{"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-jb1c02sg","versions":[{"created_at":"2026-06-11T00:31:43Z","element_count":83,"note":"5軸GA polish 41->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d30a060357beba1861732f193ddda469f82378161212bc4e4fadb24468124ad8","version":15},{"created_at":"2026-06-10T21:52:34Z","element_count":47,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cb38a7789936fe25f1c8e5740315a82bd6d7ecc361cd9d15429ac03073635f08","version":2}]}