fix: resolve linting and IO review feedback

Author: selamw1

scripts/qa_report.py

@@ -33,6 +33,7 @@
 from a2ui.schema.common_modifiers import remove_strict_validation
 from a2ui.schema.constants import VERSION_0_9
 
+
 def run_validation():
     print(f"Starting QA Validation against A2UI v{VERSION_0_9}...")
 
@@ -113,10 +114,9 @@ def run_validation():
             catalog = manager.get_selected_catalog()
 
             for filename in sorted(os.listdir(examples_dir)):
-                if not filename.endswith(".json"):
-                    continue
-                    
                 filepath = examples_dir / filename
+                if not filepath.is_file() or not filename.endswith(".json"):
+                    continue
                 total_examples += 1
 
                 try:
@@ -127,7 +127,8 @@ def run_validation():
                     report_content.append(f"- ✅ `{filename}`: Passed")
                     passed_examples += 1
                 except Exception as e:
-                    err_str = str(e).replace('\n', ' ')
+                    err_msg = getattr(e, 'message', str(e))
+                    err_str = str(err_msg).replace('\n', ' ')
                     report_content.append(f"- ❌ `{filename}`: Failed ({err_str})")
                     failed_examples.append(f"{sample_name}/{filename}")
 
@@ -146,7 +147,7 @@ def run_validation():
     report_content.append(f"- **Failed:** {len(failed_examples)}")
 
     report_str = "\n".join(report_content)
-    with open(report_path, "w") as f:
+    with open(report_path, "w", encoding="utf-8") as f:
         f.write(report_str)
 
     print(f"\nQA Report generated at: {report_path}")
@@ -158,5 +159,6 @@ def run_validation():
         print("Validation finished successfully.")
         sys.exit(0)
 
+
 if __name__ == "__main__":
     run_validation()