refactor default artifacts workspace and path compatibility

tests/test_config.py

@@ -20,6 +20,7 @@ class TestConfig:
         assert config.series_template == "series/{title}/Season {season:02d}/"
         assert config.log_level == "INFO"
         assert config.quarantine_dir == ".quarantine"
+        assert config.workspace_dir == Path("artifacts")
         assert config.enrichment_providers == ["tmdb"]
         assert config.plan_max_season == 15
         assert config.plan_max_episode == 100
@@ -80,6 +81,7 @@ class TestLoadConfig:
                 'series_filename': 'S{season:02d}E{episode:02d}{ext}'
             },
             'quarantine_dir': '.quarantine',
+            'workspace_dir': 'artifacts',
             'log_level': 'DEBUG',
             'plan': {
                 'duplicate_keep': 'by_quality',
@@ -100,6 +102,7 @@ class TestLoadConfig:
         assert config.series_template == 'series/{title}/Season {season:02d}/'
         assert config.log_level == 'DEBUG'
         assert config.quarantine_dir == '.quarantine'
+        assert config.workspace_dir == Path('artifacts')
         assert config.duplicate_keep == 'by_quality'
         assert config.plan_max_season == 12
         assert config.plan_max_episode == 80
@@ -192,6 +195,20 @@ class TestLoadConfig:
         assert ".mp4" in config.video_extensions
         assert config.movie_template == "movie/{title} ({year})/"
         assert config.log_level == "INFO"
+        assert config.workspace_dir == Path("artifacts")
+
+    def test_load_config_with_workspace_dir(self, tmp_path):
+        """Test loading config with explicit workspace_dir."""
+        config_file = tmp_path / "config.yaml"
+        config_data = {
+            'library_root': '/mnt/nas/videos',
+            'workspace_dir': 'work/artifacts'
+        }
+        with open(config_file, 'w') as f:
+            yaml.dump(config_data, f)
+
+        config = load_config(config_file)
+        assert config.workspace_dir == Path('work/artifacts')
 
     def test_load_config_with_custom_categories(self, tmp_path):
         """Test loading config with custom categories."""
@@ -282,6 +299,7 @@ class TestCreateDefaultConfig:
         assert 'templates' in data
         assert 'log_level' in data
         assert 'quarantine_dir' in data
+        assert 'workspace_dir' in data
         assert 'enrichment' in data
         assert 'enrich' in data
         assert 'plan' in data
@@ -308,6 +326,7 @@ class TestCreateDefaultConfig:
         # Configs should be equivalent
         assert loaded_config.library_root == created_config.library_root
         assert loaded_config.video_extensions == created_config.video_extensions
+        assert loaded_config.workspace_dir == created_config.workspace_dir
         assert loaded_config.movie_template == created_config.movie_template
         assert loaded_config.log_level == created_config.log_level
 
@@ -417,6 +436,15 @@ class TestValidateConfig:
         
         assert len(errors) > 0
         assert any("quarantine_dir" in err for err in errors)
+
+    def test_validate_workspace_dir_type(self):
+        """workspace_dir must be a Path object."""
+        config = Config(
+            library_root=Path("/mnt/nas/videos"),
+            workspace_dir="artifacts",  # type: ignore[arg-type]
+        )
+        errors = validate_config(config)
+        assert any("workspace_dir must be a Path object" in err for err in errors)
     
     def test_validate_multiple_errors(self):
         """Test validating config with multiple errors."""