fix: isolate additional test files from production asset registry

- Fix test_issue_144_auto_discovery_workspace.py to use isolated test workspace
- Fix test_issue_144_asset_optimization.py to use isolated test workspace
- Ensure all AssetManager instances use test-specific registry paths
- Prevent additional test artifacts from contaminating production registry

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_issue_144_asset_optimization.py

@@ -8,8 +8,6 @@ Issue #144: Phase 3 - Advanced Features and Performance
 """
 
 import pytest
-import tempfile
-import shutil
 from pathlib import Path
 from unittest.mock import Mock, patch, MagicMock
 import json
@@ -21,6 +19,7 @@ from markitect.assets.optimizer import AssetOptimizer, OptimizationProfile, Opti
 from markitect.assets.optimizer import AssetTransformer as OptimizerTransformer
 from markitect.assets.transformer import AssetTransformer, ThumbnailGenerator
 from markitect.assets.analyzer import ContentAnalyzer, SimilarityDetector, AssetMetricsCollector
+from tests.test_utils import create_test_workspace, get_test_asset_config
 
 
 class TestAssetOptimizationAndProcessing:
@@ -28,9 +27,9 @@ class TestAssetOptimizationAndProcessing:
 
     def setup_method(self):
         """Set up test environment with sample assets."""
-        self.temp_dir = tempfile.mkdtemp()
-        self.assets_dir = Path(self.temp_dir) / "assets"
-        self.test_files_dir = Path(self.temp_dir) / "test_files"
+        self.temp_dir = create_test_workspace("asset_optimization")
+        self.assets_dir = self.temp_dir / "assets"
+        self.test_files_dir = self.temp_dir / "test_files"
 
         self.assets_dir.mkdir()
         self.test_files_dir.mkdir()
@@ -39,11 +38,14 @@ class TestAssetOptimizationAndProcessing:
         self.create_test_images()
         self.create_test_documents()
 
-        self.asset_manager = AssetManager(storage_path=self.assets_dir)
+        # Use test asset configuration to ensure isolated registry
+        config = get_test_asset_config(self.temp_dir)
+        self.asset_manager = AssetManager(config)
 
     def teardown_method(self):
         """Clean up temporary directories."""
-        shutil.rmtree(self.temp_dir)
+        import shutil
+        shutil.rmtree(self.temp_dir, ignore_errors=True)
 
     def create_test_images(self):
         """Create test images with various properties."""

tests/test_issue_144_auto_discovery_workspace.py

@@ -8,8 +8,6 @@ Issue #144: Phase 3 - Advanced Features and Performance
 """
 
 import pytest
-import tempfile
-import shutil
 from pathlib import Path
 from unittest.mock import Mock, patch, MagicMock
 import json
@@ -19,6 +17,7 @@ from markitect.assets import AssetManager
 from markitect.assets.discovery import AssetDiscoveryEngine, MarkdownScanner, AssetReference
 from markitect.workspace import WorkspaceManager, WorkspaceTemplate
 from markitect.assets.analytics import AssetAnalytics, UsageReport
+from tests.test_utils import create_test_workspace, get_test_asset_config
 
 
 class TestAutoDiscoveryAndWorkspace:
@@ -26,8 +25,8 @@ class TestAutoDiscoveryAndWorkspace:
 
     def setup_method(self):
         """Set up test environment with sample markdown files and workspace."""
-        self.temp_dir = tempfile.mkdtemp()
-        self.project_dir = Path(self.temp_dir) / "test_project"
+        self.temp_dir = create_test_workspace("auto_discovery")
+        self.project_dir = self.temp_dir / "test_project"
         self.assets_dir = self.project_dir / "assets"
         self.docs_dir = self.project_dir / "docs"
 
@@ -38,11 +37,14 @@ class TestAutoDiscoveryAndWorkspace:
         self.create_test_markdown_files()
         self.create_test_assets()
 
-        self.asset_manager = AssetManager(storage_path=self.assets_dir)
+        # Use test asset configuration to ensure isolated registry
+        config = get_test_asset_config(self.temp_dir)
+        self.asset_manager = AssetManager(config)
 
     def teardown_method(self):
         """Clean up temporary directories."""
-        shutil.rmtree(self.temp_dir)
+        import shutil
+        shutil.rmtree(self.temp_dir, ignore_errors=True)
 
     def create_test_markdown_files(self):
         """Create test markdown files with various asset references."""