{"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-pb8x0iqd","versions":[{"created_at":"2026-08-04T06:25:59Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e38940b4d195bd59a6eb22509bafecbbc9139496a4192597105d4841475e2674","version":2},{"created_at":"2026-08-04T06:25:59Z","element_count":85,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}