{"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-willowbrookbungalow-68i8v106","versions":[{"created_at":"2026-06-13T17:52:48Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d088e48f9106b6f1e530d1aa238d95da55415bed1b790e0180e3133d3d1c1989","version":3},{"created_at":"2026-06-13T17:39:35Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9f635f1c5ba6ad1e0dcc865f5d255ae96a71bb5b7663a7dae01b51906dfb0dca","version":2},{"created_at":"2026-06-13T17:39:34Z","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}]}