{"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-uq83a5eu","versions":[{"created_at":"2026-06-10T22:59:06Z","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":"2ebfae5547939f58134d6781445c6957f05535767fa77436fe6f8d0c4ffb76bf","version":9},{"created_at":"2026-06-10T20:22:38Z","element_count":73,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"d07e05e17666285fa34af75faf59582d56d3f1caaede4d2838c22446813ff23f","version":2}]}