{"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-jqmzrwga","versions":[{"created_at":"2026-06-10T22:58:42Z","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":"2026-06-10T20:07:25Z","element_count":89,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"a92077840d7349cef839d80756833c0804138f960ae20ba964514ad37bc7f28e","version":2}]}