{"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-0he5mduo","versions":[{"created_at":"2026-06-20T19:43:14Z","element_count":71,"note":"5軸GA polish 38->91 by M5 (autonomous)","saved_by":"mcp","sha256":"3fbf10b3f6ecf061bb6eaab59464d9fc087438bc41f7e633761b60e5fec80688","version":3},{"created_at":"2026-06-20T19:35:31Z","element_count":85,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e43970e3b71a0b40734b8386d973f629652d27ea6d4ac326850e9db051b0309e","version":2},{"created_at":"2026-06-20T19:35:30Z","element_count":85,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}