{"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-e4p2xeoy","versions":[{"created_at":"2026-06-11T01:39:31Z","element_count":90,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a9915edc0557f8ebab3412f70193d27318d9c111e482dff28382828ffc86921e","version":9},{"created_at":"2026-06-10T23:26:08Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c4ce82ebf728abb3b1c9657e6765a82356d766e39835933b77b5612cab6bc237","version":2}]}