{"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-mp94qojv","versions":[{"created_at":"2026-06-10T22:57:02Z","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":"1785cee66514a2b460c1099497fbc2a2be8c123ec8dc42e9ffb89091a0d521fb","version":9},{"created_at":"2026-06-10T19:02:38Z","element_count":84,"note":"5軸GA polish 56->95 by M5 (autonomous)","saved_by":"mcp","sha256":"9b4fabfef588e47d18917f9ea17623094ea5cb73843014f1fab3697d54b05ea3","version":2}]}