{"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-zl052cbi","versions":[{"created_at":"2026-06-10T22:52:48Z","element_count":63,"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":"e386f9dafb84489d3b8d232be65c11006c8b7e150eda9fe55bfd33c9a14e267a","version":10},{"created_at":"2026-06-10T16:23:36Z","element_count":84,"note":"5軸GA polish 56->95 by M5 (autonomous)","saved_by":"mcp","sha256":"9fdb4cfeaacb849725761e38fecee2976affe0e623f319bc6c0008d1dceb7784","version":2}]}