{"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-kokdkhax","versions":[{"created_at":"2026-06-11T03:57:13Z","element_count":84,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9e59a12c8716a2a84a2d8105760ee4ee98840a36fa642663d3b5ed54e7a7efed","version":3},{"created_at":"2026-06-11T03:48:36Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9ad9df20aec6b21e719c6380ab5f02dcff20007a973087129325486a942c6341","version":2}]}