{"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-theoldmillhouse-h0m54btk","versions":[{"created_at":"2026-06-13T18:48:55Z","element_count":85,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"21fc519acae3264ab0194f3e41c883c102ea13586705d41ffbbd285481696892","version":3},{"created_at":"2026-06-13T18:41:42Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9d6db56a1fdbb129b6e4d0e97b12d750a0e2594810b70d803c25029c9a1cd591","version":2},{"created_at":"2026-06-13T18:41:40Z","element_count":89,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}