{"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-wr3wp2vg","versions":[{"created_at":"2026-06-10T13:44:08Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"0e8aab3e69ffe9769b598f560f947e64919c117451c9d1fc645b16b7fe01b72d","version":7},{"created_at":"2026-06-10T13:21:38Z","element_count":72,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"40fcf23793b1d02e62f621f52cf622d8db4f96df01a151b4f249754cfa102268","version":4}]}