{"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-m4wmdxzo","versions":[{"created_at":"2026-06-10T22:59:11Z","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":"9aaa1bda841873bd5a54b7c8a366919cef19741b1ac6752a2c0a8754fb61aab7","version":9},{"created_at":"2026-06-10T20:38:24Z","element_count":84,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5979666ce03227c4b28f02bcfbda02bdc83b700c4a494ea4300aef0d16158596","version":2}]}