{"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-nptw3o1t","versions":[{"created_at":"2026-06-10T22:57:53Z","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":9},{"created_at":"2026-06-10T19:51:06Z","element_count":90,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"546ab1ef51fd1d450842adb22138718e0cfba5034e4ddfc04e20c3ffaf385cdd","version":2}]}