{"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-uit7gg7o","versions":[{"created_at":"2026-06-10T22:01:57Z","element_count":54,"note":"revert: houki rescan NG -> restore pre-polish elements (M5 2026-06-11)","saved_by":"mcp","sha256":"989f52615993acee263d39043971d00bb7c974dde0bfb50028dde5beb58eb4e3","version":5},{"created_at":"2026-06-10T18:13:39Z","element_count":71,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"fbf7e37fe3a62dd78b8a8900f10ed2d3fdd3e84e4e0dff92420a44d28463f8cd","version":3}]}