{"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-willowcreekbungalow-o4wz5dh4","versions":[{"created_at":"2026-06-24T00:27:32Z","element_count":52,"note":"5軸GA polish 38->87 by M5 (autonomous)","saved_by":"mcp","sha256":"75707be403b4a8862353f167dd9538d96ea8511935297cb4100e89aab033cd14","version":3},{"created_at":"2026-06-24T00:21:40Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"33c1918303117dfa2251ac348f378e13f83d4603ac880511e76add552cc63d7b","version":2},{"created_at":"2026-06-24T00:21:40Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}