{"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-brecknocklodgehouse-htb51msd","versions":[{"created_at":"2026-08-14T19:52:32Z","element_count":85,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"850dcc84341a1548778580dad1aa351cb61b5c6ebd0fd1f86187f06ce43de903","version":2},{"created_at":"2026-08-14T19:52:27Z","element_count":85,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}