{"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-v4gnkq2q","versions":[{"created_at":"2026-07-20T19:38:55Z","element_count":91,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"c51fa62f903e049aa953ebd6620c491488212f2691e770081a17a5a82df4464a","version":3},{"created_at":"2026-07-20T19:35:30Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"87a9e3f55696c52048f2fd4c73ec58b977dc00aae24f216f121b3c697ae0aa45","version":2},{"created_at":"2026-07-20T19:35:29Z","element_count":119,"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}]}