{"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-q9md2p5g","versions":[{"created_at":"2026-06-10T22:59:05Z","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":"c2bd2242e265305bd9a71be0b4d682d8d3433f11f035bc1d056ef8eba0536a9e","version":9},{"created_at":"2026-06-10T20:22:40Z","element_count":91,"note":"5軸GA polish 56->96 by M5 (autonomous)","saved_by":"mcp","sha256":"72e1337468d80a193bceaf17defbab6d3050d158313093928a7b4568c73be0d9","version":2}]}