{"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-gentlehillbungalow-nzximgk7","versions":[{"created_at":"2026-08-20T15:59:24Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3fbf3d1149af50dcc0d15bb9c5f1a4174cf97801c96d613f0dcc74ad091b4e0b","version":2},{"created_at":"2026-08-20T15:59:24Z","element_count":134,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}