{"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-66t9jrm3","versions":[{"created_at":"2026-06-10T22:58:24Z","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":"e8a68fa983f4fcf6c20d8a10b367b8ccc39f6871ddc65da4e00860800b9bf652","version":9},{"created_at":"2026-06-10T20:07:23Z","element_count":84,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"288b1149f1cbcf2db111bc8c4ce93cb04bf6c7553514d8f8d6a08383afef180a","version":2}]}