{"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-u6fskh6c","versions":[{"created_at":"2026-06-10T22:57:20Z","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":"297839c66da7a2147129920507c0ffe2517066026b75876160da9b290044943a","version":9},{"created_at":"2026-06-10T19:18:55Z","element_count":90,"note":"5軸GA polish 54->95 by M5 (autonomous)","saved_by":"mcp","sha256":"7eff0d672abbde1ef904cf5675fca985eb0648fbe8f64afdd97126019a0c3515","version":2}]}