{"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-5r8na7lh","versions":[{"created_at":"2026-06-30T06:19:44Z","element_count":83,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"5a5bc28fa4ad73545612ac075a4fcd86ad8893dabf85238732aee10f7a1507b2","version":3},{"created_at":"2026-06-30T06:16:15Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"721fa2209213edb6ee878bec5ca1dfc83022bb75103f82e4289056a22cea679f","version":2},{"created_at":"2026-06-30T06:16:15Z","element_count":101,"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}]}