{"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-pptt3dyw","versions":[{"created_at":"2026-07-13T10:23:55Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d64d5705b7f16ce8a951b343ed5c2c856d2824a4044cd2e4d0ad287f9050c226","version":3},{"created_at":"2026-07-13T10:13:12Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"087f46d650521f973e77ceeb97bc8714413e1c741ed48816d4920b6703bfc520","version":2},{"created_at":"2026-07-13T10:13:12Z","element_count":130,"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}]}