{"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-l83h1izn","versions":[{"created_at":"2026-06-10T23:00:20Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy85444799→quote21093533 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"ea1395ff8a45003542583dd2771a82914475a7c5e376a1c5e81f84cc5e6d1401","version":9},{"created_at":"2026-06-10T21:11:20Z","element_count":74,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d2e886009c22e3827621eebcc04b74f7cb62b7ec500d64dbc075e771540fff0a","version":3}]}