Add comprehensive tests for ast-grep and tree-sitter relationship extraction

- Introduced test suite for AstGrepPythonProcessor covering pattern definitions, parsing, and relationship extraction.
- Added comparison tests between tree-sitter and ast-grep for consistency in relationship extraction.
- Implemented tests for ast-grep binding module to verify functionality and availability.
- Ensured tests cover various scenarios including inheritance, function calls, and imports.

ccw/frontend/src/lib/utils.ts

@@ -14,4 +14,20 @@ export function cn(...inputs: ClassValue[]): string {
   return twMerge(clsx(inputs));
 }
 
+/**
+ * Safely parse memory metadata from string, object, or undefined.
+ * Returns an empty object on parse failure or missing input.
+ */
+export function parseMemoryMetadata(
+  metadata: string | Record<string, any> | undefined | null
+): Record<string, any> {
+  if (!metadata) return {};
+  if (typeof metadata === 'object') return metadata;
+  try {
+    return JSON.parse(metadata);
+  } catch {
+    return {};
+  }
+}
+
 export type { ClassValue };