{"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-2cbs2c3u","versions":[{"created_at":"2026-06-10T22:52:47Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy102533759→quote20821160 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"fcb329e2c654cf6a73271c74f7c4b87f0cb842af0c0ba192c403a236831bce10","version":11},{"created_at":"2026-06-10T16:08:49Z","element_count":72,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"fd20711622a1d0fdca724bed3369df10d29784b2a2e75c2f51f2929d9bc1c883","version":3}]}