{"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-gp4r8hai","versions":[{"created_at":"2026-06-10T22:59:38Z","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":"2026-06-10T20:38:18Z","element_count":83,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"47a63ac1feb2104762028a3d4eab594f89fe461c144debd066d91cd0d72bc05e","version":2}]}