{"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-hilltophouse-hukzidc2","versions":[{"created_at":"2026-06-10T22:53:46Z","element_count":63,"note":"legacy fix: jpy102533759→quote20826055 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"f437414741516d9f4051f6030c11ae3c9e472ed03f1fa60b502a9e286ee929d1","version":10},{"created_at":"2026-06-10T17:08:50Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"929eb114735fede093d9cdf5227895c41fb4a23e7875964969226f17843fcf7a","version":2}]}