{"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-z28ggdxf","versions":[{"created_at":"2026-06-10T22:58:01Z","element_count":66,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy90050184→quote21228016 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"ae2d0848c827793bb0054ee589c3fc5070e474dbde7e952ef4a77c37a51cc71c","version":9},{"created_at":"2026-06-10T19:50:34Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"14b610871379661980621e903e0238bdff9deafbfcac2aaa5bf5996b10f9fb45","version":2}]}