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/merge_questions.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""Merge new questions into an existing question file, deduplicating by ID.
+
+Usage:
+    python3 merge_questions.py <existing_file> <new_file> <output_file>
+
+If existing_file does not exist or is empty, treats it as having no questions.
+Outputs a JSON summary to stdout with counts.
+
+Exit codes: 0 = success, 1 = error, 2 = usage error.
+"""
+import json
+import sys
+from pathlib import Path
+
+
+def load_json(path: str) -> dict | None:
+    """Load JSON file, return None if missing or empty."""
+    p = Path(path)
+    if not p.exists() or p.stat().st_size == 0:
+        return None
+    with open(p, encoding="utf-8") as f:
+        return json.load(f)
+
+
+def merge(existing: dict | None, new_data: dict) -> dict:
+    """Merge new questions into existing, deduplicating by ID."""
+    existing_questions = (existing or {}).get("questions", [])
+    new_questions = new_data.get("questions", [])
+
+    existing_ids = {q["id"] for q in existing_questions}
+    added = [q for q in new_questions if q["id"] not in existing_ids]
+    skipped = len(new_questions) - len(added)
+    merged = existing_questions + added
+
+    # Use new_data as base, replace questions with merged
+    result = dict(new_data)
+    result["questions"] = merged
+
+    return result, {
+        "existing_count": len(existing_questions),
+        "new_count": len(new_questions),
+        "added_count": len(added),
+        "skipped_count": skipped,
+        "total_count": len(merged),
+    }
+
+
+def main():
+    if len(sys.argv) != 4:
+        print(f"Usage: {sys.argv[0]} <existing_file> <new_file> <output_file>",
+              file=sys.stderr)
+        sys.exit(2)
+
+    existing_path = sys.argv[1]
+    new_path = sys.argv[2]
+    output_path = sys.argv[3]
+
+    existing = load_json(existing_path)
+
+    try:
+        with open(new_path, encoding="utf-8") as f:
+            new_data = json.load(f)
+    except (FileNotFoundError, json.JSONDecodeError) as e:
+        print(f"❌ Cannot read new questions file: {e}", file=sys.stderr)
+        sys.exit(1)
+
+    merged, stats = merge(existing, new_data)
+
+    with open(output_path, "w", encoding="utf-8") as f:
+        json.dump(merged, f, ensure_ascii=False, indent=2)
+
+    print(json.dumps(stats, ensure_ascii=False))
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()