{"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-xa9xzpsz","versions":[{"created_at":"2026-06-10T22:52:26Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy75041820→quote18693989 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"91774b3ab4afa4808e34775d37db9ec0f96d4c5abab438c4947d408add00253d","version":21},{"created_at":"2026-06-10T13:31:50Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"725b72b44387680d16a70c0333f8243d580b49dc1cc90c202a9c15802f0d345d","version":7},{"created_at":"2026-06-10T12:16:04Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c9e034cc102a25dedc9c01eac61e848237247cd9c4f315bf2962484cc965e031","version":3}]}