{"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-hawthornhouse-g8br7260","versions":[{"created_at":"2026-08-20T15:57:26Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8215dde61f2fc7117ef19da155797e81b1bdd49240519d4fa84c056e6bfebeb1","version":2},{"created_at":"2026-08-20T15:57:25Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}