{"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-stonebridgebungalow-wihwigv5","versions":[{"created_at":"2026-08-17T21:22:23Z","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":"564ec75fe23ab3c86e850ca4577f255c21d5614dfdefe48648e8fb5bd167dd26","version":2},{"created_at":"2026-08-17T21:22:22Z","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}]}