{"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-prrhfnh2","versions":[{"created_at":"2026-06-22T19:39:46Z","element_count":73,"note":"5軸GA polish 42->92 by M5 (autonomous)","saved_by":"mcp","sha256":"1663f642f7c3ff9bc7b087102b3715945c6b8a480fbb42ee87969f099fc764b1","version":3},{"created_at":"2026-06-22T19:32:39Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d170c904a07218c025cf3191e5e755b9c5086c77f7da72e46dcf45b2bf5056df","version":2},{"created_at":"2026-06-22T19:32:38Z","element_count":101,"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}]}