{"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-a0jc48k8","versions":[{"created_at":"2026-06-10T22:56:55Z","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":"0e5c244579c3979a29e905a0b53a344d8749c719e2e7bdad3f06427c32241702","version":9},{"created_at":"2026-06-10T19:02:38Z","element_count":72,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"15861826c28e55e90b3f87d475c4838e90531f916fdbeb0e10f67cbad98e2430","version":2}]}