{"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-willowcreekhouse-3qm9pix1","versions":[{"created_at":"2026-06-10T22:53:55Z","element_count":63,"note":"legacy fix: jpy75041820→quote22834440 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"73efd8f6c48c2d6ffb28494ae7c376e7c976f6079de64c4fb1aa45f2b2d39706","version":10},{"created_at":"2026-06-10T17:23:13Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c7ce4e7801d7746d775507c0925574b9473afea9e5df2b1cc6063982eacab863","version":2}]}