{"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-m2wb9bwg","versions":[{"created_at":"2026-08-04T20:00:19Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9ff9c6a60ad36e539312ec4ca9726ddffe3589bcbd6457de58e4e53d4fdc51c0","version":2},{"created_at":"2026-08-04T20:00:15Z","element_count":107,"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}]}