{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-cjez7tnw","versions":[{"created_at":"2026-06-10T18:46:54Z","element_count":74,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f80896b66e9dbc5faccd1bf7cdc785b6272f41e6e93edbe3d3cec6ddd274c87e","version":3}]}