{"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-nni8xl1d","versions":[{"created_at":"2026-06-10T22:52:48Z","element_count":66,"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":"2b1b081baeca56e8f28834f6f84ec8486347ef164c812c107b25c4fa51ab17ec","version":10},{"created_at":"2026-06-10T16:22:55Z","element_count":73,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"30c5c0843f25e8f6f7ec2d5003ed7d76da5194a3116c2620045989eb4fdd6e6f","version":2}]}