{"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-2xzys3h0","versions":[{"created_at":"2026-06-10T22:53:00Z","element_count":85,"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":"675f7016289eb97e7e2990fc903433ee97e14a7f6e171f9f6b0b854fb053783a","version":10},{"created_at":"2026-06-10T16:39:13Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"bdf58a35e87451adb6a4b35d38ae0e8188fc93c124c742fa255b051334c8d1d8","version":2}]}