{"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-04lbsd73","versions":[{"created_at":"2026-07-22T02:15:41Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5d529f2995a933dc77330f4e416909146c4aa12a6a798cd926e16f63507c1db7","version":2},{"created_at":"2026-07-22T02:15:38Z","element_count":85,"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}]}