{"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-i04nttnj","versions":[{"created_at":"2026-08-02T17:37:36Z","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":"4aa13466d3575f0fb2357679526830737b3dc091e3bb6f7320bbab5f00225e86","version":2},{"created_at":"2026-08-02T17:37:36Z","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}]}