{"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-hilltophavenhouse-2q0plpc5","versions":[{"created_at":"2026-06-10T22:53:48Z","element_count":85,"note":"legacy fix: jpy72816480→quote20954809 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"5b2dea06fee70e30316c3a004451d0224392d0c8503dec4243defc8fedd58fca","version":10},{"created_at":"2026-06-10T17:08:52Z","element_count":84,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"82f76e77b11410bc0b874d1ef1a9bb6e898cafeb8077e4b18dca3a626bd15475","version":2}]}