fix: build_yaml_code_coverage_v1 Temp 디렉토리 없을 때 FileNotFoundError 수정

CI checkout에 Temp/ 디렉토리가 없어서 json 출력 실패.
write_text 전에 mkdir(parents=True) 추가.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/build_yaml_code_coverage_v1.py

@@ -161,6 +161,7 @@ def main() -> int:
         "rows": rows,
     }
 
+    out_path.parent.mkdir(parents=True, exist_ok=True)
     out_path.write_text(json.dumps(result, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
     print(
         f"[YAML_TO_CODE_COVERAGE_V1] total={len(all_spec_ids)} "