover_video_paths", return_value=fake_paths), patch(
+            "vlm.scanner._create_video_file",
+            side_effect=_fake_create,
+        ):
+            result = scan_library(tmp_path, config, include_video_metadata=True)
+
+        assert len(result) == len(fake_paths)
+        assert len(thread_ids) > 1
+
 
 class TestCategorizeFile:
     """Tests for the categorize_file function."""