{"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-u8w0xx92","versions":[{"created_at":"2026-06-11T01:38:50Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d16b7afc58f55c7db638321bb595c85d0ac56d588074d18f5416551779bcb440","version":11},{"created_at":"2026-06-10T23:12:08Z","element_count":44,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"623bd486edddf4eca7c6f314e20cf380b4b6ea88fcec205c5311002f99f24efd","version":2}]}