{"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-hdh1xt3d","versions":[{"created_at":"2026-06-10T22:58:50Z","element_count":66,"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":"443c2cd513351452cd60e27f1dccbab6df8ce5c59ef8c3c55644f4106149fa7c","version":9},{"created_at":"2026-06-10T20:22:38Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"213faf4b8d4f0e9848163ee63cbd5929b6839ac8a1fcf855742308d663ebc62f","version":2}]}