{"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-ardennesretreathouse-dofgxga4","versions":[{"created_at":"2026-06-10T22:53:48Z","element_count":66,"note":"legacy fix: jpy85444799→quote21590573 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"f115fea3962a407421ccd78b1503c7591c885afad303e13bac0d1fbee6a5e2eb","version":10},{"created_at":"2026-06-10T17:08:46Z","element_count":73,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9a6633976c4ea2f2cdadd6c0a44ed8be40fff6d86113b2954f5f765b8be55018","version":2}]}