{"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-pibj7pvy","versions":[{"created_at":"2026-06-10T18:46:54Z","element_count":83,"note":"5軸GA polish 59->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9a21d8ded2f79d1d549198a36b665cddf19430448d21db35c9e61b6b3e9647a4","version":3}]}