{"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-wblu9sbw","versions":[{"created_at":"2026-06-30T19:50:49Z","element_count":72,"note":"5軸GA polish 41->92 by M5 (autonomous)","saved_by":"mcp","sha256":"8d1e0a4713f1ca6d84bf918d90359c526767192b686035e9806c4b7c951fedc8","version":3},{"created_at":"2026-06-30T19:41:38Z","element_count":82,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0d1e6869271117f3e8025c34123b473d39f73f0afd8f3da40d4eb26030fb9354","version":2},{"created_at":"2026-06-30T19:41:38Z","element_count":82,"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}]}