{"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-xlyyi61q","versions":[{"created_at":"2026-06-10T22:58:43Z","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":"77f7b9fa9e842b7691464d1272372dc84eaedb97aab0675e3ff849562a3e821c","version":9},{"created_at":"2026-06-10T20:07:33Z","element_count":84,"note":"5軸GA polish 58->96 by M5 (autonomous)","saved_by":"mcp","sha256":"696f4022a689bca92243d1e11ab1946510aace4b79f36f67dab38eac594a3ea7","version":2}]}