{"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-1y10wdt7","versions":[{"created_at":"2026-06-10T22:52:48Z","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":"255b962b00a1f8039ab134da616382d6493af67a396410e58ce760b1fe0d737f","version":10},{"created_at":"2026-06-10T16:23:12Z","element_count":91,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"87b2695a6d6b1532a3e5f5411b3d87e9ec7d9a64d9a32c591b94ee67b73b8fd6","version":2}]}