{"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-xr9d3l5z","versions":[{"created_at":"2026-06-10T22:54:14Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy64133856→quote21141931 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"25559d81b444785db4454b9fc7472104c5e0ee700b50b2538e5bcf2757317ac7","version":10},{"created_at":"2026-06-10T17:23:25Z","element_count":73,"note":"5軸GA polish 60->93 by M5 (autonomous)","saved_by":"mcp","sha256":"86ce2727dd98ef9510db7f39a7a5708662e60c00188ec201134b28a7682ff376","version":2}]}