{"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-om6pe4wp","versions":[{"created_at":"2026-06-27T15:52:02Z","element_count":73,"note":"5軸GA polish 44->96 by M5 (autonomous)","saved_by":"mcp","sha256":"4f5d5befd45dcd34fab643477f7fc83ad0c362040265fcb1380c9209b70dd434","version":3},{"created_at":"2026-06-27T15:41:12Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fabf41580d702f3c13b4b1a3cd07d4755ba4cc2c59bcd47a75981d0a31897110","version":2},{"created_at":"2026-06-27T15:41:11Z","element_count":105,"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}]}