{"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-fzit9xq8","versions":[{"created_at":"2026-06-10T13:14:47Z","element_count":62,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"e01dcffdb5434775ae649135df059230210c1b5aae118bb1c305833d5ccf1cc9","version":10},{"created_at":"2026-06-10T09:21:29Z","element_count":84,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ae757a9bf9ffbd04d7a5ed10ee4a00b4f50a40cfb0de28ee5bceae1ab2bb8e60","version":2}]}