{"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-y1903v9j","versions":[{"created_at":"2026-06-13T15:02:27Z","element_count":84,"note":"5軸GA polish 41->94 by M5 (autonomous)","saved_by":"mcp","sha256":"0d9be66308d5e51464bfb06949781c7ed82368d62b90b5103bc8e150f6d4b571","version":3},{"created_at":"2026-06-13T14:47:48Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"55af03a96feabc54a40e0d71c06deca0aa7b50a908b1ced17bc155003d4c027f","version":2},{"created_at":"2026-06-13T14:47:48Z","element_count":86,"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}]}