{"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-b8qj4qjz","versions":[{"created_at":"2026-06-10T23:00:10Z","element_count":63,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote20998412 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"5b0288e189cdf19f534bdd996a5c1c0ab5f06004c7f70613fdc84ad34271988c","version":9},{"created_at":"2026-06-10T21:11:35Z","element_count":85,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"819c7c20c0ddca86034f39041e423846d8b459b468f36d3d2d96d57447fc12bb","version":3}]}