{"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-3vvh5lww","versions":[{"created_at":"2026-06-10T22:57:43Z","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":"2026-06-10T19:34:23Z","element_count":69,"note":"5軸GA polish 58->93 by M5 (autonomous)","saved_by":"mcp","sha256":"77ae9c2d8f4c3bca476d6506f0be275b6015e0abb13976e638000af302a27497","version":2}]}