{"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-21xyz8tz","versions":[{"created_at":"2026-06-10T22:49:43Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy70091322→quote19626413 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"0e3877c33a7894e51c01265457366f67d55af66039bf2185eeff0b8190a66231","version":25},{"created_at":"2026-06-10T13:07:36Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"fda8e0844e872ee07a1763d9bb656605fd2752f99a1b6786c582806b2ca1ef71","version":11},{"created_at":"2026-06-10T07:25:54Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ac3cde25579e51ba6e63392c702085f8b1b2d6401640a04c8c2cbb7732ed7201","version":2}]}