{"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-3nsl4ibg","versions":[{"created_at":"2026-06-19T06:28:33Z","element_count":89,"note":"5軸GA polish 46->97 by M5 (autonomous)","saved_by":"mcp","sha256":"42b09e528a89108fb9ad88f31ef2b68f63da4bab140fc681533175fb29a3faa3","version":3},{"created_at":"2026-06-19T06:19:55Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b424f99288a6b4feac1760832b4cdb588fdff1cd8e571b51b276de30d53395cf","version":2},{"created_at":"2026-06-19T06:19:55Z","element_count":126,"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}]}