{"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-4as7e1s0","versions":[{"created_at":"2026-06-10T22:52:37Z","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":"086070b8ce12e60bb48a5a5732a19b473f989beb7a365ae9cebc537b2f5b49e3","version":18},{"created_at":"2026-06-10T14:12:55Z","element_count":84,"note":"5軸GA polish 63->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7ed284765a57b5998ae762e0d56cc67e03a7b9feac63ef0fef93c4a38db578f3","version":7},{"created_at":"2026-06-10T13:47:52Z","element_count":54,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"073c73d1a1fbeef0e84c39281db33253b37888062392c9c89ec4c46ae602b5b4","version":4}]}