{"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-theardenhouse-id8etp3m","versions":[{"created_at":"2026-06-10T13:23:23Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"b663a9ddc809097fec5c82d3c11646dc782da12bff08bcb63f4206c12b4beda3","version":10},{"created_at":"2026-06-10T10:37:38Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4d5cd88cf12a79b4251d9873de7f57a4c52473a6445b9e1a6a13d97bb5a7c6ed","version":2}]}