{"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-3apt3v2z","versions":[{"created_at":"2026-06-19T19:39:01Z","element_count":68,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"e322f49e488fbd91b21506d666af9ecc2b53418567b6140a64b6db5b763cefd1","version":3},{"created_at":"2026-06-19T19:26:05Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"20ac2bd790792366a222e2a2fe2a04f63fab202710663b6cf7c518a421656a9d","version":2},{"created_at":"2026-06-19T19:26:03Z","element_count":88,"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}]}