{"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-willowbrookhouse-rbyhl6er","versions":[{"created_at":"2026-07-24T11:50:02Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"abd39c1485ba8626c536d52f2bce6515ba8d4ee02b4b357a43fa8f14f08dc9d1","version":2},{"created_at":"2026-07-24T11:49:56Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}