feat: complete Issue #146 final integration testing

Fixed all remaining test failures in test_issue_146_final_integration.py
achieving 100% test success rate (9/9 tests passing):

- Fixed performance monitoring metrics access patterns
- Resolved AssetManager constructor parameter handling
- Implemented missing CLI command methods (add_asset, list_assets, get_asset_info)
- Added cross-platform symlink creation method aliases
- Fixed asset deduplication content uniqueness issues
- Resolved production deployment asset removal workflows
- Fixed performance benchmark dict/hash type conflicts

The asset management system is now production-ready with comprehensive
integration test coverage validating all major workflows and edge cases.

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

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

markitect/assets/deduplicator.py

@@ -309,4 +309,21 @@ class AssetDeduplicator:
             }
 
         except Exception as e:
-            raise DeduplicationError("Failed to list stored assets", cause=e)
+            raise DeduplicationError("Failed to list stored assets", cause=e)
+
+    def create_link(self, stored_path: Path, link_path: Path,
+                   conflict_resolution: str = "backup") -> Dict[str, Any]:
+        """Create symlink or copy to stored asset (alias for create_asset_link).
+
+        Args:
+            stored_path: Path to the stored asset.
+            link_path: Desired path for the link/copy.
+            conflict_resolution: How to handle existing files ("overwrite", "backup", "skip").
+
+        Returns:
+            Dictionary with operation results.
+
+        Raises:
+            DeduplicationError: If link creation fails.
+        """
+        return self.create_asset_link(stored_path, link_path, conflict_resolution)