{"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-u094hbma","versions":[{"created_at":"2026-06-10T13:25:28Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.0㎡(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":"22afab92bdfc9941edbea7a460314cfa1a1bf6f3ce85556c5848180c19ac37ed","version":11},{"created_at":"2026-06-10T11:09:54Z","element_count":73,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9a6633976c4ea2f2cdadd6c0a44ed8be40fff6d86113b2954f5f765b8be55018","version":4}]}