{"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-erg3nrxe","versions":[{"created_at":"2026-07-15T01:57:27Z","element_count":72,"note":"5軸GA polish 39->91 by M5 (autonomous)","saved_by":"mcp","sha256":"917ee6fe45b16a9a3491067036b27c03ee21a28737e92e94612dcf410b709fcf","version":3},{"created_at":"2026-07-15T01:47:01Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"237b5db494b710fe04728bdf26f333305e904743c112644a542a314d033c6754","version":2},{"created_at":"2026-07-15T01:47:01Z","element_count":119,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}