{"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-5ejp6z74","versions":[{"created_at":"2026-07-17T19:41:14Z","element_count":83,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"4b09039cd9ab619ae7a3296b9edf4600f87ba2add61d33a7ca7c8ff5029bc95b","version":3},{"created_at":"2026-07-17T19:32:13Z","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":"9d4e8ece51d57d158f3748aafc70a1d7fa2e3452ebc2aaf94b67dc5776898989","version":2},{"created_at":"2026-07-17T19:32:10Z","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}]}