{"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-7aq7mbg4","versions":[{"created_at":"2026-06-30T06:43:55Z","element_count":89,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"c50f554edead406bd63b34663820871d08445488177f9ea5e1d66d2a094737b0","version":3},{"created_at":"2026-06-30T06:33:17Z","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":"bc4f710ac059badb2a4b75a049ba7597a44f6bdc238871aa2ae6acd465ba338d","version":2},{"created_at":"2026-06-30T06:33:17Z","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}]}