{"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-oom40fhl","versions":[{"created_at":"2026-06-15T19:48:17Z","element_count":70,"note":"5軸GA polish 40->91 by M5 (autonomous)","saved_by":"mcp","sha256":"646420c8facf392a914fa6a674d4839e3a003668eeeeb150fed6f04166631ba6","version":3},{"created_at":"2026-06-15T19:33:34Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0f92d29bc051c64395dca54d1157a77d2a18163a5c8a161023708f45245b84f3","version":2},{"created_at":"2026-06-15T19:33:32Z","element_count":119,"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}]}