{"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-8a2zna0j","versions":[{"created_at":"2026-06-10T22:53:07Z","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":"55859f5f032bbc19ca05d423ed60fc16fe955174ddafccdc479a18af292a5221","version":10},{"created_at":"2026-06-10T16:40:26Z","element_count":90,"note":"5軸GA polish 54->96 by M5 (autonomous)","saved_by":"mcp","sha256":"f349a926e240d67af68d0ff06985281b66572fc1b7f7ef8ddc2782b1a1e41d4a","version":2}]}