{"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-jbvlrsrj","versions":[{"created_at":"2026-06-10T22:52:51Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"23acf0a361f36cba5c897c4c08e33052c815882fa2898ab6c7d33b44caa0230e","version":10},{"created_at":"2026-06-10T16:39:08Z","element_count":89,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"ad073eaeca4e6da722938612fde1567a32bf75ed39b32aac1bfdd19058647b55","version":2}]}