{"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-un4rdwxv","versions":[{"created_at":"2026-06-10T22:54:10Z","element_count":85,"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":"b8f90a4e803a0ab45f719c8f926226fc75f5d04e77fc4eeafde59c4583439333","version":10},{"created_at":"2026-06-10T17:23:23Z","element_count":91,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"4da831b69f66c9db9443449b0885523ffbac3baee31ec2f6efe95834dcfaa46b","version":2}]}