{"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-0czxnwzd","versions":[{"created_at":"2026-06-13T14:35:20Z","element_count":84,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"48b819cd3074574a60da5e2cca85383b6fd57eead2550c6c85eb4c6c48f26227","version":3},{"created_at":"2026-06-13T14:24:51Z","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":"94e4b604ccf769dd210645485b2785a03d4568440fbd75845d26373552670de6","version":2},{"created_at":"2026-06-13T14:24:48Z","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}]}