{"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-willowbrookhouse-xn1zdiyw","versions":[{"created_at":"2026-07-03T14:28:13Z","element_count":84,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"ee707be9c022d5fb13dd622080e6e5aea58e7c30bad51a3e8604dbd0fcf4b0dc","version":3},{"created_at":"2026-07-03T14:16:31Z","element_count":86,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"284a7f357ae6224e6f4dccfce39c2452d682b9c78a7febf7a7a0dfec8fcd8e10","version":2},{"created_at":"2026-07-03T14:16:31Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}