{"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-7g5juvwa","versions":[{"created_at":"2026-06-10T22:58:41Z","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":"92d4d99371cf775951fbf3dcf5345ae4709d6814dd9ba13a8760c2b5fb9669f4","version":9},{"created_at":"2026-06-10T20:07:31Z","element_count":89,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ee521a54ea59997409dcf670a923d538c16d204d0040a4c8d4e67c223493d32f","version":2}]}