{"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-ff4ic9cx","versions":[{"created_at":"2026-08-01T19:29:57Z","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":"60997470f2c04d67d8695a193b13cd280ff481c445b91849024234fa608ad7a5","version":2},{"created_at":"2026-08-01T19:29:57Z","element_count":126,"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}]}