{"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-whpvd7vz","versions":[{"created_at":"2026-06-10T22:57:06Z","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":"c4162daec3a19ef5b6fee7747d3cd78debd5060ca7e09a05a939c3d06dddbf1f","version":9},{"created_at":"2026-06-10T19:02:38Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"96936d118f4368e9c37d6c3bb2b3075384438c75a5b93e0ad17ac1ed92b50f83","version":2}]}