{"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-vqcq5m12","versions":[{"created_at":"2026-07-24T19:24:30Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d664ce2a704fdebd55931e7be9122ed204a097d4f25fdc0a7fd553cbfe44c50e","version":2},{"created_at":"2026-07-24T19:24:30Z","element_count":107,"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}]}