{"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-bptc6tbl","versions":[{"created_at":"2026-06-10T13:34:25Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積103.4㎡(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":"9278b4103a7f3b40c9ae3149e62c1ffd12ad70cd9db2d1fff6308a4368b56a25","version":7},{"created_at":"2026-06-10T12:48:46Z","element_count":82,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"dfac437f3d4c38ec4c13be543c626e66cf6b35b481be56ed7710592ac0ede19e","version":4}]}