{"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-msdxx1my","versions":[{"created_at":"2026-06-10T22:57:38Z","element_count":62,"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":"86dc06f977be3b5f65410970aa2cb4e55e415f191335f751125efb32bb21ab5a","version":9},{"created_at":"2026-06-10T19:34:24Z","element_count":69,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"839d45c82746e0eee1871d66f30cef1c3988779f65a89e2a9693205fb16fe8ea","version":2}]}