refactor(exam): SKILL 中文化，增加用户确认阶段，默认子代理分批处理

exam/scripts/validate_and_merge.json

@@ -0,0 +1,26 @@
+[
+  {
+    "tool_name": "execute_shell_command",
+    "arguments": {
+      "command": "python3 ${args.skill_dir}/scripts/validate.py ${args.generated_file}"
+    }
+  },
+  {
+    "tool_name": "execute_shell_command",
+    "arguments": {
+      "command": "python3 ${args.skill_dir}/scripts/merge_questions.py '${args.topics_dir}/${args.group}/${args.subtopic}/${args.question_type}.json' ${args.generated_file} /tmp/exam_merged.json"
+    }
+  },
+  {
+    "tool_name": "execute_shell_command",
+    "arguments": {
+      "command": "cp /tmp/exam_merged.json '${args.topics_dir}/${args.group}/${args.subtopic}/${args.question_type}.json'"
+    }
+  },
+  {
+    "tool_name": "execute_shell_command",
+    "arguments": {
+      "command": "python3 ${args.skill_dir}/scripts/update_meta.py ${args.topics_dir} ${args.group} ${args.subtopic} ${args.question_type}"
+    }
+  }
+]