{"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-0txwyydz","versions":[{"created_at":"2026-07-03T06:27:36Z","element_count":71,"note":"5軸GA polish 42->93 by M5 (autonomous)","saved_by":"mcp","sha256":"312d4c90f1156fb683c69560ebc685a73e34098615ce6f6ae2840ca7fbede3cf","version":3},{"created_at":"2026-07-03T06:21:02Z","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":"821d41f43962bf84bff7fba295c44f885b2d27ada683bb712e6cb984b06b3df6","version":2},{"created_at":"2026-07-03T06:21:02Z","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}]}