{"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-fk9770b1","versions":[{"created_at":"2026-06-10T22:52:47Z","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":"0ec9fbe5fc761f1dfd8cbd3c960f99da97c53c3c3f497a339c80cab5f01eec50","version":10},{"created_at":"2026-06-10T16:08:46Z","element_count":90,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"74a5676d255344672e939d332d509bdd6954362802e25f96be99da2c56e0cedd","version":2}]}