{"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-jbb8czx5","versions":[{"created_at":"2026-06-10T22:52:49Z","element_count":77,"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":"5d4ea616a110a86955bf5d06e934285fe1e83c1a6eb39518959e3ea62e423416","version":10},{"created_at":"2026-06-10T16:39:38Z","element_count":83,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"f16693657a4500e73e24925ee923919a8b3631876a9bc88945d8484fdbcc3907","version":2}]}