{"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-fv0qr54h","versions":[{"created_at":"2026-06-11T01:38:46Z","element_count":90,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a9915edc0557f8ebab3412f70193d27318d9c111e482dff28382828ffc86921e","version":10},{"created_at":"2026-06-10T23:16:14Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"80d5b076adf1f6f94c273031010bcc3e1d898a553842bbc02d1a915fd6780789","version":2}]}